LPRS Data Sheet
Easy-Radio ‘02’ (2nd Generation Modules)
ER400TS Transmitter, ER400RS Receiver & ER400TRS Transceiver
ER900TS Transmitter, ER900RS Receiver & ER900TRS Transceiver
Low Power Radio
Solutions Ltd
“ERx00-02 Series Data Sheet (Rev 2.5).pdf”
Modules Included:
• ER400TS-02
• ER400RS-02
• ER400TRS-02
• ER900TS-02
• ER900RS-02
• ER900TRS-02
ERx00-02 Series V2.5.doc
Datasheet Revision 2.5 September 2008
Copyright LPRS 2008
.
Page 1 of 31
LPRS Data Sheet
Easy-Radio ‘02’ (2nd Generation Modules)
ER400TS Transmitter, ER400RS Receiver & ER400TRS Transceiver
ER900TS Transmitter, ER900RS Receiver & ER900TRS Transceiver
Contents
Contents.................................................................................................................................2
Changes to this Document.....................................................................................................3
Disclaimer...............................................................................................................................3
Introduction to easyRadio......................................................................................................4
New ‘02’ Added Features..................................................................................................5
ERx00TS-02 Transmitter.......................................................................................................6
Pin Description..................................................................................................................6
ERx00RS Receiver................................................................................................................7
Pin Out...............................................................................................................................7
Pin Description..................................................................................................................8
Application & Operation ERx00TS-02 & RS-02.....................................................................9
ERx00TRS-02 Transceiver Description...............................................................................10
Pin Description................................................................................................................11
Application & Operation ERx00TRS-02...............................................................................12
Absolute Maximum Ratings ERx00TS-02, ERx00RS-02 and ERx00TRS-02.....................13
Easy-Radio Configuration Command Set............................................................................16
Notes:...................................................................................................................................20
RSSI Output....................................................................................................................20
Application Notes.............................................................................................................20
Compatibility....................................................................................................................20
PCB Layout.....................................................................................................................21
Power Supply..................................................................................................................21
Antennas.........................................................................................................................21
IMPORTANT NOTE REGARDING ESD ON ANTENNA.....................................................21
Technical Characteristics.....................................................................................................22
easyRadio errata notes:.......................................................................................................23
ISSUE1............................................................................................................................23
ISSUE2............................................................................................................................23
ISSUE 3...........................................................................................................................24
ISSUE 4...........................................................................................................................24
Product Order Codes...........................................................................................................25
Easy-Radio Module Firmware Version................................................................................25
Document History.................................................................................................................26
Copyright..............................................................................................................................26
Certificates of Conformance to EN300-220 Part3...............................................................27
ER400TS-02 and ER900TS-02....................................................................................28
ER400RS-02 and ER900RS-02...................................................................................29
ER400TRS-02 and ER900TRS-02
..........................................................................................................................................30
Disclaimer.............................................................................................................................31
CONTACT INFORMATION.................................................................................................31
ERx00-02 Series V2.5.doc
Datasheet Revision 2.5 September 2008
Copyright LPRS 2008
.
Page 2 of 31
LPRS Data Sheet
Easy-Radio ‘02’ (2nd Generation Modules)
ER400TS Transmitter, ER400RS Receiver & ER400TRS Transceiver
ER900TS Transmitter, ER900RS Receiver & ER900TRS Transceiver
Changes to this Document
This data sheet has been updated to reflect firmware changes throughout the range of modules. Specific
alterations are recorded in the documentation history later in the document.
Disclaimer
Low Power Radio Solutions Ltd has an on going policy to improve the performance and reliability of their
products; we therefore reserve the right to make changes without notice. The information contained in this
data sheet is believed to be accurate however we do not assume any responsibility for errors or any liability
arising from the application or use of any product or circuit described herein. This data sheet neither states
nor implies warranty of any kind, including fitness for any particular application.
EasyRadio modules are a component part of an end system product and should be treated as such. Testing
to fitness is the sole responsibility of the manufacturer of the device into which easyRadio products are fitted,
as is also the deployment into the field.
Any liability from defect or malfunction is limited to the replacement of product ONLY, and does not
include labour or other incurred corrective expenses.
Using or continuing to use these devices hereby binds the user to these terms.
ERx00-02 Series V2.5.doc
Datasheet Revision 2.5 September 2008
Copyright LPRS 2008
.
Page 3 of 31
LPRS Data Sheet
Easy-Radio ‘02’ (2nd Generation Modules)
ER400TS Transmitter, ER400RS Receiver & ER400TRS Transceiver
ER900TS Transmitter, ER900RS Receiver & ER900TRS Transceiver
Introduction to easyRadio
The easyRadio (ER) ERx00TS Transmitter, ERx00RS Receiver and ERx00TRS transceiver incorporate
‘easyRadio’ technology to provide high performance, simple to use radio devices that can transfer data over
a range of up to 250 metres Line Of Sight (LOS). Furthermore ‘Easy-Radio’ technology allows frequency,
data rate and power output to be optimised for customer specific applications. The embedded software
reduces design and development time significantly.
ER modules are available in two frequency versions: ER400 series (433-434MHz) & ER900 series
(869.85MHz & 902-928MHz). For purposes in this document they will be referred to as ERx00.
2nd Generation Modules (please READ)
This Data Sheet covers the new hardware/firmware revisions of the Easy Radio TS, RS & TRS modules.
Their Part numbers are the same as before with the addition of “-02” (eg. ER400TRS-02).
The “02” modules address issues that have been identified in previous hardware. The primary objectives for
its development was to solve two main issues:
• Unintentional Loss of user configured settings:
o The previously used micro-controller (µC) was susceptible to EEPROM corruption when a
‘brown-out’ condition occurred. Particularly when power cycling the module. This had the
effect of triggering the automatic Reset to Default behaviour of the module.
• Frequency Stability:
o Previous data sheets clearly show a frequency tolerance of +-50ppm. Despite operating
within this specification, over some batches of product this has caused some unreliable
communication to occur, as frequencies have been too far away from each other. If you are
having issues in this area, please contact us.
• Back Compatibility:
o New Modules can be set to be compatible with any frequency variations in the past. Please
contact technical for details or consult evaluation software help file.
What improvements are there in ‘02’?
1. The µC has now been changed to one which also has a low-voltage brown-out-detect (BOD) circuit
built in. Extensive testing has been done on this, and therefore power cycling techniques to conserve
power are now easily achieved without the loss of programmed settings. The new µC also benefits
from greater ROM size and peripheral features which means more functionality is being packed into
the Easy Radio Modules.
2. The Crystal that controls the RF is now as low as +-10ppm, which guarantees consistent frequency
stability over batches and over an extended temperature range of –40°C to +85°C.
Of course some specifications have been effected to allow these hardware changes, but we feel it has been
a necessary move to improve the product. LPRS are committed to the continued development and
enhancement of Easy Radio and enhancements may be made without prior notice. A list of development
hardware and software known issues and changes are listed at the end of this document. Please always
make sure you are reading the latest document for update information.
This data sheet describes the electrical and physical characteristics of the device. Operation of the Easy
Radio software and Timing Specifications are described later in this document.
General Features
Applications
Crystal controlled synthesiser for frequency accuracy
High sensitivity receiver – typically –103dBm @ 19.2 Kbps
Up to 10mW Transmit Power (at 434MHz)
Low operating Voltage – 2.5-5.5 Volts – Single Lithium Cell
Low power consumption:
Receiver - 21mA
Transmitter - 25mA
Sleep – 120µA (V2.01.6 + later)
User programmable:
Frequency of operation
Data Rate
Output Power
Handheld Terminals
Environmental Sense & Control
Vehicle to Base Station Data Transfer
Remote Data Acquisition
Electronic Point of Sale equipment
Etc
ERx00-02 Series V2.5.doc
Datasheet Revision 2.5 September 2008
Copyright LPRS 2008
.
Page 4 of 31
LPRS Data Sheet
Easy-Radio ‘02’ (2nd Generation Modules)
ER400TS Transmitter, ER400RS Receiver & ER400TRS Transceiver
ER900TS Transmitter, ER900RS Receiver & ER900TRS Transceiver
New ‘02’ Added Features
•
•
•
•
•
•
•
•
•
•
User Customisable RS232 BAUD rate
o Literally add any required BAUD rate in the new Easy Radio Evaluation Software and select your
new BAUD using the new ER_CMD#U0 command. *
RS232 Parity **
o Odd/even parity is supported**
FAST ACK feature
o Reduce the time to issue ‘ER’ commands, using the HEX06 ASCII ACK character.
Default Power Settings
o Set your own power defaults for each channel using lowercase ‘p’ command.
Customisable Data ID **
o Set a 16-bit ID to prevent communication with other Easy Radio Users.
Programmable Encryption **
o Secure your data with a user defined 16-bit seed.
User programmable frequencies
o Change the channel frequencies to personalised settings. (Via PC Software)
DCS (Digital Channel Selection)
o Prevent crosstalk between adjacent channels
Repeater Mode **
o Extend transmission range
16-bit CRC **
o Increased error checking
*
Note some BAUD rates may require two stop bits. (See Evaluation Software for details on
specific BAUD)
**
Available on firmware versions 2.01.6 and above
ERx00-02 Series V2.5.doc
Datasheet Revision 2.5 September 2008
Copyright LPRS 2008
.
Page 5 of 31
Easy-Radio ‘02’ (2nd Generation Modules)
ER400TS Transmitter, ER400RS Receiver & ER400TRS Transceiver
ER900TS Transmitter, ER900RS Receiver & ER900TRS Transceiver
LPRS Data Sheet
ERx00TS-02 Transmitter
Antenna (2)
Regulator
Vcc (3)
Micro
Processor
TXD (5)
RF Transmitter
RF Gnd (1)
Gnd (4)
Figure 1 Block Diagram
4 mm
31.0mm
Top View
(Transmitter)
12 mm
20.32mm
1 2
3 4 5
Pin Pitch 2.54 mm PCB Hole Size 1.0 mm
Figure 2 Physical Dimensions
Pin Description
Pin
No
Name
Description
Notes
1
RF Gnd
2
3
RF Out
Vcc
4
5
Gnd
TXD
RF ground. Connect to antenna ground (coaxial cable screen
braid) and local ground plane. Internally connected to Pin 4
50Ω RF output. Connect to suitable antenna
Positive supply pin. +2.5 to +5.5 Volts. This should be a
‘clean’ noise free supply with less than 25mV of ripple
Supply 0 Volt and Ground Plane
Transmit Data Digital Input (SDI)
Notes
1. The module operates internally from an on board 3.3 Volt low drop regulator.
2. TXD input will be correctly driven by logic operating at 5 Volts (CMOS & TTL logic levels). Input
should not be driven by an analogue source.
ERx00-02 Series V2.5.doc
Datasheet Revision 2.5 September 2008
Copyright LPRS 2008
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Page 6 of 31
Easy-Radio ‘02’ (2nd Generation Modules)
ER400TS Transmitter, ER400RS Receiver & ER400TRS Transceiver
ER900TS Transmitter, ER900RS Receiver & ER900TRS Transceiver
LPRS Data Sheet
ERx00RS Receiver
The ERx00RS-02 Receiver is a complete sub-system that combines a high performance low power RF
receiver, a ‘flash’ programmable microcontroller and a voltage regulator (Figure 3). The microcontroller
programmes the functions of the RF receiver and provides the interface to the host system via a data output.
It also contains programmable EEPROM memory that holds configuration data for the various receiveroperating modes. The microcontroller also relieves the host from the intensive demands of searching for
signals within the noise, recovering the received data and then presenting it to the host. A Received Signal
Strength Indicator output can be optionally used to measure received signal levels. The module connects to
a 50Ω antenna such as a whip, helical or PCB loop.
Antenna (1)
RSSI Output (3)
Vcc (8)
Regulator
RF Receiver
BSY (4)
Micro
Processor
Serial Data Output (5)
Serial Data Input (6)
RDY (7)
Ground (9)
RF Ground (2)
Figure 3 Easy-Radio Receiver Block Diagram
The ERx00RS-02 will receive and decode any Easy-Radio transmission within range and on the same
frequency and deliver clean RS232 data to the host system for further processing.
The Serial Data Output operates at programmable standard Baud Rates (default/typical 19,200Baud).
Key parameters (frequency, power output, serial baud rate etc.) of the module may be programmed using
the Easy-Radio PC Software via SDI pin 6. (Easy Radio Configuration Command Set, later in this document)
Pin Out
4.0mm
38.0 mm
Top View
(Receiver)
14.0mm
10.0mm
15.0 mm
1 2
3 4 5 6 7 8 9
Pin Pitch 2.54 mm PCB Hole Size 1.0 mm
Figure 4 Physical Dimensions
ERx00-02 Series V2.5.doc
Datasheet Revision 2.5 September 2008
Copyright LPRS 2008
.
Page 7 of 31
LPRS Data Sheet
Easy-Radio ‘02’ (2nd Generation Modules)
ER400TS Transmitter, ER400RS Receiver & ER400TRS Transceiver
ER900TS Transmitter, ER900RS Receiver & ER900TRS Transceiver
Pin Description
Pin
No
Name
Description
Notes
1
2
Antenna
RF Ground
3
4
5
6
7
8
RSSI
BSY
Data Out
Data In
RDY
Vcc
9
Ground
50Ω RF input/output. Connect to suitable antenna.
RF ground. Connect to antenna ground (coaxial cable screen
braid) and local ground plane. Internally connected to other
Ground pins.
Received Signal Strength Indication - Analogue
Output (Low - Ready for data from Host) (High - Not Ready)
Received Data Output
ER command Input
Input (Low – Host Ready to receive data) (High – Not Ready)
Positive supply pin. +2.5 to +5.5 Volts. This should be a
‘clean’ noise free supply with less than 25mV of ripple.
Connect to supply 0 Volt and ground plane
CTS function
SDO
SDI
RTS function
Checklist
1. The module operates internally from an on board 3.3 Volt low drop regulator. The logic levels of the
input/output pins are therefore between 0 Volt and 3.3 Volts. (See RS Performance Data).
2. All digital inputs and outputs are intended for connection to low voltage logic devices. Do not connect
any of the inputs or outputs directly to an RS232 port. The receiver module may be permanently
damaged by the voltages (+/- 12V) present on RS232 signal lines. See Application Circuit (Figure
11) for typical connection to an RS232 port via MAX232 interface IC.
3. Outputs will drive logic operating at 5 Volts provided the switching levels are less than 3V.
4. If in handshaking mode, pin (7) of the ERx00RS-02 module should be 0V for data to be delivered.
5. Fit 1K resistors in series with data lines if connecting to 5V logic.
ERx00-02 Series V2.5.doc
Datasheet Revision 2.5 September 2008
Copyright LPRS 2008
.
Page 8 of 31
LPRS Data Sheet
Easy-Radio ‘02’ (2nd Generation Modules)
ER400TS Transmitter, ER400RS Receiver & ER400TRS Transceiver
ER900TS Transmitter, ER900RS Receiver & ER900TRS Transceiver
Application & Operation ERx00TS-02 & RS-02
Figure 5 shows a typical system block diagram comprising hosts (user’s application) connected to EasyRadio Transmitters and Receivers. Host (A) will be monitoring (collecting data) and Host (B) will be receiving
and processing this data.
Transmit Data (TXD)
Host
(A)
Receive Data Output
RF Link
Easy-Radio
Transmitter
Easy-Radio
Receiver
Host
(B)
Figure 5 Typical System Block Diagram
The Host (A) should provide the serial data input (up to a maximum 180 characters per packet) to the EasyRadio transmitter. The data should be sent in ‘bursts’ therefore allowing adequate time for transmission and
reception over the RF link (See Figure 6). The receiver, upon reception and decoding of the RF transmission
immediately sends serial data to the Host B.
Data is sent and received in standard ‘RS232’ serial format (logic level only) and there is no restriction on the
characters that may be sent. (HEX 00 – FF)
A. Host (A) sends serial data to the Easy-Radio Transmitter (A). The data must be continuously
streamed at the selected baud rate and it loads an internal transmit buffer until either it is full or a
gap of two bytes is detected.
B. After detecting either the ‘End of Data’ gap or the ‘Buffer Full’ condition the controller enables RF
transmit and sends the data in the buffer using Manchester coding for efficient transmission across
the RF link. Any Easy-Radio receivers within range that ‘hear’ the transmission will simultaneously
decode the data and place it into their receive buffers.
C. After checking the data for integrity, the Data within the receive buffer of Easy-Radio Receiver (B) is
then sent continuously to the host at the selected baud rate.
There is no ‘RF handshaking’ provided at either the transmitter or receiver. The user should therefore ensure
that sufficient time is allowed for the completion of transmission and reception of data. The Timing
Specifications detail these requirements (see page 9). Transmitter Host (A) must allow time for the ‘Over Air’
transmission and for the receiving Host (B) to unload (and process) the data before sending any more new
data. The receiver Host (B) must always be ‘ready and waiting’ for data to arrive. It should be possible to use
fast response ‘interrupts’ without any loss of data.
With such a ‘one-way’ (simplex) system there is no confirmation of the satisfactory reception of the data and
for added reliability it is recommended that the data be sent, perhaps, repetitively several times. For
increased reliability the use of transceivers (which can acknowledge packet reception) is recommended.
Easy-Radio services do not provide automatic acknowledgement (or re-tries) but these can be provided by
the users application.
A
Host (A) sends serial data to Easy-Radio (A)
Two Byte Delay for 'End of Data'
B
Easy-Radio (A) Encodes data then Transmits
Over Air
Easy-Radio (B) Receives & Decodes
C
Easy-Radio (B) sends serial data to Host (B)
Figure 6 Serial Data
ERx00-02 Series V2.5.doc
Datasheet Revision 2.5 September 2008
Copyright LPRS 2008
.
Page 9 of 31
Easy-Radio ‘02’ (2nd Generation Modules)
ER400TS Transmitter, ER400RS Receiver & ER400TRS Transceiver
ER900TS Transmitter, ER900RS Receiver & ER900TRS Transceiver
LPRS Data Sheet
ERx00TRS-02 Transceiver Description
The Easy-Radio Transceiver is a complete sub-system that combines a high performance very low power RF
transceiver, a microcontroller and a voltage regulator (Figure 7).
.
Antenna (1)
RSSI Output (3)
Vcc (8)
Regulator
RF Transceiver
BSY (4)
Micro
Processor
Serial Data Output (5)
Serial Data Input (6)
RDY (7)
Ground (9)
RF Ground (2)
Figure 7 Easy-Radio Transceiver Block Diagram
The Serial Data Input and Serial Data Output operate at the standard 19,200 Baud and the two handshake
lines provide optional flow control to and from the host. The Easy-Radio Transceiver can accept and transmit
up to 180 bytes of data, which it buffers internally before transmitting in an efficient over-air code format.
Any other Easy-Radio Transceiver within range that ‘hears’ the transmission will decode the message and
place the recovered data within a receive buffer that can then be unloaded to the receiving host for
processing and interpretation. Transmission and reception are bi-directional half duplex i.e. transmit OR
receive but not simultaneously.
4.0mm
38.0 mm
Top View
(Transceiver)
14.0mm
10.0mm
15.0 mm
1 2
3 4 5 6 7 8 9
Pin Pitch 2.54 mm PCB Hole Size 1.0 mm
Figure 8 Physical Dimensions
ERx00-02 Series V2.5.doc
Datasheet Revision 2.5 September 2008
Copyright LPRS 2008
.
Page 10 of 31
LPRS Data Sheet
Easy-Radio ‘02’ (2nd Generation Modules)
ER400TS Transmitter, ER400RS Receiver & ER400TRS Transceiver
ER900TS Transmitter, ER900RS Receiver & ER900TRS Transceiver
Pin Description
Pin
No
Name
Description
Notes
1
2
Antenna
RF Ground
3
4
RSSI
Busy Output
5
6
7
8
Serial Data Out
Serial Data In
Host Ready
Input
Vcc
9
Ground
50Ω RF input/output. Connect to suitable antenna.
RF ground. Connect to antenna ground (coaxial cable screen
braid) and local ground plane. Internally connected to other
Ground pins.
Received Signal Strength Indication
Digital Output to indicate that transceiver is ready to receive
serial data from host.
Digital output for received data to host
Digital input for serial data to be transmitted
Digital Input to indicate that Host is Ready to receive serial
data from transceiver
Positive supply pin. +2.5 to +5.5 Volts. This should be a
‘clean’ noise free supply with less than 25mV of ripple.
Connect to supply 0 Volt and ground plane
CTS function
RTS function
Checklist
1. The module operates internally from an on board 3.3 Volt low drop regulator. The logic levels of the
input/output pins are therefore between 0 Volt and 3.3 Volts. (See specifications/performance data).
2. The serial inputs and outputs are intended for connection to a UART or similar low voltage logic
device. Do not connect any of the inputs or outputs directly to an RS232 port. The transceiver
module may be permanently damaged by the voltages (+/- 12V) present on RS232 signal lines. See
Application Circuit (Figure 11) for typical connection to an RS232 port via MAX232 interface IC.
3. The ‘Host Ready Input’ should be tied to 0 Volt (Ground) if not used, only when handshaking is
enabled.
4. The ‘Serial Data In’ should be tied to Vcc if not used. (Receive mode only).
5. Outputs will drive logic operating at 5 Volts and inputs will be correctly driven by logic operating at 5
Volts (CMOS & TTL logic levels).
6. Fit 1K resistors in series with data lines if connecting to 5V logic.
ERx00-02 Series V2.5.doc
Datasheet Revision 2.5 September 2008
Copyright LPRS 2008
.
Page 11 of 31
Easy-Radio ‘02’ (2nd Generation Modules)
ER400TS Transmitter, ER400RS Receiver & ER400TRS Transceiver
ER900TS Transmitter, ER900RS Receiver & ER900TRS Transceiver
LPRS Data Sheet
Application & Operation ERx00TRS-02
Figure 9 shows a typical system block diagram comprising hosts (user’s application) connected to EasyRadio Transceivers. The hosts (A & B) will be monitoring (collecting data) and/or controlling (sending data) to
some real world application.
Serial Data Output
Serial Data Input
Host
(A)
Easy-Radio
Transceiver
(A)
Busy
Serial Data Output
RF Link
Easy-Radio
Transceiver
(B)
Serial Data Input
Busy
Host Ready
Host
(B)
Host Ready
Figure 9 Typical System Block Diagram
The hosts provide serial data input and output lines and two ‘handshaking’ lines that control the flow of data
to and from the Easy-Radio Transceivers. The ‘Busy’ output line, when active, indicates that the transceiver
is undertaking an internal task and is not ready to receive serial data. The ‘Host Ready’ input is used to
indicate that the host is ready to receive the data held in the buffer of the Easy-Radio Transceiver.
The host should check before sending data that the ‘Busy’ line is not high, as this would indicate that the
transceiver is either transmitting or receiving data over the radio link. It should also pull the ‘Host Ready’ line
low and check that no data appears on the Serial Data Output line.
Timing Specifications – Applies to all Easy-Radio Modules.
Parameters
Min
Units
Notes
Host Serial Input/Output
Host Character Format
End of Data Delay
RF Transmit
Buffer Size
2400, 4800, 9600, 19200, 38400 + Custom
1 Start, 8 Data, No Parity, 1 Stop
2 x BAUD BYTE Duration
13.2 + (n Bytes X 0.8)
1-180
baud
Bits
mS
mS
Bytes
1
2 &2a
3
4
5
Notes
1. Data is inverted i.e. Start Bit is logic low. The inputs are intended for direct connection to a
microcontroller UART or to RS232 inputs and outputs via an RS232 Level translator such as a
Maxim MAX232, which invert the logic of the RS232 signals. This allows direct connection to, for
example a Microcontroller UART. The data rate is user programmable (Default 19200 baud) and
may differ between individual units within a system. (See Application Circuit diagram for logic level to
RS232 interface figure 11).
2. 1 start, 8 data, 1 stop = 10 bits @ 104uS/bit = 0.52mS/character at 19200 Baud. (Default)
a. Some Custom BAUD rates require 2 stop bits, otherwise some characters may be lost.
b. If parity is used, substitute in the above calculation using 11 bits.
3. The ‘End of Data’ delay is fixed at twice the character time.
4. A fixed package overhead of 13.2mS is added to all packets.
5. The buffer size is limited to 180 bytes. Sending more than 180 bytes will cause loss of data.
a. CTS pin will go high 2 bytes before the buffer is full. This allows characters already sent to
be accepted by the ER module.
ERx00-02 Series V2.5.doc
Datasheet Revision 2.5 September 2008
Copyright LPRS 2008
.
Page 12 of 31
LPRS Data Sheet
Easy-Radio ‘02’ (2nd Generation Modules)
ER400TS Transmitter, ER400RS Receiver & ER400TRS Transceiver
ER900TS Transmitter, ER900RS Receiver & ER900TRS Transceiver
Absolute Maximum Ratings ERx00TS-02, ERx00RS-02 and ERx00TRS-02
Operating Temperature Range
Storage Temperature Range
-40° C to +85° C
-40° C to +85° C
Vcc
All Other Pins (N.B.)
Antenna
- 0.3 to + 6 Volts
- 0.3 to 3.3 Volts
50V p-p @ < 10MHz
Performance Data: ERx00TS-02 Transmitter Supply +5.0 Volt ± 5%, Temperature 20° C
DC Parameters
Pin
Min
Typical
Max
Units
Notes
Supply Voltage (Vcc)
Supply current
Interface Levels
Data Input Logic 1
Data Input Logic 0
Input Impedance
RF Parameters
Antenna Impedance
RF Frequency
3
3
2.5
5.0
23
5.5
Volts
mA
1
RF Power Output
2
2.0
Pin
2
Frequency accuracy
FM deviation
Harmonics
Data Rate
Logic Timing
Power Up Time
Mechanical
Size
Pin Pitch
Weight
Min
433
868
902
-5
-5
4
0.2
434
870
928
+10
+7
Volts
Volts
KΩ
Units
Ohms
MHz
MHz
MHz
dBm (434MHz)
dBm (869MHz)
19.2
(Default)
38.4
ppm
KHz
dBc
Kbps
Typical
13
Max
35
Units
mS
100
Typical
50
434
869.85
915
+10
+7
Max
±10
64
-43
2.4
Pin
Min
31 x 12 x 4
2.54
2.5
Notes
See ER
Configuration
Command set
50Ω load
(depends on
frequency)
Overall
Below fundamental
Custom Over Air
BAUD rates can be
set via software
Notes
2
mm
mm
gms
Standard 0.1 Inch
Notes
1. Measured on full RF power. Current will reduce as power decreases.
2. Time required to ‘lock’ synthesiser from power up. If not previously calibrated or after a channel
change, power up time is increased to 35mS.
ERx00-02 Series V2.5.doc
Datasheet Revision 2.5 September 2008
Copyright LPRS 2008
.
Page 13 of 31
LPRS Data Sheet
Easy-Radio ‘02’ (2nd Generation Modules)
ER400TS Transmitter, ER400RS Receiver & ER400TRS Transceiver
ER900TS Transmitter, ER900RS Receiver & ER900TRS Transceiver
Performance Data: ERx00RS-02 Receiver Supply +5.0 Volt ± 5%, Temperature 20° C
DC Parameters
Pin
Min
Typical
Max
Units
Supply Voltage (Vcc)
Receive supply current
8
8
8
2.5
5.0
19.5
120
5.5
Volts
MA
Sleep Mode current
Interface Levels
Data Output Logic 1
Data Output Logic 0
Logic Output Current
Data Input Logic 1
Data Input Logic 0
Input Pull-ups
RF Parameters
Antenna Impedance
RF Frequency
Receiver
Receive Sensitivity
LO leakage
Data Rate
RSSI Output
Logic Timing
Initial Power Up Time
Mechanical
Size
Pin Pitch
Weight
µA
3.1
0.1
Pin
1
Min
433
868
902
-99
3
2.4
0
Pin
Min
Volts
Volts
MA
Volts
Volts
KΩ
Units
Ohms
MHz
MHz
MHz
10k load to +Vcc supply
10k load to +Vcc supply
BER = 10-3
Meets EN 300 220-3
38.4
1.2
dBm
dBm
Kbps
Volt
Max
75
Units
mS
Notes
1
mm
gms
Standard 0.1 Inches
25
3.6
0.2
2.0
100
Typical
50
434
869.85
915
-102
< -60
19.2
Typical
14
38 x 14 x 4
2.54
3.5
Notes
Max
434
870
928
-105
Notes
See ER Configuration
Command set
See Figure 10
Mm
Notes
1. When power is first applied to the module the processor retrieves ‘calibration’ data for the RF section
that compensates for temperature and power supply voltage variations. The receiver will then be
ready to receive. It would normally be left in this powered state ready to receive data.
ERx00-02 Series V2.5.doc
Datasheet Revision 2.5 September 2008
Copyright LPRS 2008
.
Page 14 of 31
LPRS Data Sheet
Easy-Radio ‘02’ (2nd Generation Modules)
ER400TS Transmitter, ER400RS Receiver & ER400TRS Transceiver
ER900TS Transmitter, ER900RS Receiver & ER900TRS Transceiver
Performance Data: ERx00TRS transceiver Supply +5.0 Volt ± 5%, Temperature 20° C
DC Parameters
Pin
Min
Typical
Max
Units
Supply Voltage (Vcc)
Transmit supply current
Receive supply current
Sleep Mode current
8
8
8
8
2.5
5.0
25
21
120
5.5
Volts
mA
mA
Interface Levels
Data Output Logic 1
Data Output Logic 0
Logic Output Current
Data Input Logic 1
Data Input Logic 0
Input Pull-ups
RF Parameters
Antenna Impedance
RF Frequency
Transmitter
RF Power Output
Logic Timing
Initial Power Up Time
Mechanical
Size
Pin Pitch
Weight
Pin
1
Min
433
868
902
1
Frequency accuracy
FM deviation
Harmonics
Over Air Data rate
Receiver
Receive Sensitivity
LO leakage
Serial Data Rate
RSSI Output
µA
3.1
0.1
25
3.6
0.2
2.0
-5
-5
2400
-99
3
0.3
0
Pin
Min
100
Typical
50
434
869.85
915
Max
434
870
928
Volts
Volts
mA
Volts
Volts
KΩ
Units
Ohms
MHz
MHz
MHz
10k load to +Vcc supply
10k load to +Vcc supply
dBm (434MHz)
dBm (869MHz)
ppm
kHz
dBc
bps
50Ω load
Depends on Frequency
Overall
BER = 10-3
Meets EN 300 220-3
Host interface. 6
See Figure 10
Notes
2,3
+10
+5
±10
64
-25
19200
+10
+5
-102
< -60
19.2
-105
38.4
1.2
dBm
dBm
Kbps
Volt
Typical
13
Max
75
Units
mS
38 x 14 x 4
2.54
3.5
Notes
38400
1
Notes
See ER Configuration
Command set
Manchester Encoded
Mm
mm
gms
Standard 0.1 Inches
Notes
1. The ‘Host Ready Input’ and the ‘Serial Data Input’ have ‘weak’ internal pull-ups enabled. These
inputs should not however be left ‘floating’ but should be tied to either Vcc via a resistor for the Serial
input or Ground 0 Volts for the Host Ready Input.
2. When power is first applied to the module the processor retrieves ‘calibration’ data for the RF section
that compensates for temperature and power supply voltage variations. The transceiver will then be
ready to receive (default) or transmit. It would normally be left in this powered state ready to receive
data.
3. During power up the Busy Output line goes high.
ERx00-02 Series V2.5.doc
Datasheet Revision 2.5 September 2008
Copyright LPRS 2008
.
Page 15 of 31
LPRS Data Sheet
Easy-Radio ‘02’ (2nd Generation Modules)
ER400TS Transmitter, ER400RS Receiver & ER400TRS Transceiver
ER900TS Transmitter, ER900RS Receiver & ER900TRS Transceiver
Easy-Radio Configuration Command Set
The programming software sends ‘Text Commands’ to the modules and this action can be performed by
terminal software or the host’s Microcontroller using the following list of commands:
Note that shaded items are new 02 commands only.
Command
Function
ER400
ER900
Notes
Programmable via
ER Windows
Software (ii)
RS232 Communication Settings
ER_CMD#U0
Custom BAUD
rate
300
300
ER_CMD#U1
ER_CMD#U2
ER_CMD#U3
ER_CMD#U4
ER_CMD#U5
ER_CMD#U?
UART Data Rate
2400
4800
9600
19200
38400
2400
4800
9600
19200
38400
ER_CMD#H1
ER_CMD#H2
Handshaking ON
Handshaking OFF
OFF
ER_CMD#A70
ER_CMD#A71
ER_CMD#A72
PARITY DISABLE
EVEN PARITY
ODD PARITY
DISABLED BY DEFAULT
When enabled data = 1 Start, 8 Data, 1 Parity, 1 Stop
ER_CMD#I7
ER_CMD#I8
FAST ACK Enable
FAST ACK Disable
Get UART Value
The module replies
echos with the UART
value. Eg:
ER_CMD#U2
No ACK is required.
OFF
OFF
OFF
ER400Series
1mW
2mW
3mW
4mW
5mW
6mW
7mW
8mW
9mW
10mW
ER900 Series
0.0625mW (TS)
0.125mW (TS)
0.25mW (TS)
0.5mW (TS)
1.2mW (TS)
1.5mW (TS)
2mW (TS)
3.1mW (TS)
4mW (TS)
5mW (TS)
Only effects RTS
Pin.
(Upper case i)
See notes on “FAST
ACK” below.
RF POWER Settings
ER_CMD#P0
ER_CMD#P1
ER_CMD#P2
ER_CMD#P3
ER_CMD#P4
ER_CMD#P5
ER_CMD#P6
ER_CMD#P7
ER_CMD#P8
ER_CMD#P9
ER_CMD#P?
RF Power Output
ERx00-02 Series V2.5.doc
Datasheet Revision 2.5 September 2008
Sets output
power on a
channel.
Warning! This level
will be set to the
default setting when
the frequency is
changed or reset via
a Channel command.
Get Power Value
Copyright LPRS 2008
.
0.0625mW (TRS)
0.125mW (TRS)
0.25mW (TRS)
0.5mW (TRS)
1mW (TRS)
1.2mW (TRS)
1.5mW (TRS)
2mW (TRS)
2.5mW (TRS)
3.1mW (TRS)
The module replies
with the power value.
eg:
ER_CMD#P9
No ACK is required.
Page 16 of 31
LPRS Data Sheet
ER_CMD#p0
ER_CMD#p1
ER_CMD#p2
ER_CMD#p3
ER_CMD#p4
ER_CMD#p5
ER_CMD#p6
ER_CMD#p7
ER_CMD#p8
ER_CMD#p9
Easy-Radio ‘02’ (2nd Generation Modules)
ER400TS Transmitter, ER400RS Receiver & ER400TRS Transceiver
ER900TS Transmitter, ER900RS Receiver & ER900TRS Transceiver
Set Default RF
Power Output.
This allows the host
to set each channel
to a different default
power setting. (Ideal
for automatic
selection between
bands like 869 & 914
etc.)
1mW
2mW
3mW
4mW
5mW
6mW
7mW
8mW
9mW
10mW
0.0625mW
0.125mW
0.25mW
0.5mW
0mW
1mW
2mW
3mW
4mW
5mW
NOTE lower case ‘p’
RF Channel Settings
ER_CMD#C0
ER_CMD#C1
ER_CMD#C2
ER_CMD#C3
ER_CMD#C4
ER_CMD#C5
Channel 0
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
433.23 MHz
433.30 MHz
433.45 MHz
433.55 MHz
433.68 MHz
433.83 MHz
869.9MHz
914.65MHz
Not Set
Not Set
869.85MHz(i)
Not Set
ER_CMD#C6
ER_CMD#C7
Channel 6
Channel 7
433.88 MHz
434.00 MHz
Not Set
Not Set
ER_CMD#C8
ER_CMD#C9
ER_CMD#C?
Channel 8
Channel 9
Get Channel Value
434.15 MHz
434.35 MHz
Not Set
Not Set
All channels can now be
chosen in software.
Custom frequencies can
only be set using
software available from
LPRS.
The module replies
echos with the power
value. Eg:
ER_CMD#C9
No ACK is required.
MISCELLANEOUS COMMANDS
ER_CMD#R1
Reset to
Default Settings
U4, P9, C7
ER_CMD#L0
Sleep
ER_CMD#A00
ER_CMD#A01
ER_CMD#A10
ER_CMD#A31
DCS OFF (default)
DCS ON
Encryption OFF
(default)
Encryption ON
CRC16 OFF (default)
CRC16 ON
Repeater Mode OFF
(default)
Repeater Mode ON
ER_CMD#Fds
FREQUENCY SWAP
This command shuts down the transceiver completely by
halting the oscillator and dropping the microprocessor
down to a slow clock speed.
Toggle the RTS pin to wake up. (Allow start-up Time)
Recommended ON for new designs where back
compatibility to older devices is not required
Encryption algorithm is created and owned solely by
LPRS. It uses a 16-bit seed that can be set by the
developer.
The CRC16 routines are more efficient and secure than
the old CRC8. For new applications it is recommended.
When enabled, this mode will simply echo EVERY
message it hears. Therefore no more than 1 repeater
should be used UNLESS specific rules are followed.
An application note will be available shortly to explain this
further.
This feature allows you to transmit on a different channel
frequency to the receive frequency.
e.g. ER_CMD#F07
After reselecting channel 0, the module will listen on CH0
but transmit on CH7.
To reset the module to its default, send the same source
channel number to the destination:
e.g. ER_CMD#F00
Warning DCS should be disabled to use this feature.
ER_CMD#A11
ER_CMD#A20
ER_CMD#A21
ER_CMD#A30
‘d’ = destination
‘s’ = source
ERx00-02 Series V2.5.doc
Datasheet Revision 2.5 September 2008
U4, P9, C0
Copyright LPRS 2008
.
Factory Default
Page 17 of 31
LPRS Data Sheet
Easy-Radio ‘02’ (2nd Generation Modules)
ER400TS Transmitter, ER400RS Receiver & ER400TRS Transceiver
ER900TS Transmitter, ER900RS Receiver & ER900TRS Transceiver
TEST MODES
ER_CMD#T0
ER_CMD#T1
ER_CMD#T2
ER_CMD#T3
Upper FSK Carrier
Modulated Carrier
Lower FSK Carrier
Get Firmware
Revision
ER_CMD#T4
RAW Data Test
i)
ii)
Test Mode 0
Test Mode 1
Test Mode 2
Returns Firmware
String: eg
ER400TRS-02V2.01.5
Out of CTS pin
Recommended setting for EN300-220 compliance This setting is effective on ALL
ER900TRS/RS/TS despatched on or after 5th September 2005.
Use the custom BAUD settings with extreme caution especially on versions up to V2.0.1.7. If the
custom BAUD rate has been set to a speed that is not compatible with a PC, it can only be reset
using a microcontroller set to the same BAUD. From firmware V2.01.8, a start-up reset to 19200
can be set by grounding the pin on the reverse of the module on power up. This mode is
temporary and allows the user to recover the module, using ER commands at 19200.(See
picture Below)
To successfully send a command do the following:
1. Send Command from host:
e.g.
ER_CMD#U5
2. In the case of a TRS/RS:
o Wait for echo of command from module.
In the case of a TS:
o Wait 20mS
3. Send the ASCII string from the host:
ACK
(Set UART BAUD to 38400)
e.g. ER_CMD#U5
The commands should be sent exactly as shown (case sensitive) with no spaces between characters. The
ACK command is sent as three ASCII characters, ACK in sequence. ‘A’’C’’K’ .
Note that the TS (transmitter) devices send data ‘over air’ as they are not equipped with a serial data out or
handshake pins. This takes approximately 20mS and time should be taken in to account before sending the
‘ACK’ sequence
“FAST ACK”
In this mode the procedure to update settings is made much faster. In response to an ER_CMD#x string the
TRS/RS module will reply with a single HEX 6 (0x06) which is the ASCII ACK value. The host will then issue
the same single byte 0x06 in replacement of the Txt version of “ACK”.
ERx00-02 Series V2.5.doc
Datasheet Revision 2.5 September 2008
Copyright LPRS 2008
.
Page 18 of 31
Easy-Radio ‘02’ (2nd Generation Modules)
ER400TS Transmitter, ER400RS Receiver & ER400TRS Transceiver
ER900TS Transmitter, ER900RS Receiver & ER900TRS Transceiver
LPRS Data Sheet
Notes:
RSSI Output
The Receiver/Transceiver has a built in RSSI (Received Signal Strength Indicator) that provides an analogue
output voltage that is inversely proportional to the RF energy present within the pass band of the receiver. It
ranges from 0 Volt (maximum signal, –65dBm) to 1 Volt (minimum signal, -115bBm) and has a slope of
approximately 50dB/Volt. This analogue output signal should only be connected to a high impedance load
(>100kΩs) and can be used to provide a measure of the signal strength and any interfering signals (noise)
within band during the installation and operation of systems.
Figure 10 RSSI Output
Voltage
1.3
1.2
1.1
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-115
433Mhz
868MHz
-110
-105
-100
-95
-90
-85
-80
-75
-70
-65
Received Signal Strength (dBm)
Application Notes
MAX232 Application
Antenna
7805
+5V
VO
ANT
RF GND
RSSI
BUSY
DATA OUT
DATA IN
HOST RDY
VCC
GND
1
2
G
N
D
100n
1
2
3
4
5
6
7
8
3
4
5
6
7
8
9
16
15
14
13
12
11
10
9
C1+
VCC
V+
GND
C1T1OUT
C2+
R1IN
C2R1OUT
VT1IN
T2OUT
T2IN
R2IN
R2OUT
Vin = 8-12V DC
VI
1N4148
100n
1
6
2
7
3
8
4
9
5
100n
DCD
DSR
RXD
RTS
TXD
CTS
DTR
RI
GND
PC AT
MAX232
ER
0 Volt
100n
Host Ready Tied Low
Figure 11 MAX232 Application Circuit
Compatibility
The ERx00TS, ERx00RS & ERx00TRS use crystal controlled synthesisers to accurately define transmit and
receive frequencies incorporating RS232 protocols, and so should not be used in connection with Non-Easy
Radio RF modules unless the firmware allows.
ERx00-02 Series V2.5.doc
Datasheet Revision 2.5 September 2008
Copyright LPRS 2008
.
Page 19 of 31
LPRS Data Sheet
Easy-Radio ‘02’ (2nd Generation Modules)
ER400TS Transmitter, ER400RS Receiver & ER400TRS Transceiver
ER900TS Transmitter, ER900RS Receiver & ER900TRS Transceiver
PCB Layout
The Ground (0 Volt) pins of the receiver should be connected to a substantial ground plane (large area of
PCB copper) connected to 0 Volt. It is suggested that a double sided PCB be used with one layer being the
ground plane.
Power Supply
The supply used to power the receiver should be ‘clean’ and free from ripple and noise (
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