Arduino RF Shield
Zulu 2km Radio Link
Features
• RF serial Data upto 2KM Range
• Serial Data Interface with Handshake
• Host Data Rates up to 38,400 Baud
• RF Data Rates to 56Kbps
• 5 User Selectable Channels
• Secure Data Protocol
• CE Compliant for Licence Free Use
• 868MHz or 915MHz Versions
Description
The ZULU Arduino provides a radio (Modem) link with easy interface to for upto 2KM
range. Range may be further extended with suitable antenna.
All RF operation is auto controlled (with error checking etc) so the ZULU Arduino can be
treated as a simple Communications device. This shield is also compatible with the RF
Solutions Blizzard Modem.
The shield is ready to plug and play with default setting serial port set to 4800, 8 Bits,
No Parity, 1 Stop Bit (Hardware CTS / RTS).
Ordering Information
Part Number
Description
ZULU-M-ARDUINO
ZULU Modem Arduino Shield Board
Shield Connections
DS-ZULU-M-ARDUINO-2
ZULU Arduino
Shield Description:
Serial Data Format
Baud Rate:
Defined by DR1 and DR2 Pins
Data Bits:
8, No Parity, 1 Stop Bit
Flow Control: Hardware CTS / RTS
CTS, RTS
Clear to Send and Request to Send are standard data flow control used in RS232
systems, these are standard but operate at the Zulu Vcc low level voltage.
If no handshaking required RTS (Arduino D3) may be pulled low, however beware of data
overrun errors of transmitting streams of data longer than the data buffer!
RESET
If J5 (1-2, 3-4) are unconnected Reset and PD are disabled.
If J5 (1-2, 3-4) are connected Reset and PD are enabled and controlled by Arduino.
DR1 - DR2
These inputs define the host interface Baud Rate. They are read when RESET pin goes
high. Tip: It is good practice to operate the host interface at half the speed of the RF
data rate (set by Register R5.
DR1
DR2
Host Baud Rate
Vcc / Unconnected
Vcc / Unconnected
GND
GND
Vcc / Unconnected
GND
Vcc / Unconnected
GND
4,800
9,600
19,200
38,400
PD
This input enables ‘Sleep’ Mode. For normal operation connect to Vcc. No RF packets
will be received by the module when it is in sleep mode.
WRE
Controls where the User configuration parameters are saved in internal EEPROM (Non
Volatile) or RAM (Volatile) Un-used. This may be ignored unless the application requires
specific address timing on powerup.
DS-ZULU-M-ARDUINO-2
ZULU Arduino
Operation Overview
The ZULU MODEM Module provides a simple Modem interface to the host controller. It
handles all RF data communications automatically and without any requirement from
the user (RF packetizing, Preamble, Encoding, CRC Check etc).
With this powerful high-speed Radio link. The following networks can be realised;
One-to-One operation; for point to point data communication.
One-to-Many; A network consisting a master and many slaves (the receivers all have
the same address).
Many-to-One; Where the transmitters all send to a single receiver address.
Because each ZULU MODEM can contain a unique address, multiple ZULU networks
can co-exist in the same area.
Broadcast operation; Where a single master Zulu MODEM addresses many ZULU
MODEMS concurrently. (using many ZULU MODEM modules set to the same address).
Operating Modes:
Configuration Mode: In Configuration mode the Zulu MODEM can receive a number of
commands and the internal registers can be pre-set to control its operation. In this
mode the Zulu MODEM is ‘Offline’ and cannot send or receive RF data.
Normal Operation: ZULU MODEM is ’Online’ automatically transmitting and receiving
data from its host and across the RF network.
Each ZULU MODEM has its own pre-set address. This is user set during configuration.
Any data received is examined and the address header embedded within the data packet
is compared with its address. Only data received with matching address will be
processed and output to the host, all other data will be discarded.
All ZULU MODEM modules are shipped with a default address of 7F7F7F.
The ZULU MODEM contains an on-board data buffer equal to two data packets.
Therefore if RTS is asserted (then the host is unable to receive data) the module will
store a max of two data packets, all further data packets received will be discarded.
DS-ZULU-M-ARDUINO-2
ZULU Arduino
Configuration Mode (offline)
Commands can be set using a standard Terminal program or by sending the relevant ASCII
characters.
Each Command must be followed by the Carriage Return or ‘Enter’
Note: All commands are entered in upper case.
Command
Description
Response from Zulu
Enter Configuration Mode
+++
?
F
H
P
Note: these must be sent as a string
with no char in front or behind
this is to ensure that the
+++ is not mistakenly
received in mid data.
retrieve the current register values
Zulu responds with Status info
Zulu responds with all Register Values
set factory defaults;
R1=7F7F7F
R2=7F7F7F
R3 = Ch2 (869.450MHz)
R4 = 7
(+20dBm)
R5 = 1
(19K2)
‘OK’
Help
Brief description of commands available
Ping Mode
This sends a ping request .
The originating Zulu Modem will
respond with the Recipient Zulu
Modems’ response, eg.
Received from 7F7F7F (D5)
On receiving, the recipient Zulu
Modem will respond with its address
and the level of RSSI (Received Signal
Strength)
The Ping command is continuously
repeated every 1 second until any
command or character is entered.
Where
7F7F7F = the recipient Address
D5= RSSI
RSSI
Is a Hex value corresponding to the
received signal strength
Min = 20hex
Max =E0hex
S
S
Save Configuration
‘SAVED’
Q
Exit configuration mode and return to
online mode
No response
DS-ZULU-M-ARDUINO-2
ZULU Arduino
Register Setting (Configuration Mode)
The internal registers enable various parameters to be controlled.
To set a register type ‘R#=x’ where # is the register number (1-6) and x is the value to set
For example, to set the channel to channel 3 type the following.
R3=3
(Where is carriage return or enter on the keyboard) The modem will then return ‘OK’ or
‘Error’ if an incorrect command is entered. Save the changes by typing
S
The modem will return with ‘SAVED’
Default values are shown in BOLD
Register
Value Range
Description
Example
R1
0000 - FFFFFF
(24 bit address)
Sets the recipient Zulu
MODEM Address
R1=0001
(Data sent is addressed to
Set own Zulu Modem
address
R2=F001
(Data sent is from Zulu MODEM with address F001)
0000 - FFFFFF
(24 bit address)
R2
R3
CH0
CH1
CH2
CH3
CH4
=
=
=
=
=
868.400
868.900
869.450
869.600
869.800
MHz
MHz
MHz
MHz
MHz
0 = +1dBm
1 = +2dBm
2 = +5dBm
3 = +8dBm
4 = +11dBm
5 = +14dBm
6 = +17dBm
R4
0
1
2
3
R5
=
=
=
=
9,600
19,200
28,800
56,000
Set RF channel
R3=2
(Transmit on Channel 2)
Set the RF Transmit
Power output*
R4=7
(sets Transmit Power to
max)*
Set the RF baud rate*
R5=3
(sets the RF data rate to
56Kbps)
Channel Number
Frequency
Centre (MHz)
EU Power Allowance
mW / dBm
0
1
2
3
4
868.400
868.900
869.450
869.600
869.800
25 / 14
25 / 14
100 / 20
100 / 20
25 / 14
Notes
Applicable standard - EN300-220
Notes on power and frequency
The EU standard sets maximum power transmission limits dependent on the frequency, the
bandwidth and the application. Please check the relevant standards are being met when
implementing your RF Application. A rough guidance applicable to the ZULU channel numbers is
given below:
*Note: Reducing Tx power reduces battery consumption!
Reducing the baud rate will increase the range!
DS-ZULU-M-ARDUINO-2
ZULU Arduino
Simplified Declaration of Conformity (RED)
BG - С настоящото RF Solutions Limited декларира, че този тип радиосъоръжение дефинирани в този документ е в съответствие с Директива 2014/53/ЕС. Цялостният
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RF Solutions Ltd. Recycling Notice
Waste Batteries and Accumulators
Meets the following EC Directives:
Directive 2006/66/EC
DO NOT
Where batteries are fitted, before recycling the product,
Discard with normal waste, please recycle.
the batteries must be removed and disposed of at a licensed
ROHS Directive 2011/65/EU and amendment 2015/863/EU
collection point.
Specifies certain limits for hazardous substances.
RF Solutions battery producer number: BPRN00060.
WEEE Directive 2012/19/EU
Waste electrical & electronic equipment. This product must be disposed of through a licensed WEEE collection point. RF Soluti ons Ltd., fulfills its
WEEE obligations by membership of an approved compliance scheme. Environment Agency producer registration number: WEE/JB0104WV.
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