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Instructions atmospheric pressure transmitter (485 type) V1.0 RS-QY-N01-2-4 Atmospheric pressure Transmitter user's Guide (485 type) Document version：V1.0 Shandong RenKe Control Technology Co., 1 www.temperaturehumiditysensor.com Instructions atmospheric pressure transmitter (485 type) V1.0 Shandong RenKe Control Technology Co., 2 www.temperaturehumiditysensor.com Instructions atmospheric pressure transmitter (485 type) V1.0 Context 1. Introduction ............................................................................................................................. 4 1.1 Product Overview ....................................................................................................... 4 1.2 Features ....................................................................................................................... 4 1.3 Main Specifications..................................................................................................... 4 1.4 Product Selection ........................................................................................................ 5 1.5 System frame diagram................................................................................................. 5 2. Installation instructions ......................................................................................................... 5 2.1 Equipment installation check ...................................................................................... 6 2.2 Interface Description ................................................................................................... 6 2 .3 electrical wiring.......................................................................................................... 6 2.4 Description field wiring 485 ....................................................................................... 6 3. Configure the software installation and use ...................................................................... 6 3.1 Software Selection ...................................................................................................... 6 3.2 parameter settings ....................................................................................................... 6 4. Communication Protocol ...................................................................................................... 9 4.1 The basic parameters of Communications .................................................................. 9 4.2 Frame format definition data ....................................................................................... 9 4.3 Register Address ......................................................................................................... 9 4.4 protocol examples and explanation ........................................................................... 10 5. Common Problems and Solutions ....................................................................................... 10 5.1 device can not connect to a PLC or PC ..................................................................... 10 6. Contact ................................................................................................................................ 11 7. Document History ............................................................................................................... 11 8. Size housing ........................................................................................................................ 11 Shandong RenKe Control Technology Co., 3 www.temperaturehumiditysensor.com Instructions atmospheric pressure transmitter (485 type) V1.0 1. Introduction 1.1 Product Overview RS-QY-N01-2 atmospheric pressure transmitter made of imported high-precision measuring means, high-accuracy temperature compensation device, high stability, low drift high repeatability; easy selection of wall-mounted housing is fixed to the wall. Need accommodation suitable temperature measuring barometric pressure monitoring and small weather station, altimeter, agricultural greenhouses, archives and the like. 1.2 Features Wide DC supply voltage 10-30V Standard ModBus-RTU protocol Atmospheric pressure and temperature measured simultaneously 0-120Kpa wide pressure range, can be applied to various altitudes 1.3 Main Specifications DC power supply (default) Accuracy 10 ~ 30V DC ±0.15Kpa@25 ℃ 75Kpa Air pressure temperature Transmitter circuit operating temperature Measuring medium Measuring range -20 ℃ ~ + 60 ℃, 0 % RH ~ 80% RH air Air pressure 0 ~ 120Kpa temperature Long - term stability ± 0.5 ℃ (25 ℃) (default) Air pressure -40 ℃ 80 ℃ (customizable) -0.1Kpa / Year temperature ≤ 0.1 ℃ / Year Response time ≤ 1S output signal 485 (modbus) protocol Baud Rate: 2400, 4800 (default), 9600 Data bit length: 8 Shandong RenKe Control Technology Co., 4 www.temperaturehumiditysensor.com ~ Instructions atmospheric pressure transmitter (485 type) V1.0 Parity mode: none Stop bit length: 1 The default ModBus Address: 1 Support Function code: 03 Parameter configuration Software configuration Power consumption ≤ 0.5W 1.4 Product Selection Ren Shuo company code RS- Atmospheric pressure transmitter QY - 485 N01- (modbus) protocol Probe built-in 2-4 1.5 System frame diagram 2. Installation instructions Shandong RenKe Control Technology Co., 5 www.temperaturehumiditysensor.com Instructions atmospheric pressure transmitter (485 type) V1.0 2.1 Equipment installation check Equipment List: ■ transmitter equipment 1 ■ certificate, warranty card, service card, etc. ■ 12V / 2A 1 water supply station (optional) ■ USB to 485 (optional) ■ 485 terminating resistor (optional) 2.2 Interface Description Wide voltage power input 10 ~ 30 V can. Note that the signal line wiring 485 A / B two lines can not be reversed, the address bus between multiple devices must not conflict. 2 .3 electrical wiring Line color Description Electricity source brown A positive power supply (10 ~ 30 V DC) black Negative power supply through letter yellow 485 -A blue 485 -B 2.4 Description field wiring 485 When a plurality of types of devices 485 connected to the same bus, the field wiring have certain requirements, refer to the specific data packet "485 field wiring device manual." 3. Configure the software installation and use 3.1 Software Selection Opening the datagram, and choosing “test software” ---- “485 parameter setting software” and finding out and opening it. 3.2 parameter settings Shandong RenKe Control Technology Co., 6 www.temperaturehumiditysensor.com Instructions atmospheric pressure transmitter (485 type) V1.0 ① select the right COM port “ ( my computer——properties——deceive manager——Port”) and check the COM port from the Port, the name of several different kinds of 485 transmitter drive ② connect with only one device and be powered, and click “test the baud rate” of the software to test the device baud rate and address, the default baud rate is 4800bit/s and default address is 0x01 ③change the address and baud rate based on the application requirement, and meanwhile the current situation of the device function can be checked ④if the test is not success, please check the device wring and 485 drive installation situation again Shandong RenKe Control Technology Co., 7 www.temperaturehumiditysensor.com Instructions atmospheric pressure transmitter (485 type) V1.0 Shandong RenKe Control Technology Co., 8 www.temperaturehumiditysensor.com Instructions atmospheric pressure transmitter (485 type) V1.0 4. Communication Protocol 4.1 The basic parameters of Communications Ed code 8-bit binary Data bits 8 Parity bit no Stop bit 1 Error checking CRC (cyclic redundancy code) 2400bit / s, 4800bit / s, 9600 bit / s can be set, the default setting is 48 00bit / s Baud rate 4.2 Frame format definition data Using M odbus - RTU communication protocol, in the following format: Initial structure ≥ 4 byte time address code = 1 byte function code = 1 byte Data area = N bytes Error checking = 16-bit CRC End structure ≥ 4 byte time Address code: for the address of the transmitter, the communication network is the only (factory default 0x01). Function Code: The host command functions such directions, the transmitter has used only the function code 0x03 (read data register). Data area: data area is the specific communication data, note data of 16bits endian! CRC code: two-byte checksum. Host query frame structure: address code function code 1 byte Register start address 1 byte Register length Check code low 2 bytes 2 bytes 1 byte Check high code 1 byte Slave Answer Frame Structure: address code 1 byte function code Valid bytes 1 byte 1 byte Data area Second area data The first data Check code region N 2 bytes 2 bytes 2 bytes 2 bytes 4.3 Register Address Shandong RenKe Control Technology Co., 9 www.temperaturehumiditysensor.com Instructions atmospheric pressure transmitter (485 type) V1.0 Register address PLC or configuration address content operating 0000 H 40001 Air pressure Upload data 10 times real data Read only 0001 H 40002 temperature Upload data 10 times real data Read only 4.4 protocol examples and explanation Example: Read the atmospheric pressure and the temperature of the device address 0x01 Inquiry frame: address code function code 0x 01 0x0 3 Start address Data length 0x00 0x00 0x00 0x0 2 Check code low Check code high 0x C4 0x 0B Answer frame: (E.g., the pressure reading is 1 5. 1 Kpa, a temperature of -10.1 deg.] C) Returns address function the number code code of valid bytes 0x 01 0x0 3 0x0 4 Air pressure Temperature value 0x0 0 0x9 7 0x FF 0x 9B Check Check code high code low 0x 4B 0x 84 Temperature calculation: When the temperature is below 0 ℃ When the temperature data is uploaded in the form of complement. Temperature: FF9B H (hexadecimal) = --101 => Temperature = -10.1 ℃ Pressure is calculated: Pressure: 97 H (hexadecimal) = 151 => Pressure = 1 5. 1 Kpa 5. Common Problems and Solutions 5.1 device can not connect to a PLC or PC possible reason: 1) computer has multiple COM ports, port selection is not correct. 2) device address error, or there is a duplicate device address (factory default all 1). 3) The baud rate, parity, data bits, stop bits error. Shandong RenKe Control Technology Co., 10 www.temperaturehumiditysensor.com Instructions atmospheric pressure transmitter (485 type) V1.0 4) The master polling interval and response wait time is too short, it is required more than 200ms provided. 5) 485 has turned off, or A, B line reversed. 6) the number of devices or the wiring too long, to be near the power supply, plus booster 485, while increasing 120 Ω termination resistor. 7) USB drive switch 485 is not installed or damaged. 8) equipment damage. 6. Contact Shandong RenKe Control Technology Co.,Ltd. Post code：250101 Tel：+86-531-58720832 Fax：+86-531-67805165 Website address: www.temperaturehumiditysensor.com 7. Document History V1.0 documents created. 8. Size housing Overall dimensions: 100 ×85 × 26 mm Shandong RenKe Control Technology Co., 11 www.temperaturehumiditysensor.com