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Item Details
1、Product description
Eight current input channel: DC0~20mA / DC4~20mA
RS485 MODBUS RTU standard communication protocol
Netted with configuration software, PLC or industry touch panel
Communication status LED
Communication circuit designed for thunder protection and interference immunity
Used for signal collection and control in industrial field
2、Specification
Analog input channel 8ch
Analog input range DC0~20mA / DC4~20mA
Analog input accuracy ±0.02mA
Working temperature -20~70℃
External power supply DC9V~30V/2W
Isolation protection DC1500V
Installation method Standard DIN slide rail or screw
Dimension 125×73×35mm
3、Interface description
AVcc | External power supply input positive |
AGnd | External power supply input negative / Power ground |
AI_1+ | Current input channel 1 positive |
Gnd | Current input channel negative / Common analog ground |
AI_2+ | Current input channel 2 positive |
Gnd | Current input channel negative / Common analog ground |
AI_3+ | Current input channel 3 positive |
Gnd | Current input channel negative / Common analog ground |
AI_4+ | Current input channel 4 positive |
Gnd | Current input channel negative / Common analog ground |
AI_5+ | Current input channel 5 positive |
Gnd | Current input channel negative / Common analog ground |
AI_6+ | Current input channel 6 positive |
Gnd | Current input channel negative / Common analog ground |
AI_7+ | Current input channel 7 positive |
Gnd | Current input channel negative / Common analog ground |
AI_8+ | Current input channel 8 positive |
Gnd | Current input channel negative / Common analog ground |
485B | RS485 signal B- |
485A | RS485 signal A+ |
4、Analog input application diagram
5、Communication description
5.1、Communication parameter: 9600, None, 8, 1 (default setting)
Parameter | Description |
9600 | baud rate |
None | check bit |
8 | data bit |
1 | stop bit |
5.2、Command for analog input data reading
Send: 01 03 00 00 00 08 44 0C (example/hex)
data | byte | data description | remark |
01 | 1 | module address | address range:01-FE |
03 | 1 | function code | 03-read holding register |
0000 | 2 | register address (4X type) | 0000-starting register address |
0008 | 2 | register number | 0008-read 8 registers |
440C | 2 | CRC check code | CRC check code for all data |
Receive: 01 03 10 09 CE 00 00 00 00 00 00 00 00 00 00 00 00 00 00 6C 5B (example/hex)
data | byte | data description | remark |
01 | 1 | module address | address range:01-FE |
03 | 1 | function code | 03-read holding register |
10 | 1 | byte of data | 10-read 16 bytes |
09CE 0000 0000 0000 0000 0000 0000 0000 | 16 | read data | 09CE-analog input channel 1 data 0000-analog input channel 2 data 0000-analog input channel 3 data 0000-analog input channel 4 data 0000-analog input channel 5 data 0000-analog input channel 6 data 0000-analog input channel 7 data 0000-analog input channel 8 data |
6C5B | 2 | CRC check code | CRC check code for all data |
This command reads module’s current input data.
The data of the analog input channel 1 is “09CE”, it will be 2510 after converting to decimal data. Put it in the formula: I=DATA*20/4095=2510*20/4095?12.26mA. The current of other analog input channel is 0mA.
5.3、Command for module address setting
Send:00 06 00 64 00 01 08 04 (example/hex)
date | byte | data description | remark |
00 | 1 | module address | 00-broadcast address |
06 | 1 | function code | 06-write single holding register |
0064 | 2 | register address (4X type) | 0064-module address register |
0001 | 2 | write data | 0001- module address, range:0001-00FE |
0804 | 2 | CRC check code | CRC check code for all data |
Receive:00 06 00 64 00 01 08 04 (example/hex)
This command sets module address (slave address) as “01” (default setting). This setting could be saved when power off. This is a broadcast command. It needs to ensure that only one module is connected to the master.
When module receives correct command, it will send response back to the master.
5.4、Command for communication parameter setting
Send:01 06 00 65 00 02 18 14 (example/hex)
data | byte | data description | remark |
01 | 1 | module address | address range:01-FE |
06 | 1 | function code | 06-write single holding register |
0065 | 2 | register address (4X type) | 0065-communication parameter register |
0002 | 2 | write data | 0001- 4800, None, 8, 1 0002- 9600, None, 8, 1 0003- 19200, None, 8, 1 0004- 38400, None, 8, 1 0005- 4800, Even, 8, 1 0006- 9600, Even, 8, 1 0007- 19200, Even, 8, 1 0008- 38400, Even, 8, 1 |
1814 | 2 | CRC check code | CRC check code for all data |
Receive:01 06 00 65 00 02 18 14 (example/hex)
This command sets communication parameter as “9600, None, 8, 1” (default setting). This setting could be saved when power off.
When module receives correct command, it will send response back to the master.
6、POWER/DATA LED description
When module powered on, LED is green.
When module is under communication, LED is twinkling.
When module receives correct command, LED is green.
When module receives incorrect command or other module’s command, LED is red.
7、PC debugging description
We provide a debugging software for function testing and parameter setting. Please follow the steps below:
Connect computer to module with RS485 converter.
Connect DC12V or DC24V power to module and power on. To avoid any unnecessary damage, please make sure the power positive and negative terminals are correctly connected before power on.
Open the software and select the model of module, you will see the window of function testing or parameter setting.
Set communication parameter and open the serial port.
Select corresponding setting and click “Read” or “Write” button.
8、RS485 network diagram