Product introduction

ADM-4188 is 8 channel isolated digital / switch input and output module, which is widely used in industrial field, signal acquisition, monitoring and control. The 8 Channel isolating the digital input and the 8 channel isolating the digital output, and the digital output is the NPN type transistor set open circuit output. The communication interface is RS-485 interface that supports the standard MODBUS RTU protocol and can be connected to configuration software, PLC, and DCS industrial touch screen.

performance parameter

Digital input
1. Input channel: 8-Ch dry contact or level signal
2. Input polarity: co - negative or co - positive (automatic adaptation)
3. Input range: high level (1):10V - 30V, low level (0): 0V - 1V
4. Sampling rate: 1000Hz
5. Isolation voltage: 1500V
6. Input counter: 8-Ch 16 bit counter (0~65535), input frequency less than 200HZ

Digital output
1. Output channel: 8-Channel NPN transistor collector open circuit output
2. Load voltage: maximum 40V
3. Load current: 150mA@625mW

Communication interface
1. Communication protocol: MODBUS-RTU
2. Interface type: RS-485 interface
3. Interface protection: 600W surge, 15KV ESD protection, 1500V isolation protection
4. Baud rate: 1200/2400/4800/9600/19200/38400/57600/115200
5. Parity：No, even, odd
6. Default: 9600, N, 8, 1 (modifiable)

System parameter
1. Module size: 104mm x 72mm x 26mm
2. Installation: 35mm DIN-Rail installation
3. Environment: temperature: -20~70 C ,humidity: 0-95%, not condensing
4. Power supply: DC9~30V, less than 2W

Indicator light definition
1. POWER: power indication, "bright" power supply is normal
2. COMM: RS-485 communication indicates that "flash" sends and receives data
3. DI0~DI7: digital input indicator, "bright" input is 1
4. DO0~DO7: digital output indicator, "bright" output is 1

Using the default communication parameters
When you forget module communication (ID, baud rate, parity bit), the INIT and DOGND pins are short circuited, to give power to the module, the communication module for the parameters (9600, N, 8, 1), ID is 1.
INIT and DOGND pin is disconnected, module using parameters set by the user. the default parameters for the module (9600, N, 8, 1), ID is 1.

Module register address description
10001~10008: Digital Input register address (1x)
Use the 02 function code 0000H-0007H.
00001~00008: Digital Output register address (0x)
Use the 01 and 15 function code 0000H~0007H.
40161~40164: Module's parameter register address (4x)
Use the 03 and 06 function code 00A0H~00A3H.
40001~40008: Counter register address (4x)
Use the 03 and 16 function code 0000H~0007H.
40033~40040: Counter mode register address (4x)
Use the 03 and 16 function code 0020H~0027H.

MODBUS-RTU Example of communication format
The following values are 16 HEX
1. Read the value of the 8 channel digital input
Host sending：01 02 00 00 00 08 79 CC
01    (ID)
02    (Function code)
00 00 (Starting address)
00 08 (Register number)
79 CC (CRC code)
Module return：01 02 01 00 A1 88
01   (ID)
02   (Function code)
01   (Number of bytes)
A1 88(CRC Code)
00   (The "0" representative has no switch input）

2. Write the output value of the 8 channel
Host sending：01 0F 00 00 00 08 01 0F BE 91
01    (ID)
0F    (Function code)
00 00 (Starting address)
00 08 (Register number)
01    (Number of bytes)
0F    (0F represents DO0-DO3 output 1, DO4-DO7 output 0)
BE 91 (CRC Code)
Module return：01 0F 00 00 00 08 54 0D
01    (ID)
0F    (Function code)
00 00 (Starting address)
00 08 (Register number)
54 0D (CRC Code)