Product introduction
ADM-4184 is a 8 Channel digital input and 4 Channel (normally open) relay output module, which is used in industrial field signal acquisition, monitoring and control. Support 8 channel isolation digital input and 4 channel A type relay output. RS-485 communication interface, support the MODBUS RTU protocol, can connect configuration software, PLC, DCS industrial control touch screen.
Product specification
Digital input
1. Input channel: 8 Channel 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 (0~65535)counter, input frequency less than 200HZ
Digital output
1. Output channel: 4 channel A type (often open) relay output
2. Load voltage: 0~250VAC or 0~30VDC
3. Load current: 3A
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: 124.9mm x 71.5mm x 34.1mm
2. Installation: 35mm din rail installation
3. Environment: temperature: -20~70 C humidity: 0-95%, not condensing
4. Power supply: DC9~30V, less than 3W
LED directive definition
1. POWER: power status indication, "bright" power supply is normal
2. COMM: RS-485 communication indicates that "flash" is sending and receiving data
3. DI0~DI7: digital input indicator, "bright" digital input is 1
4. RO0~RO3: relay output indication, "bright" relay RO and COM closure
Using the default communication parameters
When you forget module communication (ID, baud rate, parity bit), the INIT and VS- pins are short circuited, module electrifying, The communication parameters of the module are (9600, N, 8, 1), ID is 1.INIT and VS- pin is disconnected, module using parameters set by the user, default parameters for the module (9600, N, 8, 1), ID is 1.

Module register address description
1.10001~1008:
Digital input register address (1x) uses the 02 function code 0000H~0007H
2.00001~00004:
Relay output register address (0x) uses 01 and 15 function code 0000H~0003H
3.40161~40164:
Module parameter register address (4x) uses 03 and 06 function code 00A0H~00A3H
4.40001~4008:
Counter value register address (4x) uses 03 and 16 function code 0000H~0007H
5.40033~40040:

Counter mode register address (4x) uses 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 78 0F
01    (ID)         02 (Function code)
00 00 (Start address)   00 08 (Register number)
78 0F (CRC code)
Module return：01 02 02 00 00 B9 B8
01 (ID)          02 (Function code)
02 (Number of bytes)       B9 B8 (CRC Code)
00 00  ("0" is no digital input,high 4 bits ineffective and low 12 bit effective）
2. Write the output value of the 4 channel
Host sending：01 0F 00 00 00 04 01 03 7E 97
01 (ID)        0F (Function code)         00 00 (Start address)
00 04 (Register number)    01 (Number of bytes)
03 (the value of the write, 03 for RO0-RO1 output 1, RO2-RO3 output 0)
7E 97 (CRC Code)
Module return：01 0F 00 00 00 04 54 08
01 (ID)    0F (Function code)    00 00 (Start address)   00 04 (Register number)
54 08 (CRC Code)
3. Read the counter value of the 8 channel digital input
Host sending： 01 03 00 00 00 08 45 CF
01 (ID)         03 (Function code)         00 00 (Start address)
00 08 (Register number)    45 CF (CRC Code)
Module return：01 03 18 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  6C F4
01(ID)    03(Function code)     18(Number of bytes)  6C F4 (CRC CRC Code)
8 groups 0000(8 channel counter values)