Introduction
ADM-4280-C is the 8 Channel 0-20mA/4-20mA/0-10V analog signal data acquisition module, which can be widely used in the industrial field device signal acquisition and monitoring. When the "C" in the model is I20, it is the input of the 0~20mA/4-20mA current. When "C" is V10, it is the voltage input of the 0-10V. Analog signal is a single ended input mode, the communication interface is RS-485 interface, supports standard MODBUS-RTU protocol, and can be connected to configuration software, PLC and DCS industrial touch screen.
Specification
Analog signal input
1. Input channel: 8 Channel single end
2. Input range: C=I20: 0~20mA/4-20mA current signal
C=V10: 0~10V voltage signal
3. ADC Resolution ratio: 16 Bit (valid-bit 15bit)
4. Conversion rate: 10 times per second (Full channel)
5. Precision: ±0.1%
6. Sampling resistance: 12R /0.1% (Current), 100K (Voltage)
Communication interface
1. Communication protocol: MODBUS-RTU
2. Interface type: RS-485 interface
3. Interface protection: 600W Surge, 15KV ESD, 1500V isolation protection
4. Baud rate: 1200/2400/4800/9600/19200/38400/57600/115200 bps
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: -10~60 ℃ humidity: 0-95%, not condensing
4. Power supply: DC9~30V is less than 1W
Indicator light definition
1. POWER: power indication, "bright" power supply is normal
2. COMM: RS-485 communication indicates that "flash" sends and receives data
Using the default communication parameters
When you forget the baud rate, parity bit, ID, etc. You can short circuit the INIT and VS-, and then power on. The module will use the initial values (9600, N, 8, 1, ID 1) to communicate with the master station.
When INIT and VS- pin is disconnected, the module will use user-defined parameters to communicate with the master station.
Module register address description
1.30001~30008: analog input register address (3x),
Using 04 function code, address is 0000H~0007H.
2.40001~40008: analog input register address (4x),
Using 03 function code, address is 0000H~0007H.
3.40161~40164: module parameter register address (4x),
Using 03 and 06 function code, address is 00A0H~00A3H.

Example of communication format
Read the 8 channel current input value (16 hex)
Host sending: 01 03 00 00 00 08 44 0C
01 (ID)

03 (Function code)

00 00 (Starting address)

00 08 (Register number)

44 0C (CRC Code)
Module return: 01 03 10 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 E4 59
01(ID)

03 (Function code)

10 (Total bytes)

E4 59 (CRC Code)

8 Groups 00 00 (Current value)

Model definition

ADM-4280-I20:  8 Channel 0-20mA/4-20mA  analog signal data acquisition module

ADM-4280-V10: 8 Channel 0-10V analog signal data acquisition module