Introduction
ADM-4760 is 6-Channels Pt100/Pt1000 thermal resistance temperature acquisition module. The communication interface adopts RS-485 interface, supports standard MODBUS-RTU protocol, and can be directly connected with configuration software, PLC,DCS, industrial control touch screen, etc.
Specification
(1)Analog signal input
1. Input Channel : 6-Channels
2. Input Type: Pt100 / Pt1000 Thermal Resistance
3. Input Range: Pt100: -200~+650℃, Pt1000: -150~+550℃
4. Convert Rate: Low speed mode: 1 times/s , High speed mode: 10 times/s
5. Resolution: 16bit ADC
6. Acquisition precision: Low speed mode ±0.5℃, High speed mode ±1℃
7. Compensation: Automatic line resistance compensation
8. Convert Rate setting: Low speed mode or high speed mode can be set
9. Signal type setting: Each channel can be independently set as Pt100 or Pt1000and can be closed
(2)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)
(3)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: Less than 1W @ 24VDC
(4)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
The default communication parameters of the module are Baud rate=9600, Data bit=8, Parity bit=None, Stop bit=1, Slave ID=1. The user can change Slave ID, Baud rate and Parity bit.
There is a user parameter area and a default parameter area inside the module. The user parameter area stores the communication parameters modified by the user, and the default parameter area stores the default communication parameters (9600, 8, N, 1, Slave ID=1). When the module starts normally, the module loads user parameter area to communicate after startup. When users forget the modified communication parameters, Short circuit INIT to AGND before module power supply or press and hold the switch on the side of the module before module power supply (release it 1 second after module startup), and the module loads the default parameters to communicate. At this time, the user can read the user parameters area to view the user parameters.
Module register address description
1.30001~30006: analog input register address (3x),
Using 04 function code, address is 0000H~0005H.
2.40001~40006: analog input register address (4x),
Using 03 function code, address is 0000H~0005H.
3.40160~40165: module parameter register address (4x),
Using 03 and 06 function code, address is 009FH~00A4H.