[Communication interface]：RJ45, RS485
[Working voltage]：DC 8~28V
[Installation method]：Guide rail/screw
[Introduction]：ME31-XDXX0400 is a PT100 thermal resistor temperature acquisition module with 4-channel PT100 temperature acquisition function, and supports the acquisition of 2/3-wire PT100 temperature sensors. It also has a display screen to facilitate customers to debug and configure on-site and view the temperature. This temperature acquisition module supports both network and RS485 communication interfaces, and supports Modbus TCP protocol or Modbus RTU protocol for acquisition. It can also be used as a Modbus gateway, automatically sending instructions from non-local Modbus addresses through the serial port/network port, supporting Modbus TCP and Modbus RTU protocol conversion, and convenient for expanding Modbus slave devices.
| No. | Label | Description |
| 1 | TX（LED） | Serial port data transmission indicator |
| 2 | RX（LED） | Serial port data reception indicator |
| 3 | LINK（LED） | Network connection indicator |
| 4 | NET（LED） | Network data transmission and reception indicator |
| 5 | PWR（LED） | Power input indicator |
| 6 | PE | Ground, 5.08mm Phoenix terminal. |
| 7 | CH1+ | The first PT100 temperature acquisition channel, 3-wire PT100 positive input, when connected to 2-wire PT100, short the two CH1+ terminals, 5.08mm Phoenix terminal. |
| 8 | CH1+ | The first PT100 temperature acquisition channel, 3-wire PT100 positive input, when connected to 2-wire PT100, short the two CH1+ terminals, 5.08mm Phoenix terminal. |
| 9 | CH1- | The first PT100 temperature acquisition channel, 3-wire PT100 negative input, 5.08mm Phoenix terminal. |
| 10 | CH2+ | The second PT100 temperature acquisition channel, 3-wire PT100 positive input, when connected to a 2-wire PT100, short the two CH2+ terminals, 5.08mm Phoenix terminal. |
| 11 | CH2+ | The second PT100 temperature acquisition channel, 3-wire PT100 positive input, when connected to a 2-wire PT100, short the two CH2+ terminals, 5.08mm Phoenix terminal. |
| 12 | CH2- | The second PT100 temperature acquisition channel, 3-wire PT100 negative input, 5.08mm Phoenix terminal. |
| 13 | CH3+ | The third PT100 temperature acquisition channel, 3-wire PT100 positive input, when connected to a 2-wire PT100, short the two CH3+ terminals, 5.08mm Phoenix terminal. |
| 14 | CH3+ | The third PT100 temperature acquisition channel, 3-wire PT100 positive input, when connected to a 2-wire PT100, short the two CH3+ terminals, 5.08mm Phoenix terminal. |
| 15 | CH3- | The third PT100 temperature acquisition channel, 3-wire PT100 negative input, 5.08mm Phoenix terminal. |
| 16 | Ethernet | Ethernet interface, standard RJ45 interface. |
| 17 | CH4+ | The fourth PT100 temperature acquisition channel, 3-wire PT100 positive input, when connected to a 2-wire PT100, short the two CH4+ terminals, 5.08mm Phoenix terminal. |
| 18 | CH4+ | The fourth PT100 temperature acquisition channel, 3-wire PT100 positive input, when connected to a 2-wire PT100, short the two CH4+ terminals, 5.08mm Phoenix terminal. |
| 19 | CH4- | The 4th PT100 temperature acquisition channel, 3-wire PT100 negative input, 5.08mm Phoenix terminal. |
| 20 | 485-A | The A of the serial port is connected to the A interface of the external device, 5.08mm Phoenix terminal. |
| 21 | 485-B | The B of the serial port is connected to the B interface of the external device, 5.08mm Phoenix terminal. |
| 22 | V- | The negative pole of the power input terminal, DC 8V~28V, 5.08mm Phoenix terminal. |
| 23 | V+ | The positive pole of the power input terminal, DC 8V~28V, 5.08mm Phoenix terminal. |