A: 1. Before connection, connect the SMS pins 1 and 2 with 12-24V DC power. Pin 78 is connected via RS485 communication. Connect the three devices in sequence with network cables from one end to the other, and then connect them to the COM port on the SNMP card (e.g., com-temperature-humidity-water immersion-SMS (where the Phoenix terminals 3 and 4 of the water immersion sensor should be short-circuited)).
2. Connect the SNMP card, enter the device management interface, add the application, and set different addresses (this needs to be done in conjunction with the dip switch settings)
3. Enter the serial communication settings interface and set the baud rate to 9600.
4. Finally, enter the expansion device interface to check if the communication is successful and the functions are normal.