12V 50mA Modbus Remote IO 4 Channel Relay Output Acquisition Modem

Modbus Protocol Remote IO Module 4 Channel Relay Output Acquisition Modem

Parameters of ZHT4400

• Introduction​ of ZHT4400

ZHT4400 is a serial port control module that provides 4 DI, 4 DO and a RS485 interface, support the standard Modbus RTU protocol, support dry wet node detection, support relay delay shut down after opening, we provide comprehensive technical supports. It can be widely used in pump control, access control monitoring, lighting control, such as valve monitor application scenario.

Relay wiring instruction: 

The ZHT4400 output adopts a single normally open relay, and the user can control the on and off of the peripheral circuit by controlling the relay to open/close.
DI input wiring method
ZHT4400 has 4 switch alarm inputs, which can be connected to infrared alarm switches, proximity switches, access switches and other equipment.
ZHT4400 is divided into dry node and wet node input circuit.
Note: The device defaults to the dry node version. If you need a wet node, please consult customer service or leave a message.

Features:

DC9~36V wide voltage
Dual watchdogs, stable operation without downtime for 24 hours
Relay output contact isolation
Dry and wet node detection
Support RS485 communication
Communication baud rate: 1200; 2400; 4800; 9600; 14400; 19200; 38400; 43000; 57600; 76800; 115200; 128000; 230400; 256000; 460800; 921600 (can be modified by software, default 115200)
Communication protocol: Support Modbus RTU protocol
01-30 device addresses can be set, and 1-30 address codes can be set with the 5-digit address dial switch

• Function​ of ZHT4400

ZHT4400 supports modbus RTU, a question-and-answer communication method, which is simple, versatile and easy to use. Using rs485 communication network, the on-site switch status can be feed back to the host and the on-site switch valve can be controlled through this module