Description:

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1. Onboard mature and stable 8bit MCU and MAX3232 level conversion chip;
2. Communication protocol: support standard Modbus RTU protocol;
3. Communication interface: support RS232/TTL UART interface;
4. Communication baud rate 4800/9600/19200, default 9600bps, support power-off saving;
5. Optocoupler input signal range: DC3.3-24V (this input cannot be used for relay control);
6. Output signal: relay switch signal, support manual, flash-on, flash-off mode, flash-on/flash-off delay base is 0.1 S, the maximum flash-on/flash-off time can be set to 0xFFFF*0.1S=6553.5S;
7. Device address: range 1-255, default 255, support power-off saving;
8. Baud rate, input signal, relay status, device address can be read using software/commands;
9. Onboard 4-way 5V, 10A/250V AC 10A/30V DC relay, can be continuously closed 100,000 times, with diode discharge protection, short response time;
10. onboard relay switch indicator;
11. power supply voltage: DC7-24V,;
12. board size: 93*87mm, board weight: 92g;

Specifications:
Product Name: 4CH Modbus Relay Module
Work voltage: DC 7V~24V
Load: AC 250V 10A or DC 30V 10A
Ptocoupler Input Signal: DC 3.3V~24V
Set address: 1~255
Interface: RS232/TTL UART
Control channel: 4channel
Baud Rate: 4800/9600/19600bps(Default 9600bps)
Weight: 92g
Size: 93*87mm

Features:
1. Support Modbus RTU protocol;
2. Support RS232/TTL UART interface
3. Output indicator in multi mode;
4. Address can be set
5. Support input reverse connection protection
6. Relay switch output;7.Support parameter memory function

Package includes:
1 x 4 CH Relay Module

Only the above package content, other products are not included.
Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.