Modbus RTU Digital I/O RS485 Board – 16DI/16DO/8DI-8DO/4DI-12DO/12DI-4DO Selectable for Arduino ESP32 ESP8266 PLC Smart Home

1 Power supply1: DC 6-25V(anti-reverse);Power supply2: DC 4-5V(reverse connection prohibited)

2 Working current: 5.6MA

3 MODBUS RTU function codes: Write 05/06/15/16, Read 01/02/03

4 Five function IO modes can be selected by jumper: 16DI/16DO/8DI-8DO/4DI-12DO/12DI-4DO

5 By modifying the 0X00F5/0X00F6 register, the input and output levels (NPN/PNP) can be switched

6 By setting the 0X00F3 register, you can restart when communication is abnormal.

7 By setting the 0X00F4 register, you can close all output ports when communication is abnormal.

8 Input mode: Support 3.3V/5V TTL level input, there are two input modes of low level input (default) and high level input

9 Output mode: 5V TTL level, low level (default) / high level output

10 In MODBUS command mode, it can support up to 247 devices in parallel

11 Input port status supports query (default) and automatic reporting

12 Baud-Rate:1200 2400 4800 9600(default) 19200 38400 57600 115200, None/Odd/Even Parity

13 2.54MM pin header interface, easy to use Dupont wire or breadboard connection

14 Size: 51*26*3.8mm(Very Small)
15 Weight: 6grams(Very Light)