RS485 4 Channel Relay Controller, ModBus RTU

Features: 
Board number manually through a DIP Switch placed near RS485 connector.

Required power:
12VDC / minimum 600 mA.

Specifications:
Relays have Normally Open (NO) and Normally Closed (NC) Contacts each capable of switching max:
- 12VDC/15A
- 24VDC/15A
- 125VAC/15A
- 250VAC/10A

Communication Parameters:
8 Data, 1 Stop, No Parity
Baud rate : 9600

MODBUS Commands:
01 (0x01) Read Coils
05 (0x05) Write Single Coil

Coil 0000: Relay 01
Coil 0001: Relay 02
Coil 0002: Relay 03
Coil 0003: Relay 04