Features:
- ID: 03
- Relays from 17 to 24
- Can be connected up to 32 relay boards to one PC COM Port
(NOTE: if you need to connect more relay boards to one RS485 BUS - all boards must have different ID number)

The complete includes:
- One RS485 to 8 Digitally Outputs controller (12V)
- One 12VDC RELAY board (12V)
- 10PIN flat cable approximate 5cm length

Required power:
12VDC / minimum 400 mA.

Dimensions:
Relay board : 120mm / 80mm / 20mm
RS485 controller : 40 mm / 60 mm

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

Commands:
Relay 17 commands:
OFF command : FF 11 00 (HEX) or 255 17 0 (DEC)
ON command : FF 11 01 (HEX) or 255 17 1 (DEC)

Relay 18 commands:
OFF command : FF 12 00 (HEX) or 255 18 0 (DEC)
ON command : FF 12 01 (HEX) or 255 18 1 (DEC)
...
...
...
Relay 24 commands:
OFF command : FF 18 00 (HEX) or 255 24 0 (DEC)
ON command : FF 18 01 (HEX) or 255 24 1 (DEC)

RS485 BUS exsample: