Package inlcuded:
DC 12V 2Ch RS232 Relay Board(DB9 Female/Male Interface)

Description:
2 Ch DB9(Female/Male) RS232 Relay Module;
Power input: DC 12V(8.5-13.5V).
PC Serial ports RS232 Control Relay;
Power indicator : LED lights;
Output indication : relay output with LED indicators,easy to see working status of the relay;
Communication protocol: UART protocol communication, baud rate 9600kpbs, 8 data bits, one stop bit, no parity. Each data frame contains eight bytes. Two-way data transmission.
Baud rate 9600kbps, 8 data bits, one stop bit, no parity. Each data frame contains eight bytes.
PCB Size : 71x47mm

Note: There are two types of DB9 interfaces.Female interfaces usually are common. Please choose the correct DB9 interface.

1 Control commands:
1. Reading status(reading the satus of the relay (on/off))
0x55 0x56 0x00 0x00 0x00 0x00 0x00 0xAB

2.Relay open (issue this command,Relay open,COM connect to NO)