Raspberry Pi RS232 8 Relay Board

 

Now I'll show you a very easy way how to control RS232 8 relays

with the help of Raspberry PI 

 

Needed 
1 RaspberryPI 

1 RS232 KMTronic 8 Relay Board

1 USB cable 

1 FTDI KMTronic
1 RS232 to TTL converter with MAX232
2 DB9 RS232 Male
12-volt power
recommend install Raspbian
 
 
 
 
 
DB9 RS232 Male to Male
 
 
 
FTDI to RS232 to TTL converter with MAX232
 

 

 
 
Sets baud rate of the USB relay
 
stty -F /dev/ttyUSB0 9600
 
 
 
How to switch on or off the relays
 
Shell code
 
#!/bin/bash
# sends on signal to the USB relay
echo -e "\xFF\x01\x01" > /dev/ttyUSB0   -----> ON 
echo -e "\xFF\x01\x00" > /dev/ttyUSB0   -----> OFF
 
 
 
 
 
 
 
 
 
 
 
 
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