With RS232Controlled 8 Relay Board you can control upto 8 SPDT (Single Pole Double Throw) relays using a simple RS232 protocol. 

• Upto 8, 12V SPDT relay control
• Industry standard relay drive IC - ULN2803
• LED indicator to display relay state
• Power-On LED indicator
• Onboard regulator IC
• Screw terminal type connector for easy connection of all wires to the PCB
• Simple RS232 Protocol
• Can be controlled either by a microcontroller board or via PC using RS232 Port
• Diode protection against reverse polarity connection
• NC-C-NO pin outs from each relay into a screw terminal connector
• Windows based interface – works with 2000, ME and XP

Kits With Windows based softwear and RS232 Data Cable

THE WINDOWS BASED SOFT WEAR GUI