Focus on RS232 Serial Port & Network communication software.
Comm Operator Pal

Comm Operator Pal is a free tool to test and debug RS232 devices that communicated with serial port, TCP/IP, UDP and HTTP.
It supports data in Text, Decimal and Hex format. Data can be sent in list automatically. Single data can be sent repeatedly. It has built in check-sum calculator.
Comm Operator Pal data file (*.cop) is created by Comm Operator.
COP file can be Run in command line to send data automatically.

Here are some sample files to test relay controller boards for National Control Devices. 
Description COP File Zip File
Commands for ProXR series relay controller boards. ProXR.cop ProXR.zip
Commands for AD12 ProXR series relay controller boards. ProXR-AD12.cop ProXR-AD12.zip
Commands for AD ProXR series relay controller boards. ProXR-AD.cop ProXR-AD.zip
Timer Commands for ProXR series relay controller boards. ProXR-Timer.cop ProXR-Timer.zip
Commands for R1X/R2X relay controller boards. R1X-R2X.cop R1X-R2X.zip
Commands for R4X/R8X relay controller boards. R4X-R8X.cop R4X-R8X.zip

Note: If Comm Operator Pal has been intalled, you only need downoad COP file and click it to test. Otherwise, you can download Zip file, run CommOpPal.exe directly to test the specific relay board.