Comm Operator Pal is a free tool to test and debug device or application that communicated with RS232, 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(http://www.serialporttool.com/CommOpInfo.htm).