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The purpose of a null-modem cable is to permit two RS-232 "DTE" devices to communicate with each other without modems or other communication devices (i.e., "DCE"s) between them.
This program allows you to check the flow of data through
a computer's COM ports. As you can see from software name this application can work as serial port monitor. It supports full duplex mode, flexible
adjusting of parameters, output received data to file, automatic
and manual modes, free data source, serial device simulation,
plugins and sniffer mode. It is recommended for advanced users
and automation specialists.
COM Port Data Emulator - Emulates a device connected through a COM or an Ethernet port. Generates a traffic for a COM, RS232, TCP/IP device.