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The USB to RS-422 converter will create a COM port on your computer. You may find many data loggers in Internet.
I have used this application in the past: https://www.aggsoft.com/serial-data-logger.htm
It can send requests to a device and log to files.
It seems that you mean RS232-TTL signals. These lines cannot be directly connected to the standard RS232 port.
You may use any TTL-to-RS232 level converter. Or RS232-TTL to USB.
It depends on your needs. If you want to see that you VB program sends and receives on the COM port then you may use any serial port monitor (Advanced Serial Port Monitor for example).
Otherwise you may use the following program. It may split one COM port to two new virtual COM ports...
Also AGG Software's Advanced Serial Port Monitor can be useful for you, because allows not only capture data in the sniffer mode, but allows to send commands to the RS232 device in the manual mode.
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Helen
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