Omnitron Systems Technology RS-232 - Manual (Page 52)

Serial Interface Problems
Serial interface problems fall into two primary categories: Incorrect cabling
and incorrect port setup.
Do you have the right cables?
The serial interface has a number of “standard” cables with male female
and 25 or 9-pin connectors. The correct pin-outs for the reader are listed in
Appendix E. Make sure that your cables match these pin-outs and the pin-outs
for your computer or terminal.
Are the communications parameters correct?
The communication parameters (baud rate, data bits, start/stop bits, and
parity) for the reader must match those of the computer or terminal.
Is the data stream overrunning the computer/terminal port?
The reader can continuously transmit and receive data. However, it is possible
that it is exceeding the rate at which the computer/terminal can receive it.
Lower the baud rate of the system and reader, or add interblock delays in
the data stream to give the host system time to process each message as it is
received.
Have you connected the reader to the correct port?
You may have connected the reader to Com 1 and set the parameters for Com
2 or another serial port (or vice-versa).
Have you installed the drivers for USB/RS-232 correctly?
You can check to see if the correct virtual com port has been established for
the reader in Windows Device Manager.
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