Rs232 setup TRB255

Hi, I am testing this modem for use with Campbell Scientific data loggers. The program outputs rs232 serial strings to serial modems either at standard voltage levels or TTL voltage depending on which output port is used. The program simply sends AT commands this way to send data and FTP’s.
I am having no luck in using the rs232 on the modem to send AT commands and have tried many variations of settings through the serial utilities configuration page in RutOS.
I also cannot connect to a serial console (ie. minicom) to try and send it AT commands manually having tried standard and hardware flow configurations.
Can anyone enlighten me on how to setup the rs232 input into the modem so as to be able to take AT commands from data loggers and/or how to connect a serial terminal program to the same input to view/send commands to test operation?
Thanks

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