RS232 comports are setup with the device command by setting the type attribute to "serial". Currently, RS485 and RS422 devices require a RS232-RS485 convertor. Direct support for 422 and 485 systems is under development. Contact Green Eyes for a status report.
Many PCs today do not come with a built in serial port, so many companies offer USB to one or multiple serial port converters. Green Eyes' staff has used a variety of these devices and has found those offered by Moxa to be extremely reliable.