The DigiBoard OS/2 User Diagnostics (DGOS2UD.EXE) permits a user
        to functionally test a single comm port. The diagnostics require 
        the use of a loopback connector to test the modem control lines and 
        data transmission/reception. The loopback connectors are available
        through DigiBoard's Customer Service Department (612-912-3456) or
        can be made to the following specification :

                DTR -> DSR, DCD
                RTS -> CTS, RI
                TX  -> RX

        On DB-25 connectors the pinout are as follows :

                Signal      Pin
                ---------------
                TX           2    
                RX           3
                RTS          4
                CTS          5
                DSR          6
                DTR         20
                RI          22

        On RJ-45 connector the pinouts are as follows :

                Signal      Pin
                ---------------
                TX           5
                RX           6
                RTS          3
                CTS          8
                DSR          2
                DTR          9
                RI           1



        The diagnostics can be run in one of two modes, Short Test Mode or
        Continuous Test Mode. In Short Test Mode, the modem control lines
        are tested once and then all combinations of baud rates, data bits, 
        stop bits and parity bits are tested once in a transmit/receive test. 
        In Continuous Test Mode, the same tests are performed except that the 
        transmit/receive test is run repeatedly. The parameters for the trans-
        mit/receive test are as follows :

        Bauds : 110, 150, 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600
        Data Bits : 8, 7
        Stop Bits : 1, 2
        Parity    : None, Odd, Even.