PC MMTA: MMTA and Digiboard Configurations

DEVICE=C:\DIGI\XALL.SYS /n:names /b:baud /d:data type /a:a

where:

/n: ---> Defines the naming convention for Digiboard ports

If this switch is omitted, the first port will be named COM3, the second COM4 and so on by default. Regardless of how the ports are named, they must match the AsyncCommPort= settings in each EXTERNAL.INI instance.

/b: ---> Sets the default baud rate to be used with all ports

Since the OS/2 default baud rate for serial ports is only 1200, the switch should be included to obtain better performance. The switch will support up to 38,400 baud; however, more reliable results can be obtained by using rates of 19,200 or less.

/d: ---> Sets the initial data type (parity, # of data bits, stop bit #)

If this switch is not used, all serial ports will be set to even parity, 7 data and 1 stop bit(s). The MMTA requires no parity, 8 data bits and 1 stop bit for asynchronous connections.

/a:a ---> Enables the alternate pin assignment of Carrier Detect (DCD)

This switch will allow an 8-pin RJ45 cable to be used instead of a 10-pin RJ45 cable by re-assigning the Carrier Detect pin from pin 1 to pin 2. Using an 8-pin cable will also eliminate 2 signals, ring indictor (RI) and data set ready (DSR). This switch is not recommended for use with the MMTA, largely because RTS/CTS (hardware) handshaking requires the 2 eliminated signals.

NOTE: Digiboard uses an additional pin assignment for cable shielding (GND) that is not required for the MMTA.