COMM(4)                 COMMAND REFERENCE                 COMM(4)



NAME
     comm - serial port driver for UTek workstations

     For 4310 series UTek products only.

DESCRIPTION
     Comm is the driver on the UTek workstation that provides a
     terminal interface, as described in tty(4), on the RS-232-C
     connector.

     The RS-232-C interface on a UTek workstation is a male
     connector implementing a Data Terminal Equipment (DTE)
     interface.  The following pins are connected:

Pin   Dir    Name            Description                     Comment
_______________________________________________________________________________
 1           PGND            Protective GrouND               tied to pin 7
 2    out    TxD             Transmitted Data
 3    in     RxD             Received Data
 4    out    RTS             Request To Send                 asserted when open
 5    in     CTS             Clear To Send                   hangup if not on
 6    in     DSR             Data Set Ready                  not used
 7    SGND   Signal GrouND   tied to pin 1
 8    in     DCD             Data Carrier Detect             not used
11    out    sRTS            secondary Request To Send       not used
12    in     sDCD            secondary Data Carrier Detect   not used
15    in     TxC             Transmit Clock                  not used
17    in     RxC             Receive Clock                   not used
19    out    sRTS            secondary Request To Send       not used
20    out    DTR             Data Terminal Ready             asserted when open

     The five pins listed as not used are mentioned because some
     equipment may be sensitive to loads or signals on those
     pins.  The description sRTS is normally connected to pin 19,
     although a jumper on the board may connect it instead to pin
     11.  Pin 11 is otherwise not connected.

     The remaining pins are used in their conventional sense.
     When /dev/tty00 is closed, RTS and DTR are off.  When it is
     opened, RTS and DTR are turned on.  The open will then wait
     until CTS is asserted.  Once CTS is asserted, normal
     terminal operation proceeds until the device is closed or
     CTS is dropped. The close will drop RTS and DTR.  If CTS is
     dropped, the signals SIGHUP and SIGCONT are sent to the
     process group.

     In order to connect a terminal or printer to the comm port a
     null modem adapter must be used.

FILES
     /dev/tty00   RS-232 serial device.




Printed 4/7/89                                                  1

COMM(4)                 COMMAND REFERENCE                 COMM(4)



SEE ALSO
     tty(4).





















































Printed 4/7/89                                                  2

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