This  graphic  simulation  of  the   concentrator's   front    panel    is
dynamically  updated  at  half  second  intervals,  and  shows the current
status of the channel selected.

Activity   on   the   synchronous   channel   is   indicated    by     the
rotating  "helicopters"   after   the  terms "Sync Packets TxD:" and "Sync
Packets RxD:"  in the upper right-hand corner of the screen.

The inner box shows the state of the RS-232 signals TxD,  RxD,  RTS,  CTS,
DSR, DCD, DTR,  RI,  and  input  and   output flow control states (OFC and
IFC).

An inactive signal is indicated by a dash (-) under its name.

An active signal is indicated by a block under its name.

If data is currently being transmitted  or  received,   a   blinking   "X"
will appear under the signal name (TxD or RxD, respectively).

The status of the concentrator appears at the far right of the inner box;
  DN if the communication to the host adapter is down.
  (AC, 16em, 8em, 8emp, M4em, or M8em) if the connection to the host 
  adapter is good.

Input Modes *Not a standard UNIX flag
    IGNBRK   Ignore Break
    BRKINT   Interrupt on Break
    IGNPAR   Ignore parity errors
    PARMRK   Mark parity errors
    INPCK    Input parity check
    ISTRIP   Strip input characters
    ITOSS*   Toss IXANY characters
    IXON     Enable start/stop output
    IXANY    Restart output on any character
    IXOFF    Enable start/stop input
    IXONA*   Enable start/stop output Auxiliary

Output Modes *Not a standard UNIX flag
    XCASE*   Canonical upper/lower display
    OLCUC    Map lower case to upper
    ONLCR    Map NL to CR/NL
    OCRNL    Map CR to NL
    ONOCR    No CR output at column 0
    ONLRET   NL performs CR function
    OFILL    Use fill characters for delay
    OFDEL    Fill character is DEL; otherwise NUL
    NLDLY    NL delay is selected
    CR1      Carriage Return delay type 1
    CR2      Carriage Return delay type 2
    CR3      Carriage Return delay type 3
    TAB1     Tab delay type 1
    TAB2     Tab delay type 2
    TAB3     Tab delay type 3
    BS1      Backspace delay
    VT1      Vertical tab delay
    FF1      Form feed delay

Control Modes
    Baud Rate   50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400,
                4800, 9600, 19200, 38400.  If Fast Baud is set baud rates
                of 50, 75, 110, 200, 2400 and 4800 are translated to 57600, 
				75600, 115200, 230400, 460800 and 921600 respectively.  
				For parallel ports, the baud rate defines the pulse 
				width of the data strobe.

    Char Bits   5,6,7,8, or None.

    Stop Bits   2,1, or None.

    Parity      Enabled, Odd, or None.

    Fast Baud*  Use fast baud rates.  *Not a standard UNIX flag


LoopBack Test:  If the channel is not on a Modem 4em or Modem 8em, 
                a loopback plug must be installed in the channel to be
                tested.  A loopback diagnostic test can be run against
                any selected channel by pressing the T (or t) key from
                the channel monitoring screen.

                If the channel is on a Modem 4em or Modem 8em, an 
                additional channel is required to do the loopback test
                and a loopback plug is not used.  Select the first
                loopback channel by pressing the T (or t) key from the
                channel monitoring screen.  The next screen presented
                will list the legal choices for the second loopback
                channel and allow a choice to be made.  The two
                selected channels must be connected to each other
                using a standard RJ11 phone cable.

                The loopback plug specification:

                The loopback plug for RJ-45 versions (Digi Int'l Part
                Number 60000401) consists of a single 10-pin RJ-45 plug
                wired as follows:
                   Pin 3 connected to pin 1 and 8 (RTS to RI and CTS);
                   Pin 5 connected to pin 6 (TxD to RxD);
                   Pin 9 connected to pin 2 and 10 (DTR to DSR and DCD).

                For DB-25 versions (Digi Int'l Part Number 60000442), the
                loopback plug consists of a female DB-25 connector wired
                as follows:
                   Pin 4 connected to pin 22 and 5 (RTS to RI and CTS);
                   Pin 2 connected to pin 3 (TxD to RxD);
                   Pin 20 connected to pin 6 and 8 (DTR to DSR and DCD).

                Note: The port(s) must be disabled prior to running the
                      loopback test.

The Print Screen (^P) option invokes a screen dump  to  the  default  file
/tmp/dpalog.   If  another  file and/or path is desired, simply invoke dpa
with the -l option.
        e.g.       dpa -l <logfile>
