Black Box PI750A, Manual

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MULTIPORT SPOOLER VIII (4-, 8-, and 12-Port Models)
8.3 Non-Error Display Codes
When the Multiport Spooler VIII is being used, the LEDs on its front panel
flash. This section explains what the flashing lights indicate. If they flash in a
way different from those described here, the Multiport Spooler VIII may be
signaling an error.
Input Ports
The port LED of a parallel input port or a serial bidirectional port used for
input flashes
slowly when receiving a command and quickly when receiving a
task. If you reserve a peripheral, the port LEDs of both the computer and
peripheral flash until you cancel the reservation.
Output Ports
The port LED of a parallel output port or a serial bidirectional port used for
output stays on until its buffer is empty, or if transmission has not been
completed, or the timeout on the ports has not expired. (Timeouts for output
ports are required only if two or more Multiport Spooler VIIIs are connected
together; see
Section 7.4 .) The LED of a reserved port flashes until you cancel
the reservation. If a job sent to the port is on pause, the port’s LED flashes
with an interval of several seconds.
Buffer Full
If the Multiport Spooler VIII’s buffer becomes full, all of the port LEDs flash
until space becomes available. Note that when the buffer is full, the transfer
of data is substantially slower than normal.
Restoring the Default Parameters of Port 1
If you are having difficulties communicating with the Multiport Spooler VIII,
perform the following procedure:
• Connect your PC-to-MPS-VIII cable to MPS-VIII port 1.
• Turn the unit on; when the port LEDs flash sequentially, turn the unit off
and back on.
Port 1’s LED will flash red once every second. The communication
parameters of port 1 have been reset to their defaults: 9600 bps, no parity, 8
data bits, and 1 stop bit. The LED will continue to flash red until you send the
Multiport Spooler VIII a command.