2.6.2
Serial Status Filter
The serial status filter bit is the second input/output key. It
allows status communication to go out serial port 1. When
this bit is turned off, serial status communication cannot
leave serial port 1. This programmable aspect is important
when controlling multiple enclosures from an external device
because it allows the external controller to retrieve status. To
avoid problems with linked enclosures, serial status commu-
nication does not leave serial port 2.
2.6.3
16x16 Front Panel Attached
The 16x16 front panel attached bit is the third input/output
key. This bit alerts the CPU when a 16x16 front panel is at-
tached to the enclosure.
2.6.4
Sync Board Enable
Section 4.1, “Vertical Interval Sync Expansion Boards,” con-
tains a complete explanation of sync boards and suggested
applications. If an enclosure contains a sync board, the sync
board enable bit must be on for the sync board to work. Only
turn this bit on if the enclosure contains a sync board.
Note:
If this bit is on and the enclosure does not contain a
sync board and a provided sync source, the distribu-
tion matrix will not perform switches although it will
appear to operate normally without an error reported.
2.6.5
Serial Port 1
Serial Port 1 operation is controlled by the sixth programma-
ble key. The setting for the serial port should be 0, or off,
unless you are using SBCs. If you use SBCs with the distri-
bution matrix, you must enable polling for serial port 1 and
set the polling range. The CPU polls the SBCs for any switch
request. If the CPU finds a change, that switch is made im-
mediately. Refer to section 2.6.7, “Single Bus Controller
(SBC) Polling Limit.”
2.6.6
Serial Port 2
Serial Port 2 operation is controlled by the seventh program-
mable key. This bit works the same way as the Serial Port 1
bit, except Serial Port 2 cannot be used with SBCs. Serial
Port 2 does not echo commands and is not recommended for
use with any external controllers. Serial Port 2 is usually
used for looping down to another enclosure in multi-enclosure
distribution matrices.
2-7
Operating the Distribution Matrix
