4.3.
Local Signal Control
When configured for Local Signal Control, Switch Modules will
select A/B channels based on the signal level at pin 12 of Port A,
B, or C. When pin 12 is high (+), channel “A” is selected; when
pin 12 is low (-), channel “B” is selected. To configure a Switch
Module for Local Signal Control, proceed as follows:
1. Carefully remove the Switch Module from the RAB-14A
rack and locate the jumpers as described in Figure 3.1.
2. Place Jumper J3 in the “LOCAL” position.
3. Use Jumper J2 to select port A, B or C. The Switch Module
will monitor pin 12 of the selected port and perform A/B
switching based on a high or low signal.
4.
Disable Local A/B Switch (Optional):
To disable the Local
A/B Switch for this Switch Module, remove Jumper J4.
When J4 is removed, the module will continue to respond to
the signal at pin 12, but the Local A/B Switch will have no
effect.
5. Carefully replace the Switch Module in the rack. Place the
Local A/B Switch in the middle position. The “X” LED
should light.
6. Place the Master Select Switch in the middle position. The
“REMOTE” LED should light.
7.
Disable Master Select Switch (Optional):
To disable the
Master Select Switch, carefully remove the Control Module
from the RAB-14A rack unit. The jumper which
enables/disables the Master Select Switch is located on the
logic board, adjacent to the ribbon cable. Set the jumper as
desired and carefully replace the Control Module.
8. When pin 12 of the selected port goes high, channel “A” will
be selected. When pin 12 goes low, channel “B” will be
selected.
4-3
Selecting Switching Methods
