Advanced Visual Solutions AV102SS Installation And Operating Instructions Manual page 11

USING MASTER/SLAVE COMBINATION
NOTE:- The wires on the push-to-call switch MUST be connected across the OUTER
terminals (Normally Open Contacts) of the switch or the unit will not work!
Install cables for unit A according to the cable specifications in this manual.
Install the cables from unit A to unit B according to the cable specifications in this manual.
There is no need for a second AVPSU4 for unit B, as the switcher card in unit A provides
the power supply and interfacing.
If the switching card PCB is less than a revision 3 version, the call outputs from the
PCB (unit A and unit B) are marked incorrectly on the PCB's silk-screen. i.e. the terminals
marked "A CALL" and the terminals marked "B CALL" are reversed. These terminals have
been re-labelled at the factory and the drawing below shows the correct layout.
Switching
PCB
DOCUMENT NUMBER AV102SS/OEM/01 REVISION 6.1 1st August 2006 Page 10 of 22