Unitec Portal Installation Manual - Manual (Page 32)

P O R T A L T I
Portal Installation Manual Rev C 28
Figure 22. Intercom Component Locations on the Display IO Board
3.8.4 Connection Overview
Call Function: A view of the diagram below shows J34 and J35. The unit will initiate
a call function by closing the contacts on RL5. By default, J34-Pin 1 (H1) and J34-Pin
2 (H2) will always reflect the contact closure of RL5. This is the default for the four-
wire mode when both the call function and audio are completely separated. More
detailed instructions on this follow.
Audio: When the Portal intercom mode is active, the audio section is floating and is
not relative to ground. By default, J34-Pin 3 (SP+) and J34-Pin 4 (SP-) will always be
connected to the audio section.
Four Wire Intercom Configuration: Two separate pairs (four wires) are used for
both the call function and audio in the four-wire configuration. In this mode, J35
receives no jumpers. This is shown below.
Document #: PTL1001