GTT Canoga C924 Series, Installation Manual, Page: 12 / 81

Canoga™ Vehicle Detectors
Canoga™ C924X Series Installation Manual
6 – Hardware Installation
3.2.1 Switch/Call Outputs
The structure of the channel switch/call outputs is indicated in Figure 3-1 Switch/Call Output
Structure below. The + terminal of each output must be connected to the more positive of the two
Connect the outputs only to load configurations that meet the requirements stated in Section 8.2
Vehicle Detector Specifications on page 65.
Figure 3-1 Switch/Call Output Structure
3.2.2 Disturbance/Status Outputs
The structure of the channel disturbance/status outputs in C924X units is indicated in Figure 3-2
C924X Channel Disturbance/Status Output below. The + terminal of each output must be connected to
the more positive of the two load terminals. Pin A is the internal DC supply common conductor of the
vehicle detector.
7, 20, 16, 22
A
Channel
Disturbance
Signal External
+
-
Figure 3-2 C924X Channel Disturbance/Status Output
3.2.3 Optional Synchronized Vehicle Detector Rack Wiring
To use the Synchronization feature of the C924X vehicle detectors, the card rack connectors that
receive vehicle detectors must be wired as follows:
For C924X
1. All number 1 contacts (Synchr. Conduct. 1) must be bussed on the card rack.
2. All number 2 contacts (Synchr. Conduct. 2) must be bussed on the card rack.
3. All A contacts (0 VDC reference) must be bussed on the card rack.
See Table 3-1 C924X Vehicle Detector Card-Edge Connector Contact Assignments on page 10 for card
rack connector pin assignments.
Warning! The edge connector contacts on C924X units that have the SYNC I/O lines, pin 1 and pin 2,
are specified as GREEN input lines on NEMA vehicle detectors. If the inputs to any load switches are
connected to edge connector pins 1 and 2, remove those connections. Failure to do so may interfere
with load switch control and cause a controller cabinet conflict monitor or malfunction management
unit to place the intersection into flash.