CommScope ATC300-2000 - Manual (Page 24)

Section 1–System Description ATC300-1000/2000 Teletilt ® RET System
1-8 August 2014 Bulletin 639544 • Revision L
Alarm Outputs:
The ATC300-1000/2000 controller has two relay outputs for conveying alarm conditions. These con-
tacts are specified for +24 Vdc maximum voltage with a maximum load of 1 Amp. The connector is
equipped with a 4-pin terminal block (Figure 1-10). Pin assignments are shown in Table 1-1.
Pin Number Pin Name Description
1 C-1 Relay-1 Center contact
2 NO-1 Relay-1 Normally-open contact
3 C-2 Relay-2 Center contact
4 NO-2 Relay-2 Normally-open contact
Table 1-1. ATC300-1000/2000 Alarm Output Pin Assignments.
Pins 1 and 2, shown to the left in Figure 1-10, are used for major alarms. These will close in the event
there is a major alarm and will cause the Alarm LED to light up. Pins 3 and 4, shown to the right in
Figure 1-10, are used for minor alarms. See Appendix D for definition of alarm conditions.
1.2.1 Modem Port Isolation (ATC300-2000 only)
The ATC300-2000 hardware provides port isolation from overcurrent conditions. The unit has three
modem ports, each providing RS485 capability to a pair of external SMB ports. The AISG port is
also isolated from the modem ports. If a short is detected on the AISG bus, the ATC300-2000 will
remove power to only the affected modem or AISG port, leaving the other ports operational.
Figure 1-10. ATC300-1000/2000 Alarm Outputs.
Remove the 4-pin connector from the controller chassis and connect the alarm outputs as required
by the alarming setting at the installation site.