First Alert 1501 - Manual (Page 9)

Getting to Know Your 1501 System
Model 1501 User's Manual
5
R EAR P ANEL
① Audio Output
② Video Output
③ Audio Input (1–4)
④ Video Input (1–4)
⑤ DC 12V Power Socket
⑥ USB Ports
⑦ Alarm Input (1-4)
GND:
Ground
NO/COM: Alarm Output
485A/B: PTZ Control +/-
232TX/RR: RS232 connector to PC
+12V, 100 mA connectors to DC power relays
⑧ RJ45, Ethernet 10/100Base-T
1
3
2
4
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