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PSR-1, NET-4, NET-7, NET-7M Connections and Ratings
NET-4 Wiring
NET-4
Electrical Ratings:
Supervisory 5V, ±5%
20mA
Alarm 5V, ±5%
20mA
Battery 24V
5mA
NET-7
Electrical ratings:
Supervisory 5V
120mA avg
140mA max
Alarm 5V
120mA avg
140mA max
Battery 24V
30mA
NOTES
1. Power limited to
NFPA 70 per NEC 760.
2. Minimum wire size:
18 AWG.
3. Maximum resistance:
80 ohms total.
4. Use twisted pair or
shielded twisted pair.
5. Terminate the shield
ONLY at the MMB-1/-2
enclosure.
6. Maximum voltage:
8V P-P.
7. Maximum current:
150mA.
End of line resistors:
End of line resistors are provided with
each NET-7. DO NOT PLACE AN END
OF LINE RESISTOR AT EACH NET-7.
These devices are required at the two
extreme ends of each network pair as
shown in the NET-7 Wiring Diagram. It
is not required that the MMB-1/-2 be at
one of the ends. It may be at any
location along the network. T-tapping is
not allowed on the network.
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