Notifier AFP-2800 - Page 117

Appendix
AFP-2800/2802 Manual – P/N 11249 11-Mar-08 115
Style 7. (Closed loop with isolation modules providing a redundant path for short circuit conditions)
Total Loop, 3810m maximum, 50 Ω resistance maximum.
Maximum of 25 devices between isolation modules (Note: contact Notifier more details)
In style 7, the processor polls the loop from one of the drivers (the B-side). If a failure (short circuit) occurs
between two isolation modules or the A or B ports of the LCM and an isolation module, the shorted section of loop
will be isolated and the processor will poll through both ends. Note that the A and B ports of the LCM also provide
short circuit isolation.
Two wire addressable detector
Addressable moduleBranch A
Branch B
A
+
A-
B
-
B+
To LCM or LEM
STYLE 4
Two wire addressable detector
Addressable module
Loop Out
Loop Return
A
+
A-
B
-
B+
To LCM or LEM
STYLE 6
Two wire addressable detector
Addressable module
Loop Out
Loop Return
A
+
A-
B
-
B+
To LCM or LEM
ISO-X
ISO-X
Isolation module
STYLE 7