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Wiring Instruction
T
he RS-485 Wiring to the
is recommended to be Twisted Shielded Pair as
shown in the diagram. The wire gauge may be;
22 AWG up to 2000 ft.
20 AWG up to 4000 ft.
18 AWG up to 8000 ft.
The RS-485 wiring from the Fire Alarm
Control Panel to the Annunciator(s) must be
point-to-point from the FA Panel to the first
Annunciator, then the next Annunciator, and
so on. No star-wiring or T-tapping is allowed.
Each MR-2306-AT Annunciator Module has
a 120 ohm End-of-Line Resistor on its RS-
485 Output terminals. This is removed on all
except the last wired Module.
The 24 VDC field wiring needs to be of an
appropriate gauge for the number of
annunciators and the total wiring run length.
See the specifications section "Current Drain
for Battery Calculations", and calculate the
maximum current for all Annunciators summed together.
WARNING: Accidentally connecting any of the 24 VDC wires to the RS-485 wiring will result in damage to
the annunciator and/or to the fire alarm control panel to which it is connected.
Total
Maximum
Current for all
Annunciators
18AWG
Amperes
ft.
0.12
1180
0.30
470
0.60
235
0.90
156
1.20
118
1.50
94
1.70
78
MR-2306-AT
Module
Maximum Wiring Run to Last Annunciator
16AWG
m
ft.
360
1850
143
750
71
375
47
250
36
185
29
150
24
125
MR-23006-AT Remote Multiplex Annunciator Panel Wiring and Installation Manual
14AWG
m
ft.
m
567
3000
915
229
1200
366
114
600
183
76
400
122
56
300
91
46
240
73
38
200
61
Max Loop
Resistance
12AWG
0hms
ft.
m
4250
1296
1900
579
850
259
570
174
425
129
343
105
285
87
Ohms
15
6
3
2
1.5
1.2
1.0
3
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