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3.0
Wiring Instruction
T
he RS-485 Wiring to the
MR-2306-AT Module 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
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.
!
Attention: Accidentally connecting any of the 24 VDC wires to the RS-485 wiring
Table 3
Total Maximum Current
for all Annunciators
Amperes
0.12
0.30
0.60
0.90
1.20
1.50
1.70
will result in damage to the annunciator and/or to the fire alarm control
panel to which it is connected.
Maximum Wiring Run to Last Annunciator
18AWG
16AWG
ft.
m.
ft.
1180
360
1850
470
143
750
235
71
375
156
47
250
118
36
185
94
29
150
78
24
125
Figure 3
Wiring Diagram
14AWG
12AWG
m.
ft.
m.
ft.
567
3000
915
4250
229
1200
366
1900
114
600
183
850
76
400
122
570
56
300
91
425
46
240
73
343
38
200
61
285
Maximum Loop
Resistance
m.
Ohms
1296
15
579
6
259
3
174
2
129
1.5
105
1.2
87
1.0
7
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