RAM-216 Remote Annunciator Wiring and Instruction Manual
3
Wiring Instructions
The RS-485 Wiring to the RAM-216
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.
The RS-485 wiring from the fire
alarm control panel to the
annunciator(s) must be point-to-
point from the fire alarm panel to the
first annunciator, then to the next
annunciator, and so on. No star
wiring or T-tapping is allowed. Each
RAM-216 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. Use the
Current Drain for Battery Calculations
on page 5 to calculate the
maximum current for all annunciators summed together.
Note:
All circuits are power limited and must use type FPL, FPLR, or FPLP power limited
cable.
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
Maximum Wiring Run to Last Annunciator
Max Loop
Resistance
18AWG
16AWG
14AWG
12AWG
0hms
Amperes
ft.
m
ft.
m
ft.
m
ft.
m
Ohms
0.12
1180
360
1850
567
3000
915
4250
1296
15
0.30
470
143
750
229
1200
366
1900
579
6
0.60
235
71
375
114
600
183
850
259
3
0.90
156
47
250
76
400
122
570
174
2
1.20
118
36
185
56
300
91
425
129
1.5
1.50
94
29
150
46
240
73
343
105
1.2
1.70
78
24
125
38
200
61
285
87
1.0
+
24 VDC
OUTPUT
-
S
S
-
+
-
+
-
+
RS-485
OUTPUT
RS-485
INPUT
24 VDC
INPUT
24 VDC POWER FROM FIRE ALARM CONTROL
PANEL OR PREVIOUS ANNUNCIATOR
24 VDC POWER TO
NEXT ANNUNCIATOR
RS-485 TO NEXT ANNUNCIATOR
(TWISTED SHIELDED PAIR)
RS-485 FROM FIRE ALARM OR PREVIOUS
ANNUNCIATOR (TWISTED SHIELDED PAIR)
