65-2649RK-CH4-4 M2A Transmitter Operator’s Manual
19
Figure 8: Wiring the M2A Junction Box to a Controller and Alarm Devices
3. Re-install the control PCB (and ribbon cable if necessary). Be sure the ribbon cable is routed down below
the control PCB so it will not be damaged by the cover when it is screwed back on.
4. Secure the M2A junction box cover to the junction box.
5. Make controller, device, and relay connections as appropriate. If shielded cable is used for the PWR/SIG
connections, connect the cable shield’s drain wire to an available chassis ground at the gas monitoring
controller, recording device, or programmable controller.
Alarm Device
Power
Typical Alarm
Wiring Shown
Fail Alarm
Device
Alarm 1
Alarm Device
RKI Controller
Terminals
(24 VDC) +
4 - 20 mA In (S)
(24 VDC) -
Alarm 2
Alarm Device
See
Modbus
Wiring
-
S
+
A
B
C
RS
4
8
5
PW
R
/S
IG
R
W
G
B
LE
L
See
Detector
Wiring
C
NC
NO
AL
A
R
M
1
C
NC
NO
AL
A
R
M
2
C
NC
NO
FA
IL
