65-2619RK-CH4-4 M2 Transmitter Operator’s Manual
6
control PCB with a ribbon cable. A 5 position connector on the left side of the terminal
PCB is used by factory or field service personnel to program the M2. A factory adjust pot
just above the programming connector is used to set the detector current.
Power/Signal Terminal Strip
The power/signal terminal strip is a three position plug-in style terminal strip located at
the top of the left terminal column. It is used to connect 24 VDC power to the M2 and to
connect the 4 - 20 mA output signal to a device.
The signal output, the S terminal, does not have to be connected for the M2 to function.
The S terminal is used if you want to connect the 4 - 20 mA output signal to another device
such as a gas monitoring controller, chart recorder, or programmable controller (PLC).
Detector Terminal Strip
The detector terminal strip is a four position plug-in style terminal strip and is the middle
terminal strip in the left terminal column. All four terminals are used to connect the
detector to the M2.
Figure 3: Detector Terminal Strip
NOTE:
The detector is factory-wired to the M2. See “Wiring the M2 Transmitter” on
page 11 for all wiring procedures related to M2.
Modbus Terminal Strip
The Modbus terminal strip is a three position plug-in style terminal strip and is the
bottom terminal strip in the left terminal column. It allows connection of the M2 into a
Modbus network.
Relay Terminal Strips
The right column of terminal strips consists of, from top to bottom, the fail, alarm 1, and
alarm 2 relay terminal strips. They are three-position plug-in style terminal strips. The
relay terminal strips are used to connect devices such as lights and horns that are
controlled by the relay contacts. The relay contacts are rated at 115 VAC, 5 amps. The relay
contacts may also be used to control higher rated relays.
FA
IL
-
S
+
PWR
/S
IG
C
NC
NO
A
B
C
AL
AR
M
2
RS
4
8
5
PW
R
/S
IG
-
S
+
LE
L
Detector
Terminal Strip
RS
4
8
5
A
B
C
R
W
G
B
C
NC
NO
LE
L
AL
AR
M
1
C
NC
NO
R
W
G
B
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