65-2660XL-XX-04 M2A-XL Transmitter
Chapter 8: RS-485 Modbus Output
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45
Ground Jumper
The M2A-XL includes a 2-pin ground header (see Figure 3 on page 11) that is used when the
M2A-XL is used in a Modbus system. Every M2A-XL is supplied with a ground jumper (a
jumper block) installed onto this header. If the M2A-XL isn’t wired into a Modbus system or if it
is wired into one as shown in Figure 10, the ground jumper should be installed. If the M2A-XL is
wired in a Modbus system as shown in Figure 9, the ground jumper should be removed.
Recommended Modbus Wiring
The recommended Modbus wiring for the M2A-XL is illustrated in Figure 9 below. In this
configuration, 5 wires are used for wiring the M2A-XL into a Modbus system. Figure 9 also
illustrates typical alarm device wiring. The ground jumper must be removed in this wiring
configuration.
Figure 9: Recommended Modbus Wiring
Adding an M2A-XL to an Existing M2 Modbus Installation with
Recommended Wiring
An M2A-XL can be wired into an existing M2 Modbus system. The shape of the terminal PCB
will be different but the wiring connections are identical and the ground jumper on the M2A-XL
must still be removed.
Power Supply
Remove Ground Jumper
10-30 VDC
-
+
Modbus Controller
Input
Terminals
D0
D1
Common
See
Detector
Wiring
To
Additional
M2As
C
N
C
NO
AL
A
R
M
1
C
N
C
NO
AL
A
R
M
2
C
N
C
NO
FA
IL
-
S
+
A
B
C
RS
4
8
5
PW
R
/S
IG
R
W
G
B
LE
L
-
S
+
A
B
C
RS
4
8
5
PW
R
/S
IG
R
W
G
B
LE
L
C
N
C
NO
AL
A
R
M
1
C
N
C
NO
AL
A
R
M
2
C
N
C
NO
FA
IL
Remove
Ground
Jumper
See
Detector
Wiring
