!
Notes
• Connection via safety isolating transformer.
• The wiring of the line for BACnet MS/TP / Modbus RTU is to be carried out in
accordance with applicable RS485 regulations.
• Modbus / BACnet: Supply and communication are not galvanically isolated.
Connect earth signal of the devices with one another.
Wiring diagrams
BACnet MS/TP / Modbus RTU
1
2
3
5
6
7
C2
C1
+
~
–
T
AC/DC
24
V
D+
D
–
1
2
3
5
6
7
C2
C1
+
~
–
T
AC/DC
24
V
GND
Cable colours:
1= black
2 = red
3 = white
5 = orange
6 = pink
7 = grey
BACnet / Modbus signal assignment:
C1 = D– = A
C2 = D+ = B
Connection with passive sensor, e.g. Pt1000, Ni1000, NTC
1
2
+
~
–
T
3
5
6
7
Ni1000
PT1000
NTC
–28...+98°C
–35...+155°C
–10...+160°C
1)
850...1600 Ω
2)
850...1600 Ω
2)
200 Ω...60 kΩ
2)
MFT
C2
C1
D–
D+
1) depending on type
2) Resolution 1 Ohm
Connection with active sensor, e.g. 0...10 V @ 0...50°C
1
2
+
~
–
T
3
5
6
7
MFT
C2
C1
D–
D+
Possible voltage range:
0...32 V (resolution 30 mV)
Connection with switching contact, e.g. Δp monitor
1
2
+
~
–
T
3
5
6
7
∆p
MFT
C2
C1
D–
D+
Requirements for switching contact:
The switching contact must be able
to accurately switch a current of 16
mA @ 24 V.
GM24A-MOD
Rotary actuator, modulating, communicative, hybrid, AC/
DC 24 V, 40 Nm
Electrical installation
www.belimo.com
GM24A-MOD • en-gb • 2020-04-21 • subject to changes
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