T H E M O D E R M - B U S T E C H N O L O Y
3
Ve
rs
io
n E
.3
.0
1.0
0
2.1.2
Connections on the lower 12 pin connector
Figure 2-2
Connections on the lower left 3 pole connector are as stated in the below table:
Table 2-2
Connections on the lower right 9 pole connector are as stated in the below table:
Table 2-3
18
M-Bus Slave 2
Connection to already existing M-Bus loop with belonging M-Bus
master. Polarity independent.
Connection Term
Description
19
24 V AC/DC+ 24V AC power alternatively 24V DC (plus side)
20
24 V AC/DC-
24V AC power alternatively 24V DC (minus side)
21
GND
Connect to decrease potential disturbances.
Connection Term
Description
22
M-Bus
Connection to the M-Bus loop 1
23
M-Bus
Master -
Connection to the M-Bus loop 1
24
M-Bus
Connection to the M-Bus loop 2
25
M-Bus
Master -
Connection to the M-Bus loop 2
26
M-Bus
Connection to the M-Bus loop 3
27
M-Bus
Master -
Connection to the M-Bus loop 3
28
M-Bus
Connection to the M-Bus loop 4
29
M-Bus
Master -
Connection to the M-Bus loop 4
30
X
Not used