CIRCUTOR CMBUS series - Manual (Page 9)

3.3.- UNIT TERMINALS
Table 2: List of unit terminals�
Terminal Description
A A (+) Modbus
B B (-) Modbus
L+ + 24 Vdc
M- GND
Rx RS-232, data reception
Tx RS-232, data transmission
MBUS+ + connection to M-BUS slaves
MBUS- - connection to M-BUS slaves
A B L+
Rx Tx M-
Terminals
MBUS+ MBUS- Terminals
Figure 4: Unit terminals
9 Instruction Manual
CMBUS