Expansion Port M-Busd - Lucom ER 75i User Manual

2.8.4.4.
Pin Signal
name
No.
1 SGND
2 SGND
3 TxRx-
4 TxRx+
5 TxRx-
6 TxRx+
7 +12V EXT External power supply
8 +12V EXT External power supply
ATTENTION! External supply is for converter M-BUSD!
If galvanic separation is required the converter must have external power supply.
Circuit example of the equipment with a router with data length less than 10 m:
Circuit example of the equipment with a router with data length more than 10 m:
If an M-BUS data cable more than 10m it is need to use overvoltage protection
on the router side!
19
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Expansion port M-BUSD

Description
Signal and power supply ground
Signal and power supply ground
M-BUS B (-)
M-BUS A (+)
M-BUS B (-)
M-BUS A (+)
DESCRIPTION
Data flow
direction
Input/Output
Input/Output
Input/Output
Input/Output