User`s guide

DESCRIPTION
19
2.8.4.4. Expansion port M-BUSD
Pin
No.
Signal
name
Description
Data flow
direction
1 SGND Signal and power supply ground
2 SGND Signal and power supply ground
3 TxRx- M-BUS B (-) Input/Output
4 TxRx+ M-BUS A (+) Input/Output
5 TxRx- M-BUS B (-) Input/Output
6 TxRx+ M-BUS A (+) Input/Output
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!
LUCOM GmbH * Ansbacher Str. 2a * 90513 Zirndorf * Tel. [phone] * Fax. [phone] * www.lucom.de