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. 09127/59 460-10 * Fax. 09127/59 460-20 * www.lucom.de