Quick Manual
MST DEMO setup
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b. Connection of the RS 422 interface
1. For LMS 200 / LMS 291
Pin assignment:
LMS
PC
Signal designation
PIN No.
PIN No.
Signal designation
RxD-
1
1
RxD-
RxD+
2
2
RxD+
TxD-
3
3
TxD-
TxD+
4
4
TxD+
GND
5
5
GND
Not connected
6
6
Not connected
Jumper 1
7
7
Not connected
Jumper 2
8
8
Not connected
Not connected
9
9
Not connected
Note:
As there is no standard for RS422 connector pinning, please check the signal
assignments of your RS422 interface card to the respective PINs. Refer to the
documentation of your RS422 interface board manufacturer.
In case of deviations, change the cable assignments accordingly.
For selection of the RS422, there needs to be a jumper connection between between
PINs 7 and 8 on the LMS side inside the cable connector.
PINs 2 and 3 are crossed in the cable, PINs 1 and 4 are crossed in the cable. It is
recommended to use twisted pair cables for RS422 connections.
2. For LMS 211 / LMS 220 / LMS 221
Note:
For selection of the RS422, there needs to be a jumper connection between between
PINs 3 and 11 on the LMS side in the cable connector.
PINs 2 and 3 are crossed in the cable, PINs 1 and 4 are crossed in the cable. It is
recommended to use twisted pair cables for RS422 connections.
Fig.3:
Wiring of the RS232 for LMS211/LMS220/LMS221
