68
W&T
USB Interfaces
Wiring configuration
The RS422/RS485 termination of the Interface is implemented
as a DB9 plug. The pin assignments for the connector can be
found in the following table as well as on a sticker applied to
the unit.
Display elements
The Interface features two LED’s, with the
Power
LED indicating
correct supply voltage and the
Data
LED data communication
in both directions.
Pin#
Function
1
data out A (-)
2
data in A (-)
3
handshake out A (-)
4
handshake in A (-)
5
signal GND
6
data out B (+)
7
data in B (+)
8
handshake out B (+)
9
handshake in B (+)