74
W&T
USB Interfaces
Wiring configuration
The RS232 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
Direction
1
DCD
input
2
RxD
input
3
TxD
output
4
DTR
output
5
GND
GND
6
DSR
input
7
RTS
output
8
CTS
input
9
RI
input
