65
W&T
Subject to error and alteration
USB Interfaces
A GND level signal on Pin 5 of the SUB-D connector will place
the module in half-duplex mode whereby an echo of the sent
signals is suppressed.
Wiring examples
34201
20mA
RxD
+
RxD
-
TxD
+
TxD
-
PC
activ
e
/
passiv
e
20mA
de
vice
Interface
Tx
loop
active,
interface
Rx
loop
passive
1
2
3
4
6
7
8
9
Data
Out
20mA
Data
Out+
Data
Out
-
Data
Out
GND
Data
In
20mA
Data
In+
Data
In
-
Data
In
GND
34201
RxD
+
RxD
-
TxD
+
TxD
-
PC
activ
e
20mA
de
vice
Interface
Tx
and
Rx
loop
passive
1
2
3
4
6
7
8
9
Data
Out
20mA
Data
Out+
Data
Out
-
Data
Out
GND
Data
In
20mA
Data
In+
Data
In
-
Data
In
GND
20mA
34201
20mA
RxD
+
RxD
-
TxD
+
TxD
-
PC
passiv
e
20mA
de
vice
Interface
Tx
and
Rx
loop
active
1
2
3
4
6
7
8
9
Data
Out
20mA
Data
Out+
Data
Out
-
Data
Out
GND
Data
In
20mA
Data
In+
Data
In
-
Data
In
GND
USB
USB
USB
USB
USB
USB
