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Connecting to a Personal Computer RS232 port
Figure 3 – Personal Computer / RS232 port connections
The USG-1 can be connected to a PC communications port
using a cable conforming to the following specification:
1. A D-type female (socket) connector for the PC end of
the cable
2. A minimum of 3-cores are required in a shielded
cable. Higher quality cable will naturally yield higher
performance / higher Signal-to-Noise Ratio (SNR).
Most typical cables have two twisted pairs inside. In
this case, use one pair for the
TX
line and one for the
RX
line. Use the spare wire in each pair as ground,
and connect the cable shield to ground only at the
computer end.
3. The
OUT A+
of the USG-1 should be connected to
the
RX
of the computer (standard D-type, pin 2) and
the USG-1
IN A+
should be connected to the
TX
of
the computer (pin 3).
4.
Connect the IN B- and OUT B- together
and connect
to the PC’s serial port ground (pin 5).
Do not
connect
Personal
Computer
( 9 PIN 'D'
RS232
Port)
RX
Pin 2
GND
Pin 5
TX
Pin 3
Connecting to a 3-pin RS485 Listener
Figure 4 – RS485 port connections
The USG-1 ISO-Drive output can be connected to an
RS485 Listener that requires differential drive plus ground
as shown in figure 4.
RS485
Listener
A/+
GND
B/-
Summary of Contents for USG-1-B-422
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