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10-20
RS-232 connections
The RS-232 serial port is connected to the serial port of a computer using a straight-
through RS-232 cable terminated with DB-9 connectors. Do not use a null modem cable.
The serial port uses the transmit (TXD), receive (RXD), and signal ground (GND) lines of
the RS-232 standard. It does not use the hardware handshaking lines, CTS and RTS.
Figure 10-4
the pinout for the connector.
If your computer uses a DB-25 connector for the RS-232 interface, you will need a cable
or adapter with a DB-25 connector on one end and a DB-9 connector on the other, wired
straight through (not null modem).
Model 2790 SourceMeter
shows the rear panel connector for the RS-232 interface and
Figure 10-4
RS-232 interface connector
5
4
9
8
Rear Panel Connector
Table 10-2
RS-232 connector pinout
Pin number
1
No connection
2
TXD, transmit data
3
RXD, receive data
4
No connection
5
GND, signal ground
6
Not used
7
RTS, ready to send
8
CTS, clear to send
9
No connection
1
CTS and RTS are not used.
®
Switch System Reference Manual
3
2
1
7
6
Description
1
1
Table 10-2
shows
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