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15-10
Return to
2600AS-901-01 Rev. B / September 2008
Section 15: Communications Interfaces
Series 2600A System SourceMeter® Instruments Reference Manual
Figure 15-4
RS-232 interface connector
To enable or disable flow control, use the RS-232 configuration menu. Select
HARDWARE
to
enable flow control, or
NONE
to disable it.
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), CTS and RTS (if flow control is enabled), and signal ground
(GND) lines of the RS-232 standard.
shows the rear panel connector for the RS-232
interface, and
shows the pinout for the connector. The connector location is shown in
.
If your computer uses a DB-25 connector for the RS-232 interface, you will need a standard cable
or adapter with a DB-25 connector on one end and a DB-9 connector on the other. An available
RS-232 cable from Keithley Instruments is listed in
in Section 1.
provides pinout identification for the 9-pin (DB-9) or 25-pin (DB-25) serial port
connector on the computer (PC).
Table 15-3
RS-232 connector pinout
Pin number
Description
1
2
3
4
5
6
7
8
9
Not used
TXD, transmit data
RXD, receive data
Not used
GND, signal ground
Not used
RTS, ready to send
CTS, clear to send
Not used
9 8 7 6
5 4 3 2 1
Rear Panel Connector
RS-232