Series 2600 System SourceMeters Reference Manual
Communications Interfaces 11-13
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2600S-901-01 Rev. A / May 2006
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 “
Figure 11-4
RS-232 interface
9 8 7 6
5 4 3 2 1
Rear Panel Connector
RS-232
connector
Table 11-3
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
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