Rs-232 Connections - Keithley 2701 User Manual

10-32 Remote Operations

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), ready to send (RTS), clear to send
(CTS), and signal ground (GND) lines of the RS-232 standard. Figure 10-11 shows the
rear panel connector for the RS-232 interface and Table 10-4 shows 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).
Figure 10-11
RS-232 interface connector
Rear Panel Connector
Table 10-4
RS-232 connector pinout
Pin #
1
2
3
4
5
6
7
8
9
5 4 3 2 1
9 8 7 6
Description
No connection
TXD, transmit data
RXD, receive data
No connection
GND, signal ground
Not used
RTS, ready to send
CTS, clear to send
No connection
Model 2701 User's Manual