Keithley 2651A Reference Manual page 106

Section 2: General operation
RS-232 connector pinout
Pin number
1
2
3
4
5
6
7
8
9
To enable or disable flow control using the RS-232 configuration menu:
1. Press the MENU key, select RS232 > FLOW-CTRL, and then press the ENTER key or the
navigation wheel
2. Select HARDWARE to enable flow control or NONE to disable it.
2-84
Model 2651A High Power System SourceMeter® Instrument Reference Manual
Figure 31: RS-232 interface connector
Description
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
.
RS-232
5 4 3 2 1
9 8 7 6
Rear Panel Connector
2651A-901-01 Rev. A / March 2011