Selecting And Configuring Rs-232 Interface; Rs-232 Connections - Keithley 2750 User Manual

10-20 Remote Operations

Selecting and configuring RS-232 interface

After selecting (enabling) the RS-232 interface, you will then set the baud rate, flow con-
trol, and terminator.
1.
2.
NOTE
3.
4.
5.

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
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).
Press the SHIFT key and then the RS-232 key. The RS 232 ON or RS 232 OFF
message will be displayed.
If the RS-232 is already ON, press ENTER and proceed to step 3. Otherwise, press
the key to place the cursor on OFF, press the
state, and then press ENTER.
Enabling (ON) the RS-232 interface disables (OFF) the GPIB. Disabling the
RS-232 interface enables the GPIB.
To retain the presently displayed BAUD rate, press ENTER and proceed to step 4.
Otherwise, press the
∇
key to display the desired baud rate, and then press ENTER.
To retain the presently displayed FLOW control, press ENTER and proceed to step
5. Otherwise, press the
Δ ∇
the or key to display the alternate flow control setting, and then press
ENTER.
To retain the presently displayed terminator (Tx TERM), press ENTER. Otherwise,
press the key to place the cursor on the terminator setting, use the
to display the desired terminator, and then press ENTER.
shows the rear panel connector for the RS-232 interface, and
Model 2750 Multimeter/Switch System User's Manual
key to place the cursor on the baud rate value, use the
key to place the cursor on the flow control setting, use
Δ ∇
or key to display the ON
Δ
Table 10-2
Δ
or
∇
or key