Gpib Operation; Gpib Standards - Keithley 2500 User Manual

Models 2500 and 2502 User's Manual
The RS-232 interface is a serial interface. Programmable aspects of this interface include
the following (factory default settings are shown in parentheses):
• Baud rate (9600)
• Data bits (8)
• Parity (none)
• Terminator (CR)
• Flow control (none)
RS-232 settings for baud rate, parity, and data bits are accessible only from the front panel
while RS-232 is enabled.
An interface is selected and configured from the COMMUNICATIONS option of the
Main Menu. See
interfaces, see
page 13-17.
NOTE

GPIB operation

This section contains information about GPIB standards, bus connections, and primary
address selection.

GPIB standards

The GPIB is the IEEE-488 instrumentation data bus with hardware and programming
standards originally adopted by the IEEE (Institute of Electrical and Electronic Engineers)
in 1975. The Model 2500 conforms to these standards:
• IEEE-488.1-1987
• IEEE-488.2-1992
The above standards define a syntax for sending data to and from instruments, how an
instrument interprets this data, what registers should exist to record the state of the instru-
ment, and a group of common commands. The Model 2500 also conforms to this standard:
• SCPI 1996.0 (Standard Commands for Programmable Instruments)
This standard defines a command language protocol. It goes one step farther than
IEEE-488.2-1992 and defines a standard set of commands to control every programmable
aspect of an instrument.
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Section 1, "Main menu."
"Primary address," page 13-6
When changing interface selections, the Model 2500 performs a power-on reset.
To check and/or change options of the selected interface, you must re-enter the
menu structure.
Remote Operations
For details on the programmable aspects of the
and "RS-232 interface operation,"
13-3