Models 2500 and 2502 User’s Manual Remote Operations 13-3
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 Section 1, “Main menu.” For details on the programmable aspects of the
interfaces, see “Primary address,” page 13-6 and “RS-232 interface operation,”
page 13-17.
NOTE 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.
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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