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5820A
Operators Manual
5-26
IEEE-488.2
IEEE-488.2 is the software portion of the interface, specifying data formats,
common commands, message exchange protocol and the status register implementation.
Use the following to decode the columns in table 5-4. Appendix D shows a typical IEEE-
488 connector and pin assignments.
Type M - Multiline
U
-
Uniline
Class AC - Addressed Command
DD - Device Dependent
AD - Address (Talk or listen)
HS - Handshake
UC - Universal Command
SE - Secondary
ST - Status
Other B1, B2, etc. - Information Bits
Logic Zero = 0 = False
Blanks - Doesn’t Care condition
Logic One = 1 = True
5-23.
Using Commands
Communications between the controller and the 5820A Calibrator consists of commands,
queries, and interface messages. Although the commands are based on the 488.2
standard, they can be used on either the IEEE-488 or RS-232 interface, except for a few
specialized RS-232 commands described in “Commands for RS-232 Only.” (For more
information on command structures, see the IEEE 488.2 standard.)
Refer to Chapter 6, when you require additional information about command references
used in this chapter.
All commands and units may be entered in UPPER or lower case.
IEEE-488 Mode
The IEEE-488 mode is used when the 5820A Calibrator is operated by
computer program. In this mode, requested information is returned by query, and
interface messages are queued and returned by command.
RS-232 Terminal Mode
The RS-232 terminal mode is an interactive mode where an
operator inputs commands, with immediate returns for requested information (queries)
and interface messages.
RS-232 Computer Mode
The RS-232 computer mode is used when the 5820A
Calibrator is operated by computer program. In this mode, requested information is
returned by query, and interface messages are queued and returned by command.
RS-232 Pass-Through Mode
The RS-232 pass-through mode is used to pass commands
from the PC to a UUT, but via the 5820A Calibrator. This configuration is used when the
UUT has an RS-232 port. Commands are sent to the UUT by using the
UUT_SEND
command, returns use the
UUT_RECV?
query, and
UUT_FLUSH
clears the UUT receive
buffer in the 5820A Calibrator.
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