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Model 7002-HD User's Manual
Front panel IEEE-488 operation
The following paragraphs discuss aspects of the front panel that are part of
IEEE-488 operation, including messages, status indicators, and the LOCAL key.
Error and status messages
Table B-1 on page B-2
with Model 7002-HD operation. Note that the instrument may be programmed to
generate an SRQ, and command queries can be performed to check for specific
error conditions (see Section 5 of the Model 7002-HD Reference Manual).
IEEE-488 status indicators
The REM (remote), TALK (talk), LSTN (listen), and SRQ (service request) annun-
ciators show the present IEEE-488 status of the instrument. Each of these indica-
tors is briefly described below.
REM ⎯ As the name implies, this indicator shows when the instrument is in the
remote state. Note that REM does not necessarily indicate the state of the REM
line, as the instrument must be addressed to listen with REM true before the REM
indicator turns on. When the instrument is in remote, all front panel keys except for
the LOCAL key are locked out. When REM is turned off, the instrument is in the
local state, and front panel operation is restored.
TALK ⎯ This indicator is on when the instrument is in the talker active state. The
unit is placed in this state by addressing it to talk with the correct MTA (My Talk
Address) command. TALK is off when the unit is in the talker idle state. The instru-
ment is placed in the talker idle state by sending it an UNT (Untalk) command,
addressing it to listen, or with the IFC (Interface Clear) command.
LSTN ⎯ This indicator is on when the Model 7002-HD is in the listener active
state, which is activated by addressing the instrument to listen with the correct
MLA (My Listen Address) command. Listen is off when the unit is in the listener
idle state. The unit can be placed in the listener idle state by sending UNL (Unlis-
ten), addressing it to talk, or by sending IFC (Interface Clear) over the bus.
SRQ ⎯ The instrument can be programmed to generate a service request (SRQ)
when one or more errors or conditions occur. When this indicator is on, a service
request has been generated. This indicator will stay on until the serial poll byte is
read.
summarizes the error and status messages associated
Return to
Section 5 topics
IEEE-488 Operation
5-5
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