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10-24 Remote Operations
Model 6220/6221 Reference Manual
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Front panel GPIB operation
The following paragraphs describe aspects of the front panel that are part of GPIB
operation, including messages, status indicators, and the LOCAL key.
Error and status messages
See Appendix B for a list of error and status messages associated with IEEE-488
programming. The instrument can be programmed to generate an SRQ and com-
mand queries can be performed to check for specific error conditions.
GPIB status indicators
The REM (remote), TALK (talk), LSTN (listen), and SRQ (service request) annun-
ciators show the GPIB bus status. Each of these indicators is described below.
•
REM
— This indicator shows when the instrument is in the remote state.
REM does not necessarily indicate the state of the REM line, as the instru-
ment 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 and OUTPUT OFF, 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. Place the unit in the talk 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. Place the unit in the talker idle state by sending a UNT (Untalk)
command, addressing it to listen, or sending the IFC (Interface Clear) com-
mand.
•
LSTN
— This indicator is on when the Model 622x is in the listener active
state, which is activated by addressing the instrument to listen with the cor-
rect MLA (My Listen Address) command. LSTN is off when the unit is in the
listener idle state. Place the unit in the listener idle state by sending UNL
(Unlisten), addressing it to talk, or sending the IFC (Interface Clear) com-
mand over the bus.
•
SRQ
— You can program the instrument 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 stays on until the
serial poll byte is read or all the conditions that caused SRQ have ceased to
exist.
LOCAL key
The LOCAL key cancels the remote state and restores local operation of the
instrument. Pressing the LOCAL key also turns off the REM indicator and returns
the display to normal if a user-defined message was displayed. If the LLO (Local
Lockout) command is in effect, the LOCAL key is also inoperative.
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