Remote Operations 13-9
Front panel GPIB operation
This section describes 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 status and error messages associated with IEEE-488 program-
ming. The instrument can be programmed to generate an SRQ, and command queries can be
performed to check for specific error conditions.
GPIB status indicators
The REM (remote), TALK (talk), LSTN (listen), and SRQ (service request) annunciators
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 bus REN line, as the instrument must be addressed to listen with REN
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.
NOTE If LLO is in effect, LOCAL will be locked out. OUTPUT ON/OFF is still operational
in remote. If ARM:SOUR is set to manual, the TRIG key will be active in remote.
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 an UNT
(Untalk) command, addressing it to listen, or sending the IFC (Interface Clear) command.
LSTN
This indicator is on when the SourceMeter is in the listener active state, which is activated
by addressing the instrument to listen with the correct 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 IFC (Interface Clear) command 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
been cleared. See Section 14 for more information.
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