2308-900-01 Rev. A / July 2008
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Section Topics
9-9
Model 2308 Portable Device Battery/Charger Simulator User’s Manual
Section 9: Measurement Commands and Optimizing Measurement Speed
released when all the commands have finished executing, or if there is some parser or command
error.
Trigger-on-talk
Trigger-on-talk functionality has been added for the 488.1 protocol. If a query has not been
received by the instrument, the power supply will automatically assume a read query command
has been sent when it is addressed to talk. This technique increases GPIB speed by decreasing
the transmission and parser times for the command. Trigger on talk applies to the active channel
(
DISP:CHAN?
). If the active channel is the battery channel (#1), then it assumes a
READ1?
; if
channel 2 is active, then
READ2?
.
Message available
The MAV (message available) bit in the Serial Poll byte will be set when the query is finished being
processed, not when there is data available in the output buffer (as with the SCPI protocol). For
the 488.1 protocol, output data will not be formatted until the first request for data is received. This
delay may cause unexpected time-outs when using SRQ on MAV for queries that take a long time
to execute.
General operation notes
• The remote blinking R on the front panel still operates since it is critical to fundamental GPIB
operation.
• If the unit is in REMote, the GTL command may not put the power supply into the local
mode. Only the front-panel LOCAL key is guaranteed to operate, if not in local lockout
(LLO). GTL will still disable LLO.
• IEEE-488 bus commands and features (GET, IFC, SDC, DCL, LLO, Serial Poll, and SRQ)
are still fully supported.
• Multiple TALKs on the same query are supported as in the SCPI protocol. This feature is
useful when reading back long ASCII strings.
Trigger on talk both channels
Trigger on talk will return a reading for the active channel
(DISPlay:CHANnel?
) unless you
have enabled (ON) the setting for Trig on talk to return two readings—one from each channel
comma delimited (for example: ch1 reading, ch2 reading). This command maps trigger on talk to
BOTHREAD?
when enabled.
To enable the two readings trig on talk and have it apply to both channels (
READ1?
for channel 1,
READ 2? for channel 2), send:
SYSTem:TRIGger:TALK:BOTH ON
To disable the two readings trig on talk, send:
SYSTem:TRIGger:TALK:BOTH OFF
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