2400 Series SourceMeter
®
User’s Manual Remote Operations 14-9
NOTE With :ARM:SOURce BUS selected and an :INITiate command sent, do not send
any commands (except GET, DCL, SDC, IFC, *TRG, and :ABORt) while per-
forming source-measure operations (ARM annunciator on). If you do, erratic
operation will occur.
SPE, SPD (serial polling)
Use the serial polling sequence to obtain the SourceMeter serial poll byte. The serial poll
byte contains important information about internal functions. (See Section 15, “Status
Structure.”) Generally, the serial polling sequence is used by the controller to determine
which of several instruments has requested service with the SRQ line. However, the serial
polling sequence may be performed at any time to obtain the status byte from the
SourceMeter.
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 error and status 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 opera-
tional in remote. If ARM:SOUR is set to manual, the TRIG key will be active in
remote.
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