2: General operation Series 2600B System SourceMeter® Instrument
2-108 2600BS-901-01 Rev. B / May 2013
GPIB status indicators
The remote (REM), talk (TALK), listen (LSTN), and service request (SRQ) indicators show the GPIB
bus status. Each of these indicators is described below.
REM
This indicator is illuminated when the instrument is in the remote control state. When the instrument is
in the remote control state, all front-panel keys, except for the EXIT (LOCAL) key, and OUTPUT
ON/OFF control, are locked out. When REM is off, the instrument is in the local control state and
front-panel operation is restored.
TALK
This indicator is on when the instrument is in the talker active state. Place the instrument in the talk
state by addressing it to talk with the correct talk command. TALK is off when the instrument is in the
talker idle state. Place the instrument in the talker idle state by sending a UNT (untalk) command,
addressing it to listen, or by sending the IFC (interface clear) command.
LSTN
This indicator is on when the Series 2600B is in the listener active state, which is activated by
addressing the instrument to listen with the correct listen command. LSTN is off when the instrument
is in the listener idle state. Place the instrument in the listener idle state by sending UNL (unlisten),
addressing it to talk, or by sending the 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 are cleared.
LOCAL key
The EXIT (LOCAL) key cancels the remote state and restores local operation of the instrument.
Pressing the EXIT (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 EXIT (LOCAL) key is also inoperative. Note that
pressing the EXIT (LOCAL) key will also abort any commands or scripts that are being processed.
RS-232 interface operation
This topic contains information about configuring RS-232 communication parameters, sending or
receiving command messages, and requesting or retrieving data. To control the Series 2600B,
connect a controller or personal computer to the Series 2600B RS-232 interface. Alternatively, you
can use the Series 2600B to control another device over RS-232.
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