11-8 Return to Section Topics 2600S-901-01 Rev. C / January 2008
Section 11: Communications Interfaces Series 2600 System SourceMeter® Instruments Reference Manual
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 listen 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.
LOCAL key
The LOCAL (EXIT) 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. For safety
reasons, the OUTPUT OFF key can be used to turn the output off while in LLO. Note that pressing
LOCAL or OUTPUT OFF will also abort any commands or scripts that are being processed.
RS-232 interface operation
Setting RS-232 interface parameters
Front panel RS-232 parameters
To set interface parameters:
1. Press MENU > RS-232 and then press ENTER or push in on the the Rotary Knob.
2. Complete the followng interface parameters:
• Baud rate
• Number of bits
•Parity
• Flow control
(See the following section for details)
3. Press EXIT as needed to back out of the menu structure.
Remote RS-232 parameters
Commands to set RS-232 parameters are listed in Table 11-2. See Section 12 for more
information.
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