User`s guide

3-6

Programming over GPIB

Lockout

With GPIB, the instrument is placed in the lockout mode by sending the local

lockout command (LLO). The instrument can be returned to local by sending

the go-to-local (GTL) command to the instrument.

Bus Commands

The following commands are IEEE 488.1 bus commands (ATN true). IEEE

488.2 defines many of the actions which are taken when these commands are

received by the instrument.

Device Clear

The device clear (DCL) or selected device clear (SDC) commands clear the

input and output buffers, reset the parser, and clear any pending commands. If

you send either of these commands during a digitize operation, the digitize

operation is aborted.

Interface Clear (IFC)

The interface clear (IFC) command halts all bus activity. This includes

unaddressing all listeners and the talker, disabling serial poll on all devices, and

returning control to the system controller.