Specifications

Using Device Clear to Halt Measurements

Device clear is an IEEE-488 low-level bus message which can be used to

halt measurements in progress. Different programming languages and

IEEE-488 interface cards provide access to this capability through their

own unique commands. The status registers, the error queue, and all

configuration states are left unchanged when a device clear message is

received. Device clear performs the following actions.

• All measurements in progress are aborted.

• The meter returns to the trigger “idle state”.

• The meter’s input and output buffers are cleared.

• The meter is prepared to accept a new command string.

• For

RS-232 operation, sending the control-C character will perform

the equivalent operations of the

IEEE-488 device clear message.

The meter’s

DTR (data terminal ready) handshake line will be true

following a device clear message. See “DTR / DSR Handshake

Protocol,” on page 179 for further details.

TALK ONLY for Printers

You can set the meter’s HP-IB address to “31” which is the talk only mode.

In this mode, the meter can output readings directly to a printer without

being addressed by a bus controller. Address 31 is not a valid address if

you are operating the meter from the

HP-IB interface with a bus

controller.

If you select the

RS-232 interface and then set the HP-IB address to the

talk only address (31), the meter will send readings over the

RS-232

interface when in the local mode.

Chapter 4 Remote Interface Reference

Using Device Clear to Halt Measurements

187

GPIB