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.
4
Chapter 4 Remote Interface Reference
Using Device Clear to Halt Measurements
187
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