HP 34970A User Manual download pdf (Page 226)

100

101

Scanning Commands

ROUTe

:SCAN (

@<scan_list>)

:SCAN?

Select the channels to be included in the scan list. To start the scan,

use the INITiate or READ? command. To remove all channels from the

scan list, send ROUT:SCAN (

@).

The :SCAN? query returns a list of channel numbers in the

SCPI

definite length block format. The response begins with the “#” character,

followed by a single character representing the number of succeeding

characters to interpret as a length specifier, followed by a length

specifier representing the number of bytes in the block, followed by a

block of that many bytes. An empty scan list (one with no channels

selected) will be “#13(

@)”.

For example, if you send ROUT:SCAN (

@101:103), the ROUT:SCAN?

command will return the following:

#214(@101,102,103)

ROUTe:SCAN:SIZE?

Query the number of channels in the scan list. Returns a value between

0 and 120 channels.

TRIGger

:SOURce {BUS|IMMediate|EXTernal|ALARm{1|2|3|4}|TIMer}

:SOURce?

Select the trigger source to control the onset of each sweep through the

scan list (a sweep is one pass through the scan list). The selected source

is used for all channels in the scan list. The instrument will accept a

software (bus) command, an immediate (continuous) scan trigger, an

external

TTL trigger pulse, an alarm-initiated action, or an internally-

paced timer. The default is “

IMMediate”. The :SOUR? query returns the

present scan trigger source. Returns “

BUS”, “IMM”, “EXT”, “ALAR1”,

“

ALAR2”, “ALAR3”, “ALAR4”, or “TIM”.

Chapter 5 Remote Interface Reference

Scanning Overview

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HP 34970A User Manual Page 226

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