HP 34970A manual Gz z READ? xvy z z, Xv zy zyv w z FETCh? xv3 zxz z Vy vz zy vy z

Chapter 5 Remote Interface Reference

Simplified Programming Overview

	l		READ? S
	The READ? command changes the state of the scan trigger system from
	the “idle” state to the “wait-for-trigger” state. Scanning will begin when
	the specified trigger conditions are satisfied following the receipt of the
	READ? command. Readings are then sent zyz				to the instrument’s
	output buffer. You			then enter the readings into your computer or
	the instrument will stop scanning when the output buffer becomes full.
	Readings vz		stored in the instrument’s internal memory when
	using the READ? command.
	F gz” z		READ? xvy z ” z		INITiate
	xv “zy zyv w z			FETCh? xv3 zxz z
	vy” vz zy vy” z ”				READ?5
	V“ z xvy	zvy” z “ z
Caution
	“y z v vy	x 3 zxzz
	yvv “ z “ zz “zy w z xzz x 5
	hy 3 y v z “ zvy” z
	5 l xvy zy v Qzz Pzv
	wz“ ” z zxy zv5
	l		INITiate y	FETCh? S

The INITiate and FETCh? commands provide the lowest level of control (with the most flexibility) of scan triggering and reading retrieval. Use the INITiate command after you have configured the instrument for a scan. Scanning will begin when the specified trigger conditions are satisfied following the receipt of the INITiate command. The readings are placed in the instrument’s internal reading memory (up to 50,000 readings can be stored; if memory fills, new readings will overwrite the

first readings stored). Readings vz zy in memory until you are able to retrieve them.

Use the FETCh? command to transfer all of the readings from reading memory to the instrument’s output buffer where you can read them into

your computer. Note that the FETCh? command yz clear memory. You can send the FETCh? command any number of times to retrieve the same data in reading memory.

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