HP Car 3490A r, 'to7, 191-ul, sampling, with the, followed, Model3490A, SectionIII, programming, programming, F2R4S1T2MlE, Table3-6.AddressCodes

Model3490A											SectionIII
		Table3-6. AddressCodes.
ASCIICODECHARACTER				BINARYCODE						OCTAL CODE
Listen	Talk	Jumper	-+	A5	A4	A3		A2	A1	Listen	Talk
Address	Address	b7	b5	b5	b4	b3		b2	b1
SP	(g'			0	0	0		0	0	040	100
:,	A	See		0	0	0	0	'	l	M 1	1 0 1
	I	note		0	0	0		1	0	o42	102
#		below		0	0	0		1	1	043	103
$	D			0	0	1		0	0	o44	104
7o	E			0	0	1		0	1	045	105
1	F			0	0	1		1	0	046	106
	G			0	0	1		1	1	u7	'to7
(
	H			0	1	0		0	0	0 5 0	1 1 0
l	I			0	1	0	0	'	l	o51	111
	J			0	1	0		1	0	o52	't12
	K			0	1	0		1	1	o53	113
	L			0	1	1		0	0	054	114
	M			0	1	1		0	1	0 5 5	1 1 5
	N			0	1	1		1	0	0 5 6	1 1 6
I	o			0	1	1		1	1	057	117
0	P			1	0	0		0	0	060	120
1	o			1	0	0	0	'	l	061	121
2	R			1	0	0		1	0	6 2	1 2 2
3	S			1	0	0		1	1	063	123
4	T			1	0	t		0	0	064	124
5	U			1	0	1		0	1	065	125
6				1	0	1		1	0	066	126
7	W			1	0	1		1	1	067	'127
8	X			1	1	0		0	0	o70	130
I	z			1	1	0		0	1	o71	131
				1	1	0		1	0	o72	132
;	t			1	1	0		1	1	073	133
				1	1	1		0	0	o74	134
	I			1	1	1		1	1	o75	135
				1	1	1		1	0	076	136

Note: Only first five bits of binary code are given, and these bits are the same for both listen and talk addresses.Sixth and seventh bits determine whether addressis listen (011 or talk (1O).

ever, it cannot be returned to local during output of a reading. If REN goes HIGH then LOW againwhile a r'' reading output is in progress,the 3490A will stay in remote.In order to return to local, then, REN must be HIGH when no readingoutput is in progressThe. 3490A may also be returned to local by turning its power off and back on again.If the 3490A is returnedto local by settingREN HIGH, but is not unaddressedto talk, it will continue to output readings.If thereis a listenersuchas

a9800 seriescalculatoron the bus that is addressedto listen but is not ableto receivedata,the 3490Awill stop sampling, since it cannot output data. This condition may appear to be a failure, since the 3490A would typically be expected to continue sampling and no longerbe under programcontrol.

3-108.RemoteProgramSequenceThe. orderofremote programmingis not important except that it must end

with the E command to execute the program. The 191-ulprogrammingsequenceis one alpha identifier followed by one digrt. For example, the progam F2R4S1T2MlE selectsAC volts, l0V range,Sample/

Hold off, Next External Trigger, AddressedMulti with 'j Output (seeTable 3-7).lf it is necessaryto changeonly

might be R3E. In other words,programdatawill remain stored as long as the instrument is in remote control, unlesschangedby a subsequentprogrammingdata. if more than one alpha identifier or digit is sent, the last valid identifier or digit will be stored. For example, FRl5T20SMF3E will be acceptedas R5T@F3E.Para- graph3-l3l givesa programmingexampleusingthe -hp- 9820A Calculator as the controller and printer. The powerline switchcannotbe programmed.

$109. Trigger Source Program.The following paragraphs explain the trigger sourcecodes shown in Table 3_7.

3-110. T0, Internal SampleRate. The 3490A releases the Hold line when ready for a new measurementto be taken, and the instrument is triggeredaccordingto the internal sample rate. If the front panel Sample Rate control is set to the Hold position, it will not sample

3-9