HP 5335A - Page 59

T1UUV-I l
Operation and Programming
3-209. PROGRAMMING EXAMPLES
3-210. The following HP-1B programming examples are provided for information and illus¬
tration only. Sample programs are provided for both 9825A and 9835A Computing Controllers,
and assume a 5335A address of decimal “3”.
EXAMPLE 1. A) TYPICAL MEASUREMENT FORMAT
This program first dimensions a string variable in the controller for the incoming data and then
sets the 5335A to its default mode (Initialize) with a gate time of 500 ms (.5 seconds). The counter
will then make a simple Frequency A measurement. In step 2 the controller will read the
measurement into string A, and then step 3 displays the information. After waiting for 1 second
(1000 milliseconds), the program loops back into reading a "new measurement" and the cycle is
repeated.
9825A EXAMPLE
9835A EXAMPLE
0 :
c! i m A T 1 Z 1 \
i 0
DIM ATi:21 :i
1. :
wrt 703> " i n , q a . S "
2 0
OUTPUT 7 0 3 ; "
2 ■
r & d 7 0 3 •. A T
30
(INTER 7 03 > AT
3 ;
dsp AT
4 0 I) ISP A$
4 :
wait 10 0 0
50
WAIT 1000
c; .
/'! f’l — A
6 0
GOTO 30
£> :
*2^
Vj *. U \.J
end
362
7 0
END
EXAMPLE 1. B) TYPICAL MEASUREMENT FORMAT
This is an example of how the controller can be used to display a measurement once every
5 seconds. After a measurement is accepted in step 2, the HP-IB's RFD (Ready For Data) line is held
false until another read instructions is executed. This means that during the wait statement in step
A, the RFD line is false. The 5335A will check the RFD line whenever it is addressed to talk to make
sure that the listening device is ready for data, if it finds RFD false and the wait mode is off, the
counter will skip trying to output the data and start a new measurement.
In this example the 5335A will continue to make measurements without sending data until
5 seconds have passed. After 5 seconds, the next measurement that comes is sent.
Note that this check of the RFD line is done for the first character of a measurement data string
only. Subsequent characters are sent normally.
9825A EXAMPLE 9835A EXAMPLE
0 :
d :i. m A $ [ 21 J
1 0 DIM AT [2:1 1
1. :
wrt 703., "in "
20 OUTPUT 703;"i n "
r e d 7 0 3 , A T
3 0
ENTER 703;AT
3 :
dsp AT
4 0
DISP AT
4 :
wait SO00
SO
WAIT soon
5 :
cf t o - ■ 3
6 0
GOTO 30
6 :
en d
70
END
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