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284 Chapter 8

O:\Manuals\E6380A_Progguid\Book\Ibasic.fm

IBASIC Controller

PROGram Subsystem

Example 8-42 Example of querying the value of a string array whose name is

known but whose current size is unknown

05 OPTION BASE 1

10 DIM Temp$[5000] !This will hold 5000 characters

20 DIM Temp_array$(50)[200]!Temp array: 50 elements of 200 character

30 OUTPUT 714;"PROG:STR? Array" !Query the desired array

40 ENTER 714;Temp$ !Enter the values into a temporary string variable

50 N=0 !Initialize array pointer

60 EPEAT !Start loop to take values from string and put in array

70 N=N+1 !Increment array pointer

80 Pos_comma=POS(Temp$,",") !Find comma separator

90 Temp_array$(N)=Temp$[2,Pos_comma-2] !Put value into array

100 Temp$=Temp$[Pos_comma+1] !Remove value from temporary string

110 UNTIL POS(Temp$,",")=0 !Check for last value in temporary string

120 Temp_array$(N+1)=Temp$[2,LEN(Temp$)-1]!Put last value in array

130 END

The above example assumes that the total number of characters in the

dimensioned size of the IBASIC string array named Array is smaller

than the dimensioned size of the string variable named Temp$. Also,

the maximum length of any element in the IBASIC string array Array

must be less than or equal to 200 characters.

:WAIT The :WAIT command stops the Test Set from executing any

commands or queries received through HP-IB until after the IBASIC

program exits the RUN state; that is, the program is either PAUSED or

STOPPED.

CAUTION

The Test Set will continue to process HP-IB commands into the HP-IB

input buffer up to the point that the buffer is full. If the external

controller attempts to send more commands than can fit into the HP-IB

input buffer before the IBASIC program is PAUSED or STOPPED, the

HP-IB bus will appear to be locked up. This is due to the fact that the

HP-IB bus and the external controller will be in a temporary holdoff

state while waiting for the HP-IB input buffer to empty.

If a query command is sent to the Test Set while the IBASIC program is

under the influence of a :WAIT command, no data will be put into the

Test Set’s Output Queue until the IBASIC program is either PAUSED

or STOPPED. If the external controller attempts to enter the queried

data before the IBASIC program is PAUSED or STOPPED, the HP-IB

bus will appear to be locked up. This is due to the fact that the HP-IB

bus and the external controller will be in a temporary holdoff state

while waiting for the data to be put into the Output queue to satisfy the

enter command.

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