150 Chapter 11
Using HP Instrument BASIC
Pass Control Involved with an External Controller
Communicating with an external controller
Example 11-1 shows an example of communication between an external controller and the
4294A Instrument BASIC. This example shows a program executable only on the external
controller. It is given a file name prg_xfer.bas and is stored in the sample program disk.
This program transfers a program file saved in the external controller's storage unit (hard
disk or the like) and executes the file.
Line 20 This line resets GPIB bus and returns the control priority to the system
controller.
Line 30 This line sets the GPIB address.
Line 40 This line receives a user-entered file name of a program to transfer.
Lines 50 to 60 These lines delete existing programs held in Instrument BASIC, then
transfer the header (the header that indicates that the size data portion
hasn't been defined).
Lines 90 to 130 These lines read program lines, one by one, and transfer them.
Line 160 This line sends the signal of end of transmission (<LF>+EOI).
Line 190 This line executes the program transferred.
Example 11-1 Transferring a program to Instrument BASIC
10 DIM File_name$[20],Line$[1024]
20 ABORT 7
30 ASSIGN @Hp4294a TO 717
40 INPUT "FILENAME?",File_name$
50 OUTPUT @Hp4294a;"PROG:DEL:ALL"
60 OUTPUT @Hp4294a;"PROG:DEF #0"
70 ASSIGN @File TO File_name$
80 ON ERROR GOTO Done
90 LOOP
100 Line$=""
110 ENTER @File USING "K";Line$
120 OUTPUT @Hp4294a;Line$
130 END LOOP
140 Done: !
150 OFF ERROR
160 OUTPUT @Hp4294a;" ",END
170 ASSIGN @File TO *
180 !
190 OUTPUT @Hp4294a;"PROG:EXEC ""RUN"""
200 END
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