Agilent Technologies 8935 Series Bedienungsanleitung PDF herunterladen (Seite 97)

Chapter 4 97

IEEE Common Commands

Common Command Descriptions

Example 4-7 Example BASIC program

10 INTEGER Output_que_val

20 OUTPUT 714;"*SRE 0"! Disable Service Requests

30 OUTPUT 714;"DISP RFG;RFG:OUTP ’Dupl’;AMPL 0 dBm;FREQ 320 MHz;*OPC?"

40 ENTER 714;Output_que_val

50 !Program will wait here until all operations complete

60 PRINT "All operations complete."

70 END

Using the *OPC? query using the MAV bit in the Status Byte

Bit 4 in the Service Request Enable Register is set to a value of 1

(enabled). The *OPC? query is sent to the Test Set at the end of a

command message data stream. The Test Set will request service when

the MAV bit in the Status Byte register is set to the TRUE, logic 1,

state. After the service request is detected the application program can

take appropriate action. Refer to the “HP-IB Service Requests” on page

167 for further information.

Example 4-8 Example BASIC program

10 OUTPUT 714;"*SRE 16"

20 !Enable SRQ on data available in Output Queue (MAV bit)

30 ON INTR 7,15 CALL Srvice_interupt ! Set up interrupt

40 ENABLE INTR 7;2 ! Enable SRQ interrupts

50 OUTPUT 714;"DISP RFG;RFG:OUTP ’Dupl’;AMPL 0 dBm;FREQ 320 MHz;*OPC?"

60 LOOP ! Dummy loop to do nothing

70 DISP "I am in a dummy loop."

80 END LOOP

90 END

100 SUB Srvice_interupt

110 ENTER 714;Output_que_val!Read the 1 returned by the *OPC?

120 ! query command

130 PRINT "All operations complete."

140 ! Note:

150 ! This interrupt service routine is not complete.

160 ! Refer to the “HP-IB Service Requests” on page 167 for

170 ! complete information.

180 SUBEND

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Agilent Technologies 8935 Series Bedienungsanleitung Seite 97