Agilent-technologies E1300B Manual do Utilizador descarregar pdf (Página 127)

Example: Synchronizing an External Computer and Two Instruments

using the *OPC command.

This example uses the *OPC command and serial poll to synchronize an

external computer and two instruments (DAC at secondary address 09;

Scanning Voltmeter at secondary address 03). The advantage to using this

method over *OPC? query method is that the computer can do other operations

while it is waiting for the instrument(s) to complete operations. When using this

method, the Operation Complete bit (bit 0) must be the only enabled bit in the

Standard Event Status Register (*ESE 1 command). If other bits (such as error

bits) are enabled, you must make sure that bit 0 causes the interrupt.

10 OUTPUT 70909;"*CLS"

!Clear all status structures on instrument at secondary address

20 OUTPUT 70909;"*ESE 1"

!Enable Operation Complete to be reflected in bit 5 of the

Status Byte Register

30 OUTPUT 70909;"SOUR:VOLT1 5;*OPC"

!Configure instrument # 1, set Operation Complete bit when

done

40 WHILE NOT BIT(SPOLL(70909),5)

!While waiting for bit 5 in instrument’s Status Byte Register to

be set,

!computer can do other operations

50 !(Computer does other operations here)

60 END WHILE

70 OUTPUT 70903;"MEAS:VOLT:DC? (@104)"

!Measure DC voltage using instrument # 2

80 END

Controlling Instruments Using GPIB 6-13

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Agilent-technologies E1300B Manual do Utilizador Página 127