Agilent Technologies E1300B, E1301B, 75000 SERIES B user manual END While

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 09

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