I use VEE8.0 now, write a program for E5071C (four-port, 20G), I need to open four Windows(channnel), each window under one TRANCE, read out the TRANCE data of the four Windows to a PC, command:

:TRIG:SOUR BUS

:TRIG:SING

*OPC?

:CALC1:DATA:FDAT

...

:TRIG:SOUR BUS

:TRIG:SING

*OPC?

:CALC2:DATA:FDAT

...

:TRIG:SOUR BUS

:TRIG:SING

*OPC?

:CALC3:DATA:FDAT

...

:TRIG:SOUR BUS

:TRIG:SING

*OPC?

:CALC4:DATA:FDAT

But at the time of the fourth cycle (ie: CALC4:DATA:FDAT), program error, TIMEOUT? This is what causes?

:TRIG:SOUR BUS

:TRIG:SING

*OPC?

:CALC1:DATA:FDAT

...

:TRIG:SOUR BUS

:TRIG:SING

*OPC?

:CALC2:DATA:FDAT

...

:TRIG:SOUR BUS

:TRIG:SING

*OPC?

:CALC3:DATA:FDAT

...

:TRIG:SOUR BUS

:TRIG:SING

*OPC?

:CALC4:DATA:FDAT

But at the time of the fourth cycle (ie: CALC4:DATA:FDAT), program error, TIMEOUT? This is what causes?