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VEE8.0 conctorl E5071C, used Multiple Windows(as 4 Windows), appear TIMEOUT

Question asked by kevin_liang on May 15, 2012
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?  

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