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S:\HP8924C\USRGUIDE\BOOK\chapters\opoverv.fb
Chapter 3, Operating Overview
Triggering CDMA Measurements In Remote Mode (HP-IB Operation)
2. Trigger all active CDMA measurements
HP-IB Syntax
"TRIG" !triggers all active CDMA measurements.
HP-IB Example Program
10 OUTPUT 714;"DISP CRXT"
20 OUTPUT 714;"TRIG:MODE:RETR SING"
30 OUTPUT 714;"TRIG"
40 END
HP-IB Example Program Comments By Line
10 !Selects CMDA CELLULAR MOBILE RECEIVER TEST screen
20 !Sets the Test Set’s remote trigger mode to Single retriggering
30 !Triggers all active CDMA measurements
Preventing HP-IB Bus Lockup
HP-IB bus lockup is a condition where the HP-IB bus and the Active Controller
handshake are in a temporary holdoff state while the Active Controller waits to read the
measurement result from the Test Set. If a measurement cycle does not successfully obtain
a valid measurement result, it will continue to try until it does or until the measurement
trigger is aborted. This is true for both retriggering modes. This has the consequence of
putting the HP-IB in the lockup state.
The control program should include measurement time-out routines that CLEAR the bus
and ABORt the trigger if a measurement does not complete within a specified amount of
time. This provides a method of preventing the bus from remaining in the temporary
holdoff state indefinitely.
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