Agilent Technologies 8935 Series Manual do Utilizador descarregar pdf (Página 61)

Chapter 2 61

Methods For Reading Measurement Results

RMB ‘MAV’ Example Program

360 Perform a serial poll to read the Status Byte from the Test Set.

A serial poll is used because the *STB Common Command

cannot be processed by the Test Set while a query is pending.

Sending the *STB command will cause an

’HP-IB Error: -410 Query INTERRUPTED’ error.

370 Check bit 4, the Message Available bit (MAV), to see if it is set

to ’1’. If it is, then the requested measurement result is ready.

380 Read the measurement result.

390 Set the trigger mode to repetitive retriggering. Setting the

trigger mode to repetitive will be implementation dependent.

400 Re-enable event initiated branching. If any event initiated

branches were logged while the Measure function was

executing they will be executed when system priority permits.

410 Exit the Measure function and return the result value.

430 Check to see if the measurement result time out value has

been equaled or exceeded. If it has the polling loop will be

exited.

440 The following lines of code handle the case where the request

for a measurement result has timed out because the polling

loop has completed with no result available.

450 Set up a time-out for any I/O activity on the HP-IB while the

control program is trying to regain control of the Test Set. This

will allow the function to gracefully stop program execution if

the control program cannot regain control of the Test Set. This

time-out should only occur if there is some type of hardware

failure, either in the Test Set or the external controller, which

prevents them from communicating via HP-IB.

460 Send a Selected Device Clear (SDC) to the Test Set to put the

HP-IB subsystem into a known state. This allows the control

program to regain programmatic control of the Test Set.

470 Command the Test Set to abort the currently executing

measurement cycle. Set the trigger mode back to repetitive

retriggering. Setting the Test Set back to repetitive

retriggering will be implementation dependent.

480 Exit the Measure function and return a result value of 9.E+99.

Table 2-2 Comments for Measure Function from MAV

Example Program

Program

Line

Number

Comments

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 328 329

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