HP 132A User Manual download pdf (Page 107)

Chapter 3 Programming Your Universal Counter for Remote Operation

Elements of SCPI Commands

Programming Guide 3-39

Using the Standard Event Status Register to Trap an Incorrect

HP-IB command—Example 2

The following command grouping shows how to use the Standard Event Status

command is sent to the Counter.

The command *ESE 32 tells the Counter to summarize the command error bit ( bit

5 of the Event Status Register) in the Status Byte Register. The command error bit

is set when an incorrect command is received by the Counter. The command *SRE

32 tells the Counter to assert the SRQ line when the Event Status Register

summary bit is set to 1. If the Counter is serial polled after a command error, the

serial poll result will be 96.

Event Status Register

*ESE 32

*SRE 32

Enable for bad command.

Assert SRQ from Standard Event Status Register summary.

Using the Questionable Data/Signal Status Register to Alert the

Computer When Automatic Interpolator Calibration is

Disabled—Example 3

The default operation of the Counter is for automatic interpolator calibration to

occur before every measurement. To optimize throughput over the HP-IB, the

automatic calibration can be disabled. When it is disabled, the most recent

calibration values are used. These values may not be the optimal values for a

particular temperature or other environmental condition. For this reason,

the Time, Frequency and Phase bits in the Questionable Data register are set

whenever the automatic calibration is disabled.

In the following Questionable Data Status Register example, the first line tells the

Counter to detect a transition from negative

(non-questionable data) to positive (questionable data) of bits 2, 5, and 6 in the

Questionable Data Register. The next line tells the Counter to summarize the

detected events in the Status Byte Register. The command *SRE 8 tells the

Counter to assert the SRQ line when the summary bit for the Questionable Data

calibration transitions from on to off.

1 2 ... 102 103 104 105 106 107 108 109 110 111 112 ... 329 330

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HP 132A User Manual Page 107