How do I Retrieve Data From the Instrument Only When it is Updated Using Pre-IEEE488.2 Commands?
You can determine whether data was updated by performing a serial poll and referencing the status byte.
Bit 0 of the status byte (D101) changes to 1 when data is updated. When bit 0 changes to 1, bit 6 (D107) also changes to 1.
Also, bit 0 and 6 are reset when a serial poll is performed.
You can judge the data update status by referencing bit 0 and bit 6.
However, even if you suddenly read the status byte and determine that bit 0 and bit 6 are set to 1, this does not indicate at what time the update occurred. Therefore, perform a dummy serial poll, and clear the contents of the extended event register. Then perform repeated serial polls, and confirm the changing of the returned value's bit 0 and bit 6 to 1. Then if you send the "OD" command, the data is not read out until updated.
For details on the status byte, see the following:
Bit 0 of the status byte (D101) changes to 1 when data is updated. When bit 0 changes to 1, bit 6 (D107) also changes to 1.
Also, bit 0 and 6 are reset when a serial poll is performed.
You can judge the data update status by referencing bit 0 and bit 6.
However, even if you suddenly read the status byte and determine that bit 0 and bit 6 are set to 1, this does not indicate at what time the update occurred. Therefore, perform a dummy serial poll, and clear the contents of the extended event register. Then perform repeated serial polls, and confirm the changing of the returned value's bit 0 and bit 6 to 1. Then if you send the "OD" command, the data is not read out until updated.
For details on the status byte, see the following:
- WT1010 Digital Power Meter User's Manual
Page App1-13 - WT1030/1030M Digital Power Meter User's Manual
Page App1-15 - WT2010 Digital Power Meter User's Manual
Page App1-17 - WT2030 Digital Power Meter User's Manual
Page App1-17 - WT110E/WT130 Digital Power Meter User's Manual
Page 11-3 - WT200 Digital Power Meter User's Manual
Page 10-4 - WT210/230M Digital Power Meter User's Manual
Page 10-4
Related Products & Solutions
WT2010/WT2030 Digital Power Meters
The WT2000 digital powermeter series has been designed with emphasis on basic performance (bandwidth, accuracy, response speed, and noise immunity) from the viewpoint of measurement of electrical quantities. The broad range of functions of these power analyzers enable them to be used in various fields of applications.
Power Analyzers and Power Meters
Yokogawa, the world's largest manufacturer of energy and power analyzers and meters, provides a broad choice of digital power analyzers to satisfy all requirements.
Top