Measured/computed data and fifo data – Yokogawa Button Operated MV2000 User Manual
Page 146
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M-4662
Measured/Computed Data and FIFO Data
• The MV returns the measured/computed data in response to an FD command.
• The MV returns the FIFO data in response to an FF command.
• You can use the CB command to specify whether or not the MV will return data of
measurement channels set to skip and computation and external input channels set to
OFF.
• The ID number of the output format is 1. See “ID” in section 5.1.
2 bytes
Number of blocks
Block 1
...
Block n
Number of bytes
2 bytes
Binary data
(The binary data section in the
“Conceptual diagram” in section 5.1.)
Number of Blocks
This is the number of blocks.
Number of Bytes
This is the size of a block in bytes.
Block
T**
…
…
T**
…
…
T**
…
…
Year
Month
Channel
…
…
Channel
…
…
Channel
…
…
A2A1
…
…
A2A1
…
…
A2A1
…
…
A4A3
…
…
A4A3
…
…
A4A3
…
…
Min
ms
(Reserved)* Flag
s
Measured data
…
…
External input data
…
…
Computed data
…
…
1 byte
1 byte 1 byte
1 byte
1 byte
1 byte
2 bytes
1 byte
1 byte
4 bits
12 bits
Day
Hour
* The sections indicated as (Reserved) are not used. The value is undefined.
** Abbreviation of “Type” for the purpose of this figure.
• Flag
A description of each flag is given in the table below. The flags are valid for FIFO
data output. The flags are undefined for other cases.
Bit
Flag
Description
0
1
7
No
Yes
Indicates that the screen snapshot was executed.
6
–
–
5
–
–
4
–
–
3
–
–
2
No
Yes
Indicates that the decimal place or unit information was
changed during measurement.
1
No
Yes
Indicates that the FIFO acquiring interval was changed with
the FR command during measurement.
0
No
Yes
Indicates that the internal process took too much time
(computation, for example) and that the measurement could
not keep up at the specified scan interval.
The bits that have “–” for the flag column are not used. The value is undefined.
5.3 Binary Data Output Format