Yokogawa PR300 Power and Energy Meter - Manual (Page 72)

<Toc> <Ind> <4. PC Link Communication Protocol>
4-11
IM 77C01E01-10E
WRS Specifies the D registers to be monitored on a word-by-word basis
●
Function
This function code specifies the register numbers to be monitored on a word-by-word
basis. Note that this command simply specifies the registers. Actual monitoring is per-
formed by the WRM command after the register numbers are specified by this command.
If the volume of data is large and you wish to increase the communication rate, it is effective
to use a combination of the WRS and WRM commands rather than the WRR command. If
the power supply is turned off, the register numbers specified will be erased.
• The number of words to be specified at a time is 1 to 32.
• For the format of response in the event of failure, see subsection 4.1.2.
• The command shown below includes the checksum function. When performing
communication without the checksum, do not include the 2-byte checksum element in
the command.
●
Command/Response (for normal operation)
Number
of Bytes
Command
element
1
STX
2
Station
number
(ST-NO)
2
Number
of words
(n)
5
Register
number
1
5
Register
number
2
1
Comma
or space
1
Comma
or space
5
Register
number
n
2
01
3
WRS
1
0
Number
of Bytes
Response
element
1
STX
2
Station
number
(ST-NO)
2
01
2
OK
…
…
2
Checksum
2
Checksum
1
ETX
1
CR
1
ETX
1
CR
Command (continued)
●
Example
Specify that the active power (register symbol: W L and W H) of the PR300 at station
number 01 is to be monitored. (This command simply specifies the registers.)
The register numbers for active power are D0021 and D0022.
[Command]
[STX]01010WRS02D0021,D00228B[ETX][CR]
“OK” will be returned in response to the command above.
[Response]
[STX]0101OK5C[ETX][CR]