7-11
Chapter 7. CPL Communication Function
Fixed-length random data read command (RU command)
This command reads random (non-consecutive) data in two-byte units.
z
Instruction message
The word address (four hexadecimal digits) of the data to be read is sent in the
specified order.
R U 0 0
(1) (2) (3) (4) (5)
(1) Fixed-length random data read command
(2) Sub-command: fixed to “00”
(3) Word address 1
(4) Word address 2 to (n−1)
(5) Word address n
z
Response message
If the command is processed successfully, a termination code indicating success
(two decimal digits) is returned with the specified number of read data records
(four hexadecimal digits × read data count). If there was an error, a termination
code indicating error (two decimal digits) is returned without appending the data
that was read.
• Normal termination
0 0
(1) (2) (3) (4)
• Abnormal termination
X X
A termination code indicating an error is entered in place of XX.
7 - 6 List of Termination Codes (p.7-15) (for details about termination
codes)
(1)
(1) Termination code
(2) Read data 1
(3) Read data 2 to (n−1)
(4) Read data n
z
Maximum read data count per message
64 words
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