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(4) Available designation range of first address and number of bytes
A command to specify the first address and the number of bytes in a command and the available designation range are shown in the
table below. If you specify any value out of the available range, a command error occurs.
Command code
Available designation range of first address and number of bytes
Read (RD)
A) Available designation range of first address: 0000h to 007Fh
B) Available designation range of number of bytes: 01h to 80h
Write (WT)
A) Available designation range of first address: 0000h to 007Fh
B) Available designation range of number of bytes: 01h to 80h
Computation Write
A) Available designation range of first address: 0000h to 007Fh
(CW)
B) Available designation range of computation area: 01h to 80h
Data Fill (DF)
A) Available designation range of first address: 0000h to 007Fh
B) Available designation range of end address: 0000h to 007Fh
Memory Check (MD)
A) Available designation range of first address: 0000h to 007Dh
B) Available designation range of number of check bytes: 03h to 80h
* If the first address is 20h and the number of bytes is 70h, a command error occurs due to "A + B = 90h".
(5) Example of calculation of FCS
Exclusive-OR is executed from the node number to the end of data at every 1 byte. The result is converted into an ASCII code and
added.
Reading 16 bytes from the address 0000h
Node No.
Command code
Calculation range of FCS
Calculation result
Data
9
7
5-2 Command Response Format
Terminator
Other restriction
A + B ≤ 80h*
A + B ≤ 80h*
A + B ≤ 80h*
A ≤ B
A + B ≤ 80h*
5-5
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