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R-29
A Standard System Protocol
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
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Str
ucture of
the Protocol
This sequence writes the specified number of elements from the address of the specified variable type
using a broadcast.
Send Data Word Allocation (3rd Operand of PMCR(260))
Set the number of bytes to write to twice the number of send data in memory. This is necessary
because the data is converted to ASCII data before being written. When hexadecimal data is con-
verted to ASCII data, data in the first write a0 and +1 is stored in I/O memory in order from
the leftmost word to the rightmost word and the data is sent starting from the send data word with
the largest offset. This is done because user programs handle data in 2-word (4-byte) units.
Receive Data Word Allocation (4th Operand of PMCR(260))
None. (Specify a dummy value for the operand, such as #0000.)
Variable Area Broadcast Send
(Sequence No. 612 (Hex 0264))
Offset Contents (data format) Data
+0 Number of send data words 0007 to 00FA hex (7 to 250 decimal)
+1 (Undefined) ---
+2 Variable type
(2 digits hex)
Set the area type (2 digits) and the first write address (6
digits). The leftmost byte of the first write address speci-
fies the address and the rightmost byte specifies the bit
location. Set the rightmost byte to 00 when bit access is
not required.
+3 First write address (6 digits BCD)
+4 Number of elements (4 digits BCD) Set the number of elements to write.
+5 Number of bytes to write (4 digits hex) Set the number of bytes to write to send.
Note: The data is converted to ASCII in the communica-
tions line, so the number of data bytes is doubled from
S+6 and onwards.
+6
on
Write data Set the data to write from the first write address.
Number of bytes to write
First word of
send data
(Undefined)
+1
+2
+3
First write address
Variable type
+4
Number of elements
+5
Number of send data words
+0
Write data
+6
on
0 0 0 3
0 0 0 2
0 0 0 1
0 0 0 0
4
3
2
1
0 0 0 0 0 0 0 1 0 0 0 3
1 2 3 4
0 0 0 2
Send data words
Send frame