Denso RC5 Interface Manual page 83

3.5.3.9 I/O Write (1001)
(1) Function
This command substitutes the status specified in data area 1 for the 8-bit
internal I/O area starting from the number specified in data area 2.
(2) Format
Command area (4 bits, input)
1001
Data area 1 (8 bits, input)
The status to be set will be specified in the internal I/O area starting from
the number specified in data area 2.
Data area 2 (16 bits, input)
This is first number of the internal I/O (8-bit) area for which the status will
be substituted. The number can be set between 128 and 504. If the
number is out of this range, an error (ERROR2034) will occur.
Status area (16 bits, output)
Nothing will be output.
(3) Description
This command substitutes the status specified in data area 1 for the 8-bit
internal I/O area starting from the number specified in data area 2.
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