User`s manual

258
By specifying a user frame, in which only NAK (15H) is registered, as the first frame and also specifying
exclusive format-1 received data count for arbitrary data as 2 bytes, a read request will be performed to
the programmable controller CPU upon the reception of NAK + 2-byte data.
*1 The data length for arbitrary data can be specified as a word/byte count of 0 or greater (the unit depends on word/byte
units designation) for each combination of the first frame and the last frame specifying format-1.
The received data count for data reception using format-1 is referred to as exclusive format-1 received data count.
15H 34H 12H
(1234H)
N
A
K
Reception
data
Ignored
: Reception start timing
: Receive complete timing (read timing)
Stored in the reception area
First frame: NAK
Equaling exclusive format-1
receive data count