KEYENCE CV-X Series - Manual (Page 18)

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Basic flow when controlling via command input from the I/O terminal.
3. Command input timing
CMD_CODE
CMD_PARAM
CST
CMD_READY
ACK
execution successful
NACK
execution failed
A: 1 msec or more B: Same as the STO output time C: Within 500 μsec D: 500 μsec or more
A
B
C
D
B
C
The command is executed when the CMD_CODE and CMD_PARAM of the command you wish to execute (some
commands do not use CMD_PARAM) are input, and then the CST input is turned ON (leading edge is detected).
After the command is executed, ACK (execution successful) or NACK (execution failed) turns ON.
CST input when CMD_READY is OFF is ignored. In this case, neither ACK nor NACK is returned for CST.