IAI America TTA - Manual (Page 9)

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Message Transmission Timing
Under the basic transmission control procedure, one unit of transmission consists of command transmission from the master
station (host) and response transmission from the receiving slave station (controller). The switching timing of transmission
between the master station and slave station conforms to the following rules:
(1) Minimum delay time after completion of command reception by the slave station (controller) before start of response
transmission =
 msec
 is the setting of "I/O parameter No. 97: User-open SIO channel xx, IAI-protocol response minimum delay time" (xx:
see Notes). (this parameter is available in X-SEL-J/K main application V0.26 or later). The slave station (controller) will
start sending a response message when this time has elapsed after completing the reception of a command message.
The master station (host) must become reception-ready within this time after completing the transmission of a
command message.
(2) Minimum delay time after completion of response reception by the master station (host) before start of command
transmission = 1 msec
The slave station (controller) will become reception-ready within this time after completing the transmission of a
response message. The master station (host) must start sending the next command message only when this time has
elapsed after completing the reception of a response message.
Notes
• If the slave station (controller) cannot recognize command messages (reception error, header/station number/line feed (LF)
error, sum check error, etc.) from the master station (host), response transmission is not performed. Referring to “5,
Timeout and Retry," perform communication recovery or take other applicable measures on the master station (host).
• xx in "I/O parameter No. 97: User-open SIO channel xx, IAI-protocol response minimum delay time" above denotes a
channel number. For details, see page 7.