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8.7 Time-out operation
The master station transmits EOT when the slave station does not start reply operation (STX is not
received) 300[ms] after the master station has ended communication operation. 100[ms] after that, the
master station retransmits the message. Time-out occurs if the slave station does not answer after the
master station has performed the above operation three times. (Communication error)
Controller
(Master station)
Servo
(Slave station)
8.8 Retry operation
When a fault occurs in communication between the master and slave stations, the error code in the
response data from the slave station is a negative response code ([B] to [F], [b] to [f]). In this case, the
master station retransmits the message which was sent at the occurrence of the fault (Retry operation). A
communication error occurs if the above operation is repeated and results in the error three or more
consecutive times.
Controller
(Master station)
Servo
(Slave station)
Similarly, when the master station detects a fault (e.g. checksum, parity) in the response data from the
slave station, the master station retransmits the message which was sent at the occurrence of the fault. A
communication error occurs if the retry operation is performed three times.
100ms
300ms
E
O
T
S
T
X
Station number
or
group
100ms
300ms
E
O
T
S
T
X
Station number
or
group
54
100ms
300ms
E
O
T
S
T
X
Station number
group
Time-out
300ms
Communication error
or
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