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■ Data Exchange with Inverters
The inverters are always ready to receive messages and perform slave operation in response to
computer requests.
A transmission error will result if the transmission format does not match. The inverters will not re-
spond if a framing error, parity error, CRC error or an inverter number mismatch occurs.
If no response is received, the computer side recognizes that a communication error has occurred.
Transmit data again.
(1) In case spacing for more than 3.5 bytes are provided before characters, all data immediately
preceding it will be aborted. Data will sometimes be aborted if spacing for 1.5 bytes or more is
provided between characters.
(2) Communications will be effective only when inverter numbers match or the communication mode
is broadcast communications. No response will be made if inverter numbers do not match.
(3) Message reception will end if spacing for more than 3.5 bytes are provided at the end of charac-
ters.
(4) If no communications take place within the time specified using the timer function, the computer
will assume that a communication error has occurred and trip the inverter. The timer function is
disabled when the inverter is turned on or initialized. For details, see Section 7.3, “Timer func-
tion.”
(5) On executing the command received, the inverter returns data to the computer. For the response
time, see Appendix 2, “Response time.”
■ Caution:
Communication is not possible for about one second after the power is supplied to the inverter until
the initial setting is completed. If the control power is shut down due to an instantaneous voltage drop,
communication is temporarily interrupted.