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4. TOSHIBA Inverter Protocol
Select “TOSHIBA” (
,
=
) in the communication protocol selection parameters.
“TOSHIBA” (
,
=
) is set for initial communication protocol selection of shipment
setting. (See “3. Communication protocol.”)
Exchange of data between the computer and the inverter
In communication between the computer and the VF-AS1 (hereinafter referred to as the inverter),
the inverter is always placed in wait states and acts as a slave that operates on a request from the
computer.
A discrimination between ASCII mode and binary mode is automatically made with the start code.
Start code
“CR” (carriage return)
ASCII mode
“(”
Required
Binary mode
“2FH(/) ”
Not required
(1) If there is no transmission format or the inverter number that matches, an error occurs and no
response is returned.
(2) When an inverter number is added behind the “(” communication will take place only in case of
broadcast communication or if the number matches up with that assigned to the inverters.
(3) When a time-out period is specified with parameter
f803
(communication time-out time), a
time-out occurs if communication do not terminate normally within the specified time. With
parameter
f804
(communication time-out action), you can specify what the inverter should do
if a time-out occurs. For details, refer to Section 7.3.
(4) On executing the command received, the inverter returns data to the computer. For the response
time, see Appendix 2, “Response time.”
Note
Communication is not possible for about two seconds 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.
