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4. Toshiba inverter protocol
Select “TOSHIBA” (f829=0) in the communication protocol selection parameters. “TOSHIBA”
(f829=0) 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-S15 (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.
The judgment of ASCII mode or 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 pa-
rameter 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 re-
sponse time, see Appendix 2, “Response time”.
Note:
Communication is not available for
about one second (initialization) just after the power is supplied
to the inverter. If the control power is shut down due to an instantaneous voltage drop, communica-
tion is temporarily interrupted.
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