Toshiba Inverter Protocol - Toshiba TOSVERT VF-S11 Instruction Manual

4. TOSHIBA Inverter Protocol

Select "TOSHIBA Inverter Protocol" (=) in the communication protocol selection parame-
ters. "TOSHIBA Inverter Protocol" (=) is set for initial communication protocol selection of
shipment setting. (See "3. Communication protocol.")
■ Exchange of data between the computer and the inverter
In communications between the computer and the VF-S11 (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 start code is used to automatically identify the mode in which data is transmitted: ASCII
mode or binary mode.
A transmission error will result if the transmission format does not match.
■ ASCII mode
(1) In ASCII mode, the start code is "("
The inverter rejects all data items entered invalid the "(" If two or more "(" are entered, the "(" en-
tered last will be valid and all "(" entered before will be ignored. If the "(" is not recognized becau-
se of a format error or for any other reason, no error code will be returned since the data is not
recognized at all. In such cases, the inverter regards the data received as a transmission error,
rejects it and goes back into a start code wait state.
(2) When an inverter number is added behind the "(" communications will take place only in case of
broadcast communication or if the number matches up with that assigned to the inverters. If not,
the inverter will go back into a start code wait state.
(3) The inverter stops receiving data on receipt of the CR (carriage return) code inserted in the des-
ignated position.
If the size of the data transmitted exceeds the maximum allowable size (17 bytes) or if the CR
code cannot be found in the designated position within 0.5 seconds, the inverter will regard the
data received as a transmission error and go back into a start code wait state.
(4) If no communications take place within the time specified using the timer function, the computer
will regard it as a communication error and trip the inverter. The timer setting is cleared when the
timer is turned on or initialized. For more details, see Section 7.3, "Timer function."
(5) On executing the command received, the inverter returns data to the computer. For the response
time, see Appendix 2, "Response time."
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