Toshiba TOSVERT VF-AS3 Instruction Manual page 19

Rs485 communication function

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TOSHIBA inverter protocol

Set [F807: RS485 (1) protocol] or [F827: RS485 (2) protocol] to "0: TOSHIBA." In the default setting,

both [F807] and [F827] are set to "0: TOSHIBA."-> Refer to [4. Selecting communication protocol]

• Set the parameter of communication time-out

The devices cannot be stopped when a communication error occurs.

Mandatory

action

■ Data exchange with the inverter

The inverter is always waiting for receiving data and responds to requests from the computer.

The header code automatically determines ASCII mode or Binary mode.

ASCII mode

Binary mode

If the transmission format or inverter number is mismatched, the inverter causes a transmission

error and does not respond.

When the inverter number is added, communication is available only in broadcast

communication or if the inverter number is matched. If the inverter number is mismatched, the

inverter does not respond.

If [F803: RS485 (1) time-out time] or [F823: RS485 (2) time-out time] is set, a communication

time-out occurs when normal communication does not start within the set time. Set the inverter

operation when a communication timeout occurs in [F804: RS485 (1) time-out operation] or

[F824: RS485 (2) time-out operation] and the detection condition in [F808: RS485 (1) time-out

detection] or [F828: RS485 (2) time-out detection].-> Refer to [8. 3]

The inverter processes a received command and then returns data to the computer.

Details of the response time -> Refer to [A2. <Appendix 2> Response time]

• Communication is not possible for approx. two seconds after the power of the inverter body is

turned on until the initial setting is completed. If the control power goes off due to momentary

power failure, communication becomes temporarily unavailable.

Important

VF-AS3

CAUTION

Header code

"CR" (Carriage return)

"("

"2FH(/)"

5-1

Required

Not required

5. TOSHIBA inverter protocol

III