Toshiba VF-AS1 General outlines of the communication function, BIT15 BIT8BIT7 BIT0, Bit Word

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1. General outlines of the communication function

This manual explains the RS485 communication function provided for the TOSVERT VF-AS1 series of industrial inverters.

(1)RS485 communication by the use of a two-wire RS485 communication port (standard function)

(2)RS485 communication by the use of a four-wire RS485 communication port (standard function)

(1)2-wire RS485 communication connector

(2)4wire RS485 communication connector

By using these communication functions in combination with the computer link function designed to establish a link between a higher level computing machine or controller (hereinafter referred to as a computer) and each inverter on the network, or with the inter-drive communication function that al- lows proportional control of inverters without using a computer, you can set up a network for data communication between inverters.

There are two communication protocols available: Toshiba Inverter Protocol and MODBUS-RTU Protocol (this command does not support all commands). To select a protocol, the communication protocol selection parameter f807 or f829 is used. (Refer to Section 3. Communication proto- col.)

<Computer link>

By preparing the program (explained later), the following information can be exchanged between the computer (host) and the inverter.

(1)Monitoring function (used to monitor the operating status of the inverter: Output frequency, current, voltage, etc.)

(2)Command function (used to issue run, stop and other commands to the inverter)

(3)Parameter function (used to set parameters and read their settings)

<Inter-drive communication function>

Master inverter sends the data, that is selected by the parameter, to all the slave inverters on the same network. This function allows a network construction in which a simple synchronous or proportional operation is possible among plural inverters (without the host computer).

As for data communication codes, the TOSVERT VF-AS1 series of inverters support the binary (HEX) code, in addition to the JIS (ASCII) code. A communication number is used to access the de- sired data item.

*The smallest unit of information that computers handle is called a “bit (binary digit),” which repre- sents the two numbers in the binary system: 1 or 0. A group of 16 bits is referred to as a “word,” which is the basic unit of information the VF-AS1 series of inverters use for data communication. One word can handle data items of 0 to FFFFH in hexadecimal notation (or 0 to 65535 in decimal notation).

BIT15 BIT8BIT7 BIT0

1 bit

1 word

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