Toshiba TOSVERT VF-AS1 instruction manual Data transmission specifications, BIT2

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2. Data transmission specifications

Items	Specifications
Transmission scheme	Half-duplex	*: Standard
Synchronization scheme	Start-stop synchronization	default setting
Communication baud rate	9600/19200*/38400 bps (selectable using a parameter) *1
Communication protocol	TOSHIBA Inverter Protocol * / MODBUS-RTU (selectable using a parameter) *1
Character transmission	<ASCII mode> JIS X 0201 8-bit (ASCII)
	<Binary mode, MODBUS-RTU> Binary codes fixed to 8 bits
Stop bit length	Received by inverter: 1 bit, Sent by inverter: 2 bits *3
Error detecting scheme	Parity *2: Even */Odd/Non parity (selectable using a parameter) *1,
	checksum(Toshiba inverter protocol), CRC(MODBUS-RTU)
Character transmission	11-bit characters *1 (Stop bit=1, with parity)
format
Order of bit transmission	Low-order bits transmitted first
Frame length	Variable (to a maximum of 17 bytes)

*1: Changes to setting do not take effect until the inverter is turned back on or reset.

*2: JIS-X-0201 (ANSI)-compliant 8-bit codes are used for all messages transmitted in ASCII mode and vertical (even) parity bits specified by JIS-X-5001 are added to them. These even parity bits can be changed to odd parity bits by changing the parameter setting (a change to the parameter setting does not take effect until the inverter has been reset.)

*3: Here are the default character transmission format.

Characters received: 11 bits (1 start bit + 8 bits + 1 parity bit + 1 stop bit)

START BIT

BIT0 BIT1 BIT2 BIT3 BIT4 BIT5 BIT6

PARITY STOP

BIT7 BIT BIT

The inverter receives one stop bit.

(The computer can be set so as to send 1, 1.5 or 2 stop bits.)

Characters sent: 12 bits (1 start bit + 8 bits + 1 parity bit + 2 stop bits)

START

BIT

BIT0 BIT1

BIT2

BIT3 BIT4 BIT5 BIT6 BIT7

PARITY STOP STOP

BIT BIT BIT

The inverter sends two stop bits.

(The computer can be set so as to receive 1, 1.5 or 2 stop bits.)

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