Toshiba TOSVERT VF-S11 Gebrauchsanleitung

E6581222

32

MODBUS-RTU sends and receives binary data without a frame-synchronizing start code and defines
the blank time to recognize the start of a frame.  MODBUS-RTU decides the data that is first re-
ceived subsequently as the first byte of a frame after a blank time for 3.5 bytes at the on-going com-
munication speed.

■ Computer → VF-S11    *The text size is 8 bytes fixed.

(3.5bytes

Blank)

Inverter

No.

Command

Commu-

nication

No.

(high)

Commu-

nication

No.

(low)

Number

of Data
Groups

(high)

Number

of Data
Groups

(low)

CRC
(low)

CRC

(high)

(3.5bytes

Blank)

03

00

01

1) Inverter No.. (1 byte)

: Specify an inverter number between 0 and 247 (00H to F7H).

Command processing will be executed only broadcast communication “0” and with
those inverters that match set inverter numbers.  Data will not be returned if “0”
(broadcast communication) and inverter numbers do not match.

2) Command (1 byte)

: Set the read command (03H fixed).

3) Communication No.. (2 bytes)

: Set in the order of high to low numbers.

4) Number of data groups (2 bytes) : Set the number of data words 0001 (fixed) in the order of high to low numbers.

5) CRC (2 bytes)

:  Set  generation  results  of  CRC  in the order of low to high numbers..  For the

method to generate CRC, see “5.2 CRC Generation.”  Note that the setting se-
quence is reversal to that of others.

■ VF-S11 → Computer (Normal return)  *The text size is 7 bytes fixed.

(3.5bytes

Blank)

Inverter

No.

Command

Number of

Data

Read data

(high)

Read data

(low)

CRC
(low)

CRC

(high)

03

02

1) Command (1 byte)

: Read command (03H fixed) will be returned.

2) Number of data

: A number of data bytes (02H fixed) will be returned.  The number of data groups for

transmission to the inverters is 2 bytes and 01H fixed.  Note that the number of data re-
turned by the inverters is 1 byte and 02H fixed.

3) Read data (2 bytes)

: Returned in the order of read data (high) and (low).

■ VF-S11 → Computer (Abnormal return)  *The text size is 5 bytes fixed.

(3.5bytes

Blank)

Inverter No. Command Error Code

CRC
(low)

CRC

(high)

83

1) Command (1 byte)

: 83H fixed (Read command error) (Command + 80H)

2) Error code (1 byte)

: See “4.3 Transmission errors.”

■  Example: Reading output frequency  (During 60Hz operation)
 (Computer → inverter) 

01 03 FD 00 00 01 B5 A6

 (Inverter → computer) 

01 03 02 17 70 B6 50

■  Example: Data specification error
 (Computer → inverter) 

01 03 FD 00 00 02 F5 A7

 (Inverter → computer) 

01 83 03 01 31