Transmission Format Of Block Communication - Toshiba TOSVERT VF-nC3 Instruction Manual

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What is block communication?

Data can be written in and read from several data groups set in one communication by setting the

type of data desired for communication in the block communication parameters (f870, f871,

f875 to f879) in advance. Block communication can save the communication time.

Data is transmitted hexadecimal using the binary (HEX) code transmission characters. "Computer

→ inverter" is for writing only, while "Inverter → computer" for reply is for reading only.

Computer → Inverter (Block Communication)

Omissible

(3.5bytes

Start

INV-NO

Blank)

Code

"／"

1. 2FH("/") (1 byte) : Start code of binary mode

2. INV-NO (1 byte) : Inverter number. (Can be omitted in 1:1 communication): 00H to 3FH, FFH

3. CMD (1 byte)

: 'X' (Block communication command)

4. Number of write data groups (1 byte)

: Specify the number of data groups to be written (00H to 02H).

If specified outside of the range, data will be treated as a format error and data will not be

returned.

5. Number of read data groups (1 byte)

: Specify the number of data groups to be read (00H to 05H).

If specified outside of the range, data will be returned as "Number of read data groups = 0"

when returned by the inverter.

6. Write data1 (2 bytes)

: Needed when the number of write data groups is larger than 1.

Data to be written to the specified parameter selected by f870.

Dummy data is needed if the number of write data groups is larger than 1 even

though(none) is selected for f870.

7. Write data2 (2 bytes)

: Needed when the number of write data groups is 2.

Data to be written to the specified parameter selected by f871.

Dummy data is needed if the number of write data groups is 2 even though(none) is se-

lected for f871.

8. SUM (1 byte)

: Checksum (Cannot be omitted) 00H to FFH

Num-

Num-

CMD

ber of

ber of

"X"

write

data

groups

groups

Executed only when the inverter number matches the inverter number. Set on the panel,

except in FFH (broadcast communication).

Communication data will be invalidated and data will not be returned either if the inverter

number. Does not match.

Lower two digits (1 byte) of total sum from start code (SUM value not included)

Number of writing data groups x 2 bytes

Write

Write

data1

data1

data2

read

High

Low

data

Checksum Area

13

E6581657

(3.5bytes

Write

Write

SUM

Blank)

data2

High

Low