Transmission Format Of Block Communication - Toshiba TOSVERT VF-FS1 Instruction Manual

4.1.3. Transmission Format of Block Communication

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 (
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 Communications)
Start
Code
"／"
1. 2FH("/") (1 byte) : Start code of binary mode
2. INV-NO (1 byte) : Inverter number. (Can be omitted in 1:1 communications): 00H to 3FH, FFH
3. CMD (1 byte)
4. Number of write data groups (1 byte)
5. Number of read data groups (1 byte)
6. Write data1 (2 bytes)
7. Write data2 (2 bytes)
8. SUM (1 byte)
to ) in advance. Block communications can save the communication time.
Omissible
Num-
INV-NO CMD
ber of
"X"
write
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.
: 'X' (Block communication command)
: 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.
: 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.
: Needed when the number of write data groups is larger than 1.
Data to be written to the specified parameter selected by
Dummy data is needed if the number of write data groups is larger than 1 even
though(none) is selected for
: Needed when the number of write data groups is 2.
Data to be written to the specified parameter selected by
Dummy data is needed if the number of write data groups is 2 even though(none) is se-
lected for
: Checksum (Cannot be omitted) 00H to FFH
Lower two digits (1 byte) of total sum from start code (SUM value not included)
Number of writing data groups x 2 bytes
Num-
Write
ber of
data1
read
High
data data
groups
Checksum Area
14
Write Write Write
data1 data2 data2
Low High Low
E6581393
, ,
SUM