Transmission Format Of Block Communication - Toshiba Tosvert VF-S15 Series 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 (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).
5. Number of read data groups (1 byte)
: Specify the number of data groups to be read (00H to 05H).
6. Write data1 (2 bytes)
: Needed when the number of write data groups is larger than 1.
7. Write data2 (2 bytes)
: Needed when the number of write data groups is 2.
8. SUM (1 byte) : Checksum (Cannot be omitted) 00H to FFH
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Num-
CMD
ber of
"X"
write
data
groups
Communication performs only when the inverter number is matched. Broadcast communica-
tion is FFH.
Communication data will be invalidated and data will not be returned either if the inverter
number does not match.
If specified outside of the range, data will be treated as a format error and data will not be
returned.
If specified outside of the range, data will be returned as "Number of read data groups = 0"
when returned by the inverter.
The data is 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.
The data is 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.
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 Write
ber of
data1 data1
read
High Low
data
groups
Checksum Area
13
E6581913
(3.5bytes
Write Write SUM
data2 data2
High Low
Not omissible
Blank)