E6581315
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 (, , to ) 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)
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| Number of writing data groups x 2 bytes |
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(3.5bytes | Start |
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| CMD | Num- | Num- |
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| Write | Write | Write | Write | SUM | (3.5bytes | |||
Blank) | Code |
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| “X” | ber of | ber of |
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| data1 | data1 | data2 | data2 |
| Blank) | |
| “／” |
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| write | read |
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| High | Low | High | Low |
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| data | data |
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| groups | groups |
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Checksum Area
1.2FH(“/”) (1 byte) : Start code of binary mode
2.
Executed only when the inverter number matches the inverter number. Set on the panel, ex- cept in FFH (broadcast communication).
Communication data will be invalidated and data will not be returned either if the inverter number. Does not match.
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 re- turned.
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
Dummy data is needed if the number of write data groups is larger than 1 even though(none) is selected for
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
Dummy data is needed if the number of write data groups is 2 even though(none) is selected for
8. SUM (1 byte) : Checksum (Cannot be omitted) 00H to FFH
Lower two digits (1 byte) of total sum from start code (SUM value not included)
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