LS SV-xxx-iP5A-2, Руководство пользователя

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Chapter 8
– RS485 Communication
8-5
2) Description :
*
Request starts with “ENQ” and ends with “EOT”.
*
Acknowledge Response starts with “ACK” and ends with “EOT”.
*
Negative Acknowledge Response starts with ”NAK” and ends with “EOT”.
*
“Inverter Number” is the number of Inverters used and indicated in 2 bytes ASCII-
HEX. (ASCII-HEX
: Hexadecimal consists of ‘0’ ~ ‘9’, ‘A’ ~ ‘F)
* CMD
: Capital letter (“IF Error” when small letter is used.)
Character ASCII-HEX Command
‘R’
52h Read
‘W’
57h Write
‘X’
58h
Request for monitoring registration
‘Y’
59h
Execution for monitoring registration

Data : ASCII-HEX
Ex) when data value is 3000 : 3000 (dec)
→ ‘0’ ’B’ ’B’ ’8’h → 30h 42h 42h
38h

Error code : ASCII (20h ~ 7Fh)

Receive/Send buffer size : Receive= 39 bytes, Send=44 bytes

Monitor register buffer : 8 Word

SUM : to check the communication error
SUM= ASCII-HEX format of lower 8 bit of (Inverter No. + CMD + DATA)
Ex) Command Message (Request) for reading one address from address
“9000”
ENQ
Inverter
No.
CMD Address
Number of
address to
read
SUM EOT
05h
“01” “R” “9000” “1” “AD”
04h
1 byte 2 bytes 1 byte 4 bytes 1 byte 2 bytes 1 byte
SUM = ‘0’ + ‘1’ + ’R’ + ‘9’ + ‘0’ + ‘0’ + ‘0’ + ‘1’
= 30h + 31h + 52h + 39h + 30h + 30h + 30h + 31h
= 1ADh (except for ENA/ACK/EOT value)
8.4.2 Detail communication protocol
1) Request for Read:
Request for read successive ‘N’ numbers of WORD from
address “XXXX”
ENQ Inv. No. CMD Address
Number of
Address
SUM EOT
05h
“01” ~ “FA” “R” “XXXX” “1” ~ “8” = n “XX”
04h
1 byte 2 bytes 1 byte 4 bytes 1 byte 2 bytes 1 byte
Total bytes = 12
The quotation marks (“ ”) mean character.