LSIS iG5H Series, Manual

Page: 192 / 225

RS485 communication
179
Com
munic
ation
Detail communication protocol
1) Request for Read: Request for read successive
‘N’ numbers of WORD from
address
“XXXX”
ENQ Drive No CMD Address
Number of
address to read
SUM EOT
05h
“01” -
“1F”
“R” “XXXX” “1” - “8” = n “XX”
04h
1 byte 2 bytes 1 byte 4 bytes 1 byte 2 bytes 1 byte
Total bite = 12
The quotation marks (
“ ”) means character.
1.1) Acknowledge Response:
ACK Drive No CMD Data SUM EOT
06h
“01” - “1F” “R” “XXXX” “XX”
04h
1 byte 2 bytes 1 byte N * 4 bytes 2 byte 1 byte
Total bite = 7 + n * 4 = Max 39
1.2) Negative Acknowledge Response:
NAK Drive No CMD Error code SUM EOT
15h
“01” - “1F” “R” “**” “XX”
04h
1 byte 2 bytes 1 byte 2 bytes 2 bytes 1 byte
Total bite = 9
2) Request for Write:
ENQ Drive No CMD Address
Number of
address to
read
Data SUM EOT
05h
“01”- “1F” “W” “XXXX” “1” - “8” = n “XXXX…” “XX”
04h
1 byte 2 bytes 1 byte 4 bytes 1 byte n * 4 bytes 2 byte 1 byte
Total bite = 12 + n * 4 = Max 44
2.1) Acknowledge response:
ACK Drive No CMD Data SUM EOT
06h
“01” - “1F” “W” “XXXX…” “XX”
04h
1:byte 2:bytes 1:byte n * 4 bytes 2 bytes 1 byte
Total bite = 7 + n * 4 = Max 39
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