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RS485 Protocol C-5
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”.
“Drive Number” is the number of the drive and is indicated in 2 byte ASCII-HEX.
(ASCII-HEX: Hexadecimal consists of ‘0’ to ‘9’, ‘A’ to ‘F)
CMD: Capital letter
Data: ASCII-HEX
Example: when data value is 3000: 3000 (dec) ‘0’ ‘B’ ‘B’ ‘8’h 30h 42h 42h 38h
Error code: ASCII (20h to 7Fh)
Receive/Send buffer size: Receive= 39 byte, Send=44 byte
Monitor register buffer: 8 Word
SUM: to check the communication error
SUM= ASCII-HEX format of lower 8 bit of (Drive No. + CMD + DATA)
Example: Command Message (Request) to read one address from address “3000”
SUM = ‘0’ + ‘1’ + ’R’ + ‘3’ + ‘0’ + ‘0’ + ‘0’ + ‘1’
=30h + 31h + 52h + 33h + 30h + 30h + 30h + 31h
= 1A7h (Control values such as ENQ/ACK/NAK are excluded.)
Character ASCII-HEX Command
R 52h Read
W 57h Write
X 58h Request for monitoring
Y 59h Action for monitoring
ENQ Drive
No
CMD Address Number of address to
read
SUM EOT
05h “01” “R” “3000” “1” “A7” 04h
1 byte 2 bytes 1 byte 4 bytes 1 byte 2 1