Parker 590+ series - Control Character Definitions; Data Character Definitions

Serial Communications A-17
DC590+ Series DC Digital Drive
Control Character Definitions
Standard Control Character Definitions
(EOT) End of Transmission (commands the slave to stop transmitting and wait to be addressed)
(STX) Start of Text.
(ENQ) Enquiry (sent by the master as the last character of any type of polling message)
(ETX) End of Text (is followed by the checksum)
(ETB) End of Block (sent instead of (ETX) when replying to a multi parameter enquiry). It indicates the end of a block, but not the
end of a message.
(ACK) Positive Acknowledgement
(NAK) Negative Acknowledgement
Data Character Definitions
Standard Data Character Definitions
(INO) Instrument Number (contains the address of the slave drive and is equivalent to the combination of the GID, UID
characters of the ASCII mode)
(PNO) Parameter Number (equivalent to the combination of the (C1) and (C2) characters of the ASCII mode and is sent as a
hexadecimal number rather than two ASCII characters)
(D1), (D2)
and (D3)
These characters include the mode name and value read from, or to be written to, one of the parameters.
A data character is represented by setting its MSB (bit 7). The contents of these characters are as follows:
D1 : bits 2 [] 6 mode number
Number format is:
0 = XXXX
1 = XXX.X
2 = XX.XX
3 = X.XXX
4 = .XXXX
bits 0 and 1 bits 14 and 15 of the value.
D2 : bits 0 [] 6 bits 7 to 13 of the value.
D3 : bits 0 [] 6 bits 0 to 6 of the value.
(CCC) Connection Check Control (contains the checksum of all the characters following the (EOT) character in the message)
(BCC) Block Check Character (checksum value generated by taking the exclusive OR (XOR) of the ASCII values of all characters
transmitted after and excluding (STX) up to and including (ETX).