Honeywell VFD CORE

CHAPTER 12: DESCRIPTION OF PARAMETER SETTINGS
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2. Communication Protocol
Communication Data Frame
ASCII mode?
RTU mode?
STX Start character = ‘:’ (3AH)
Address Hi Communication Address
8-bit address consists of 2 ASCll codes
Address Lo
Function Hi Command code:
8-bit command consists of 2 ASCII codes
Function Lo
DATA (n-1) Contents of data:
Nx8-bit data consist of 2n ASCII codes
n≤ 16, maximum of 32 ASCII codes
…….
DATA 0
LRC CHK Hi LRC check sum:
8-bit check sum consists of 2 ASCII codes
LRC CHK Lo
END Hi End characters:
END1= CR (0DH), END0= LF(0AH)
END Lo
START A silent interval of more than 10 ms
Address Communication address: 8-bit address
Function Command code: 8-bit command
DATA (n-1) Contents of data:
n×8-bit data, n≤16
…….
DATA 0
CRC CHK Low CRC check sum:
16-bit check sum consists of 2 8-bit characters
CRC CHK High
END A silent interval of more than 10 ms
M33764
012345
6
7- DATA BITS
DATA FORMAT 7, E, 1
START
BIT
EVEN
PARITY
STOP
BIT
10- BIT CHARACTER FRAME
012345
6
7- DATA BITS
DATA FORMAT 7, O, 1
START
BIT
ODD
PARITY
STOP
BIT
10- BIT CHARACTER FRAME
012345
6
7
8- DATA BITS
DATA FORMAT 8, N, 2
START
BIT
STOP
BIT
STOP
BIT
11- BIT CHARACTER FRAME
012345
6
7
8- DATA BITS
DATA FORMAT 8, E, 1
START
BIT
STOP
BIT
11- BIT CHARACTER FRAME
012345
6
7
8- DATA BITS
DATA FORMAT 8, O, 1
START
BIT
STOP
BIT
11- BIT CHARACTER FRAME
EVEN
PARITY
ODD
PARITY