Dwyer 4C - Manual (Page 17)

Communication Protocol
Command code to read N words: 03H. The maximum value of N is 3.
For example, in order to read two words from controller 01 (address 01H)
at starting data address 4700H, the command in ASCII mode is:
ASCII mode:
Command message: Response message:
LRC check:
LRC check is the added sum from “Address” to Data content”. For
example, 01H + 03H + 47H + 00H + 00H + 02H = 4DH, then take the
complementary of 2, B3H.
Command code to write 1 word: 06H
For example, in order to write 1000 (03E8H) in controller 01 (comm.
address 01H) at starting data address 4701H, the command is ASCII
mode is:
ASCII mode:
Command message: Response message:
STX
ADR1
ADR0
CMD1
CMD0
Starting
data
address
Number of data
(count by word)
LRC CHK 1
LRC CHK 0
END 1
END 0
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‘:’
‘0’
‘1’
‘0’
‘3’
‘4’
‘7’
‘0’
‘0’
‘0’
‘0’
‘0’
‘2’
‘B’
‘3’
CR
LF STX
ADR1
ADR0
CMD1
CMD0
Number of data
(count by byte)
Content of start
address 4700H
Content of start
address 4700H
LRC CHK 1
LRC CHK 0
END 1
END 0
‘:’
‘0’
‘1’
‘0’
‘3’
‘0’
‘4’
‘0’
‘1’
‘9’
‘0’
‘0’
‘0’
‘0’
‘0’
‘6’
‘7’
CR
LF
STX
ADR1
ADR0
CMD1
CMD0
Starting
data
address
Data Content
LRC CHK 1
LRC CHK 0
END 1
END 0
‘:’
‘0’
‘1’
‘0’
‘6’
‘4’
‘7’
‘0’
‘1’
‘0’
‘3’
‘E’
‘8’
‘C’
‘6’
CR
LF STX
ADR1
ADR0
CMD1
CMD0
Starting
data
addresses
Data Content
LRC CHK 1
LRC CHK 0
END 1
END 0
‘:’
‘0’
‘1’
‘0’
‘6’
‘4’
‘7’
‘0’
‘1’
‘0’
‘3’
‘E’
‘8’
‘C’
‘6
CR
LF