Delta A Series - Communication Protocol Commands; ASCII Read Command Example; ASCII Write Command Example

- 9 -
 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:
STX ‘:’ STX ‘:’
‘0’ ‘0’
ADR1
ADR0
‘1’
ADR1
ADR0
‘1’
‘0’ ‘0’
CMD1
CMD0
‘3’
CMD1
CMD0
‘3’
‘4’ ‘0’
‘7’
Number of data
(count by byte)
‘4’
‘0’ ‘0’
Starting data address
‘0’ ‘1’
‘0’ ‘9’
‘0’
Content of start address
4700H
‘0’
‘0’ ‘0’
Number of data (counted by
word)
‘2’ ‘0’
‘B’ ‘0’
LRC CHK 1
LRC CHK 0
‘3’
Content of start address
4701H
‘0’
CR ‘6’
END 1
END 0
LF
LRC CHK 1
LRC CHK 0
‘7’
CR
END 1
END 0
LF
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 the starting data address 4701H, the command in ASCII mode
is:
ASCII mode:
Command message: Response message:
STX ‘:’ STX ‘:’
‘0’ ‘0’
ADR1
ADR0
‘1’
ADR1
ADR0
‘1’
‘0’ ‘0’
CMD1
CMD0
‘6’
CMD1
CMD0
‘6’
‘4’ ‘4’
‘7’ ‘7’
‘0’ ‘0’
Starting data address
‘1’
Starting data address
‘1’
‘0’ ‘0’
‘3’ ‘3’
‘E’ ‘E’
Data content
‘8’
Data content
‘8’
‘C’ ‘C’
LRC CHK 1
LRC CHK 0
‘6’
LRC CHK 1
LRC CHK 0
‘6’
CR CR
END 1
END 0
LF
END 1
END 0
LF