VEGA Modbus-TCP, ASCII protocol - Manual (Page 14)

14
2 ASCII protocol
Modbus-TCP, ASCII protocol • VEGAMET 391/624/625, VEGASCAN 693, PLICSRADIO C62
30768-EN-130701
Number of bytes Character
Identifier 1 %
Begin 1 … 3 001 … 030 or 1 … 30
Separator 1 L or I
Quantity 1 … 3 001 … 030 or 1 … 30
End identification 1 CR
•
Identifier: "%" (1 character)
•
Start: No. of the requested PC/DCS output (1 … 3 characters)
•
Separator: "L" or "I" (1 sign)
•
Quantity: Number of requested PC/DCS outputs (1 … 3 signs)
•
End identification: Carriage Return CR (1 sign)
Total length of the telegram: 5 … 9 characters
"N"-times repetition of the following telegram
Number of bytes Character
T1 1 =
DCS no. 3 001 … 030
T2 1 #
Value 5 … 6 -067.3
T3 1 %
End identification 1 CR
•
T1: "=" (1 character)
•
DCS no.: No. of the PC/DCS output as 3-digit decimal number
•
T2: "#" (1 character)
•
Value: Numerical value of the PC/DCS output or with interferred
measured value the text "FAULT"
Formatting of the value:
Character Meaning
1 "- ": Minus with negative numbers
" ": Space with positive numbers
2 … 4 3-digit number
5 ".": Decimal point
6 1-digit number (after the decimal point)
•
T3: "%" (1 character)
•
End identification: Carriage Return CR (1 sign)
Total length of the telegram: "Number"*12 … 13 signs
Note:
The % sign is a separator, not the unit %
Enquiry:
%001L003
Enquiry of the control
system
Reply from the signal
conditioning instrument
Example: