VEGA Modbus-TCP, ASCII protocol - Manual (Page 21)

21
2 ASCII protocol
Modbus-TCP, ASCII protocol • VEGAMET 391/624/625, VEGASCAN 693, PLICSRADIO C62
30768-EN-130701
•
Start: No. of the requested PC/DCS output (1 … 3 characters)
•
End identification: Carriage Return CR (1 sign)
Total length of the telegram: 3 … 5 characters
Number of bytes Character
T1 1 =
DCS no. 3 001 … 030
T2 1 #
Value 7 -000673
T3 1 #
Unit 0 … n xxx
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 … 7 6-digit number after the decimal point
•
T3: "#" (1 character)
•
Unit: Unit as text (0 … n unit)
•
End identification: Carriage Return CR (1 sign)
Total length of the telegram: 14 characters+Unit character
Enquiry:
?001
Answer:
=001# 000673#%
? Block enquiry
All assigned PC/DCS values in the instrument are delivered as reply
to the block enquiry. The measured value is transmitted with six deci-
mal places without decimal point and with unit.
Number of bytes Character
Identifier 1 ?
End identification 1 CR
•
Identifier: "?" (1 character)
•
End identification: Carriage Return CR (1 sign)
Total length of the telegram: 2 characters
Reply from the signal
conditioning instrument
Example:
Enquiry of the control
system