VEGA Modbus-TCP, ASCII protocol - Manual (Page 23)

23
2 ASCII protocol
Modbus-TCP, ASCII protocol • VEGAMET 391/624/625, VEGASCAN 693, PLICSRADIO C62
30768-EN-130701
Number of bytes Character
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 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: Number*(14 characters+Unit character)
Enquiry:
?001L003
Answer:
=001# 000673#%
=002# 008246#kg
=003#-000673#m
? Block enquiry with range
The range stated in the enquiry with PC/DCS values is delivered as
reply to the range enquiry. The measured value is transmitted with six
decimal places without decimal point and with unit.
Reply from the signal
conditioning instrument
Example: