VEGA Modbus-TCP, ASCII protocol - Manual (Page 18)

18
2 ASCII protocol
Modbus-TCP, ASCII protocol • VEGAMET 391/624/625, VEGASCAN 693, PLICSRADIO C62
30768-EN-130701
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)
•
End identification: Carriage Return CR (1 sign)
Total length of the telegram: N*14 characters
Note:
The % sign is a separator, not the unit %
Enquiry:
&
Answer:
=001# 000673%
=002# 008246%
=003#-000673%
=004#-008246%
& Block enquiry with length
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 unit.
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 -000673
Example:
Enquiry of the control
system
Reply from the signal
conditioning instrument