VEGA Modbus-TCP, ASCII protocol - Manual (Page 16)

16
2 ASCII protocol
Modbus-TCP, ASCII protocol • VEGAMET 391/624/625, VEGASCAN 693, PLICSRADIO C62
30768-EN-130701
Character Meaning
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: (End-Start+1)*12 … 13
Note:
The % sign is a separator, not the unit %
Enquiry:
%002-004
Answer:
=002# 067.3%
=003# 824.6%
=004#-067.3%
2.7 Measured value enquiry with command &
& Single enquiry
As answer to the individual enquiry, the PC/DCS value stated in the
enquiry is deThe PC/DCS value stated in the enquiry is delivered as
reply to the individual 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
End identification 1 CR
•
Identifier: "&" (1 character)
•
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 %
End identification 1 CR
•
T1: "=" (1 character)
•
DCS no.: No. of the PC/DCS output as 3-digit decimal number
•
T2: "#" (1 character)
Example:
Enquiry of the control
system
Reply from the signal
conditioning instrument