VEGA Modbus-TCP, ASCII protocol - Manual (Page 20)

20
2 ASCII protocol
Modbus-TCP, ASCII protocol • VEGAMET 391/624/625, VEGASCAN 693, PLICSRADIO C62
30768-EN-130701
(End-Start+1)-times repetition of the following telegram
Number of bytes Character
T1 1 =
DCS no. 3 001 … 030
T2 1 #
Value 5 … 6 -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)
•
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)
•
End identification: Carriage Return CR (1 sign)
Total length of the telegram: (End-Start+1)*14
Note:
The % sign is a separator, not the unit %
Enquiry:
&001-003
Answer:
=001# 000673%
=002# 008246%
=003#-000673%
2.8 Measured value enquiry with command?
? individual enquiry
The 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 with unit.
Number of bytes Character
Identifier 1 ?
Begin 1 … 3 001 … 030 or 1 … 30
End identification 1 CR
•
Identifier: "?" (1 character)
Reply from the signal
conditioning instrument
Example:
Enquiry of the control
system