Vega Modbus-TCP, ASCII protocol Bedienungsanleitung PDF herunterladen (Seite 24)

2 ASCII protocol

Modbus-TCP, ASCII protocol • VEGAMET 391/624/625, VEGASCAN 693, PLICSRADIO C62

30768-EN-130701

Number of bytes Character

Identier 1 ?

Begin 1 … 3 001 … 030 or 1 … 30

Separator 1 -

End 1 … 3 001 … 030 or 1 … 30

End identication 1 CR

•

Identier: "?" (1 character)

•

Start: Start no. of the requested PC/DCS output (1 … 3 charac-

ters)

•

Separator: "-" (1 sign)

•

End: End no. of the requested PC/DCS output (1 … 3 characters)

•

End identication: Carriage Return CR (1 sign)

Total length of the telegram: 5 … 9 characters

(End-Start+1)-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 identication 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 "FAU LT "

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 identication: Carriage Return CR (1 sign)

Total length of the telegram: (End-Start+1)*(14 characters+Unit

character)

Enquiry:

?001-003

Answer:

Enquiry of the control

system

Reply from the signal

conditioning instrument

Example:

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 30 31 32

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