VEGA Modbus-TCP, ASCII protocol User Manual

Page 17

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17

2 ASCII protocol

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

30768-EN-130701

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: 14 characters
Note:

The % sign is a separator, not the unit %
Enquiry:

&001
Answer:

=001#-000673%

& Block enquiry

All assigned PC/DCS values in the instrument are delivered as reply

to the block enquiry. The measured value is transmitted with six deci-

mal places without decimal point and unit.

Number of bytes

Character

Identifier

1

&

End identification

1

CR

Identifier: "&" (1 character)

End identification: Carriage Return CR (1 sign)

Total length of the telegram: 2 characters
"N"-times repetition of the following telegram

(N=total number of assigned PC/DCS outputs)

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)

Value: Numerical value of the PC/DCS output or with interferred

measured value the text "FAULT"

Example:

Enquiry of the control

system

Reply from the signal

conditioning instrument

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