Vega VEGACOM 557 Modbus protocol Bedienungsanleitung PDF herunterladen (Seite 44)

44 VEGACOM 557 Modbus

Start

Slave

ad-

dress

Func-

tion

code

Address of

1. register

word

No. of

words

Error

Check

End

Number

of Bytes

Value

range

Meaning

Structure of the meas. value enquiry Modbus-Master to VEGACOM 557

ASCII enquiry telegram acc. to measured values (function code 04)

12 2 4 4 2 2

: 1 .. 247 04 0 ... 65.509 1 ... 127 LRC CR LF

Start

Slave

address

Function

code

No. of

data

bytes

Error

Check

End

No. of

Bytes

Value

range

Meaning

Structure of the answer VEGACOM 557 to Modbus-Master

ASCII answer telegram (function code 04)

Data (DCS values)

DCS value 1 of

VEGAMET #2:

Status: 0x00

Unit: 0x00

Meas. value:

0x014A

= 3.30%

Data transmission with Modbus ASCII

104 00

CR LF

01 04 04 0

XXCRLF

2 2 8 (per DCS value)

1 .. 247

04 2 ... 254

LRC CR LF

Procedure with Modbus-Master-simulation (e.g. PC)Procedure with Modbus-Master-simulation (e.g. PC)

Procedure with Modbus-Master-simulation (e.g. PC)

In case the data enquiry should be made via a Modbus-Master-simulation, this can be done,

for example, via a self-written communication driver using the "Function code 04 = Read Input

Registers“. The following demonstration should explain the communication processes between

Modbus-Master and VEGACOM 557 on the Modbus.

Example for data from VEGAMET 514:

A DCS value should be collected from VEGAMET #2 (DCS output 1). VEGACOM 557 operates

in mode "Sort measured values acc. to VEGAMET addresses“. The Slave-address of VEGA-

COM 557 is set to 1.

Current meas. value on VEGAMET DCS output 1 is: 3.30% (= 0x014A)

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 67 68

Kommentare zu diesen Handbüchern

Keine Kommentare

Vega VEGACOM 557 Modbus protocol Bedienungsanleitung Seite 44

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Kommunikationszubehör Vega VEGACOM 557 Modbus protocol