Vega VEGACOM 557 VEGA ASCII protocol Bedienungsanleitung PDF herunterladen (Seite 46)

46 VEGACOM 557 VEGA ASCII

5 Setup

5.1 Setup check list:

Proceed with the setup of VEGACOM 557

with VEGA ASCII as follows:

I. Check hardware requirements:

• VEGA ASCII-compatible Master compo-

nent

(Modus: RTU or ASCII)

• Check interface type (RS 232, RS 485,

RS 422 or TTY)

• VEGACOM 557 version "VEGA ASCII“

II. Carry out adjustments on VEGACOM

557 (DIL switch on additional board):

• Set resolution for VEGA ASCII

• Set value arrangement for VEGA ASCII

• Activate interface type

• Set parameter for interface

• Set VEGA ASCII address

III. Provide VEGA ASCII connection and

check communication:

• In case of correct communication, the

green LED marked "BA“ lights on VEGA-

COM 557.

Setup

5.2 Communication structure

Within the data communication between

VEGACOM 557 and the connected process-

ing system, the following functions are sup-

ported:

- Mode (VEGACOM 557 is slave)

VEGACOM 557 does not transmit data

without request. The Master has to request

all required data.

- Instrument address (default value # 1)

By using a bus-compatible interface (e.g.

RS 485) the operation of up to 9 instru-

ments on one interface is possible.

- Presentation:

All telegrams use ASCII characters and are

therefore readable as plain text.

- Time-based image:

There are no time periods required for

transmission.

- Value range (low resolution)

Independent of the actual position of the

decimal point, the value to be transferred is

provided with a decimal point at the penul-

timate position.

- Value range (high resolution)

The value to be transmitted is always

transferred without decimal point.

The decimal point as well as the unit of meas-

urement of the DCS value are not transferred

by VEGACOM 557!

This information must be completed by the

user in the software of the process data

processing.

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