VEGA VEGACOM 557 VEGA ASCII protocol - Manual (Page 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.