UNION Instruments GmbH
INCA Analyzer Series
– Instruction Manual
Page 40 of 59
Output option
6
O
UTPUT OPTION
The INCA Analyzer can be configured to output the main measurement data through a RS-
232 connection. As an option this data can be distributed to field bus devices such as
Profibus-DP, Modbus RTU, etc.
6.1
Auto-output implementation
6.1.1
Data structure
The transmitted data will be sent in a data block of 240 bytes in size. This amount of data
suits the size of a Profibus-DP telegram.
To enable the detection of a data block with a fieldbus device the 240 bytes are sent within a
frame (header and tail):
Figure 6-1: Data structure with a frame
Header und tail of the frame are filtered using a HMS Anybus-Communicator (ABC) field bus
module and will therefore not be displayed in the data buffer of the device. If data is received
directly through a RS-232 connection the header and the tail need to be filtered or ignored by
the receiving program.
The 240 bytes are represented in the following structure (ANSI C - notation) and are sent in
the Intel format (Little-Endian or LSB first
– least significant byte first):
ST_TIME_INT
dateTime;
_WORD currChnl;
_WORD
currValues[10];
_WORD
enclosureTemp;
_WORD
ambPressure;
_BYTE
relayServiceRequest[6];
_WORD
status;
_WORD
fatalErrorMessage;
_WORD
errorMessages[10];
_BYTE dataValid;
_WORD
airPumpPressure;
_WORD
gasPumpPressure;
_BYTE
measureState;
_DWORD
secondsInState;
_BYTE dataValidDiscontChnls;
_WORD
gasCoolerTemp;
_WORD
irTemp;
_WORD
paroxState;
_WORD
outerCaseTemp;
_BYTE
useValidFlagDiscontChnls;
_BYTE
reserve[156];
Frame header
1 Byte (0xAA)
Data block
240 Bytes
Frame tail
1 Byte (0xAA)
