LSI LASTEM Alpha-Log, Руководство пользователя

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Alpha-Log – User manual
LSI LASTEM SRL INSTUM_03388 Page 51 / 116
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Communication port : it is the serial port used for connection to one or more slave sensors.
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Speed : it is the serial port communication speed (must be same speed set on the slave sensor).
Default= 9600 bps.
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Parity : it is the parity used in communication. Default= None.
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Stop bits : it is a communication parameter. Default= 1.
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Timeout : it is the protocol waiting time after sending a request. Default= 1000 ms.
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Retries : it is the number of attempts to send the request after a timeout without reply. Default= 2.
During the configuration, the Modbus RTU parameters for reading the data must also be specified. Refer to
the sensor documentation for this.
The Modbus RTU parameters are as follows:
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Network address : it is the sensor address.
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Command : it is the data request command to the sensor. It can be Read Holding Register or Read
Input Register according to the sensor specifications.
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Register : it is the register containing the data to be read. The first register starts from the address
0x0000.
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Data format : it is the format of the data produced by the sensor. Alpha-Log supports the following
formats:
o
Floating : two 16-bit floating point registers. The byte ordering is defined by the Order of
bytes parameter .
o
Integer16 : 16-bit unsigned register.
o
Integer 16s : 16-bit signed register.
o
Integer32 : two consecutive unsigned 16-bit registers.
o
Integer32s : two consecutive 16-bit signed registers.
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Scale factor : for the integer data format, 16 or 32 bits, with or without sign, it is possible to specify
the division factor of the data to obtain a floating value.
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Order of bytes : in case the sensor has floating type data format, it is possible to define the ordering
of the 4 bytes ABCD that make up the data:
o
ABCD : default endian.
o
DCBA : little endian.
o
BADC : big endian.
o
CDAB : reverse endian.
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Define error value : if set to Yes, it enables the parameter Error value .
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Error value : is the value that the measure assumes in the event of an error. The default value
is -99999.