Product manual

TAC Xenta Server – Gateway, Technical Manual B Protocols

Schneider Electric Buildings AB, June 2011 135 (184)

04-00124-06-en

• Coefficient Gain and Offset – Allow the raw register value to be

converted into the desired absolute units. If the raw register value

is a real number then normally no conversion is necessary and the

default gain and offset of 1 and 0 can be used. But if the raw regis-

ter value is an integer then it often needs to have a gain and offset

applied.

As an example, to pass a control system value representing voltage

to the master through an unsigned integer register requires the

actual voltage to be multiplied by 10 if 1 digit of resolution is

required. In this case the Xenta 913’s gain should be set to 0.1 to

convert the raw units (10*V) into the required absolute units (V).

• Signal DataType – Is set to a default of BOOL, INTEGER or

REAL based on the selected register type. But the default data

type may subsequently need to be changed to suit the applied con-

version coefficient. For example, if a gain of 0.1 is applied to an

integer it will produce a real value, so the default DataType would

be changed to REAL in this case.

• Signal Measurement System – The measurement system param-

eters need to be manually set to match the absolute form of the

being either an enumeration or analogue engineering unit as appli-

cable.