Cambium Networks cnReach N500 Handleiding (253 Pagina's)

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cnReach N500 User Guide System Configuration

phn-4980_001v004 August 2019)

2-64

Each value has a number of transformations that can be applied: format, slope, offset, and special. The

ormat field defines how to treat the incoming bytes from the Modbus response. Coils and Discretes do

not have the format option, all incoming data is treated as a single bit by definition. After the incoming

data is translated to the internal format (double), the slope and offset is applied (y=mx+b). Next step is

applying the special transformation. This consists of any arbitrary math equation, of the form f(x), where

x is the input value. Examples are “!x”, to invert the incoming data, “123*x+456”, a slope/offset

calculation (though better handled by the defined slope/offset fields), etc.

Incoming data (bits or registers)

Internal Value (IV, double) = Convert bit or specified format

= slope * IV + offset

= f(x)

= Final internal value

This internal value is then used in the output map, going through a format conversion for storage (and

optionally slope/offset/special transformation). This internal value is also used for MQTT.

Poll and Value Setup

For Coils/Discretes:

For Holding/Input (in Poll P2):

The Function, Address, and Count fields define the Modbus poll. Each value in the poll must have a

Register that is contained in the result of that poll.

The error registers can be set to -1 to disable, or to any valid Modbus register (0-65534). If there’s a

conflict between error registers and output values, the error register will be written briefly, then the

output value. Errors on this Poll will set (1) the poll error registers and the parent device error registers,

and if the Poll is successful the error registers be cleared (0).

Coils/Discretes do not have a format specification, Holding/Inputs do have a format specification.

Formats of Bit, UInt16, Int16, Int32, UInt32, and Float32 are all available. For each of the 32bit values, all

four combinations of word and byte order are available.

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