Cambium Networks cnReach N500 Handleiding (253 Pagina's)

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cnReach N500 User Guide System Configuration

phn-4980_001v004 August 2019)

2-65

Slope and Offset are both treated as floats, and must be valid float values. The defaults are slope=1,

offset=0, thus having no affect on the value.

Special is the arbitrary math function that can be applied to the value. If it is not used, ensure that it is

empty, no spaces or other characters. To use it, put a function of the form y=”f(x)”, where the quoted

part is entered into the box. Examples are “!x”, to invert the incoming data, “123*x+456”, a slope/offset

calculation, etc. A slope/offset calculation is valid, but is not reversible if entered here, as opposed to

the defined slope/offset are properly reversed on a write. The letter “x”, lower case, is the input to the

function. This supports addition (+), subtraction/negation (-), multiplication (*), division (/),

exponentiation (^) and modulus (%) with the normal operator precedence, abs, acos, asin, atan, atan2,

ceil, cos, cosh, exp, floor, ln, log, log10, pow, sin, sinh, sqrt, tan, tanh, fac, ncr, npr, with constants e and

pi available. Constants can be integers, decimal numbers, or in scientific notation (e.g. 1e3 for 1000).

IMPORTANT: If this value will be written, ie a Modbus Master will write to the data concentrator output

map, and the data concentrator will write through to the defined device/poll/register, then the special

function must be reversible, or not used. “!x” is reversible (for bit like numbers), in that !1 = 0, and !0 =

1. Most other arbitrary math is not reversible.

Output Value Setup

The output map defines a register, then a source which is a tag name comprised of the

Device.Poll.Value. The advanced button hides another slope/offset/special set of data manipulations

that can be used. This set of slope/offset/special is only applied to the Modbus output registers, not

MQTT values.

Coil/Discrete:

Holding/Inputs:

Note:

• All Modbus registers are in protocol address (0-65534), not PLC address (1..., 10,001…, 30,001…,

40,001…)

• Writing only supports (0x05) Write single coil, (0x06) Write single holding register, and (0x10)

Write multiple holding registers.

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