esera automation 11134 V2 Manuale d'uso - Pagina 5

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Art. No. 11134 V2

Manual calculation of the sensor values

The following formula can be used to evaluate the humidity sensor.

VDD = operating voltage (5V), VAD = humidity sensor, analog value of the DS2438, Xsense = light sensor,

analog value of the DS2438.

Humidity calculation

Offset = 0.847847 (Zero Offset V), slope = 29.404604 (Slope: mV/ %RH)

Srh = (VAD_new - offset) / (slope / 1000)

rFH = (Srh + 2)/ ((1.0305 + (0.000044 * Temperature) - (0.0000011 * Temperature x 10²)))))

for Loxone control:

I1 = VAD-Value, I3 = Temperature

((((5/I2*I1)-0,847847)/(29,404604/1000))+2)/((1,0305+(0,000044*I3)-(0,0000011*I3^2)))

Brightness calculation

Xsense in Volt, factor = 25600

correction for operating voltage fluctuations: Xsense = (5 / VDD) * Xsense

brightness (LUX) = (0,223V – Xsense) * factor

Note on brightness measurement

It should be noted that due to the placement of light sources in relation to the angle of incidence of the

Multisensor, there may be considerable deviations in the measured brightness values compared to hand-held

brightness meters. This is not a fault of the Multisensor.

In the case of lighting with fluorescent or LED lamps, the value may also fluctuate. A living room brightness

control is usually affected by strongly changing light conditions, e.g. by shadows of people in the room and

the resulting fluctuations of the sensor light values, and a well-functioning control function is often difficult to

implement. The reason for this is largely the unfavorable placement in the light switch area for the brightness

measurement of the Multisensor.

1-Wire Network, Cabling

The special feature of the 1-Wire system is the "BUS technology". All devices (sensors and actuators) are

operated in parallel on a three-wire line, which is used for both power supply and data communication. The

1-Wire Bus system joins the list of other successful bus systems such as CAN or Modbus RTU. All of the

installation principles recommended for these are also applicable and appropriate to 1-Wire.

The maximum size of a 1-Wire Network is determined by various factors. These are mainly:

Total cable length and cable type

Number of 1-Wire devices

Type of cable installation (topology)

Number and design of cable connectors (unnecessary connection transitions should be avoided)

All factors in total are summarised and designated as 1-Wire Bus load. Each increase in a factor increases the

total 1-Wire Bus load for the 1-Wire Controller and thus reduces the maximum network size.

According to our many years of experience and a lot of feedback from customers, the following conservative

recommendation can be made:

Maximum cable length 50 -120m

Number of 1-Wire devices no more than 20 -22 pieces

As linear a topology as possible without T-junctions

The topology in particular plays a major role. If possible, it should be installed in a linear topology. The linear

topology can be compared like pearls on a pearl necklace. The data line should be laid from one device to the

next without T-joints.

Furthermore, the type of cable used can also be mentioned here. We recommend for the cabling

CAT5 or CAT6 network cable. It is also possible to use J-Y(St)Y telephone cables and KNX cables. Longer

cable runs are possible with CAT5 versus CAT7 cables.

With twisted pair cables, a longer connection length can be achieved in an undisturbed environment, as the

capacitive Bus load is lower. A total length of 50 m and more can be easily achieved without additional

measures.

ESERA GmbH. Errors and technical modification subject to change. ESERA GmbH 2021

www.esera.de

11134-V2 V1.0 R1.0 Manual

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