Data Sheet

Attention

The device is classified as appliance class 1. That is why it is also necessary to connect protective

ground conductor to ground connector of the device marked on the case with symbol. For ground

conductor connection use cable eye and provided M4 screw.

Note

DIN rail with the installed device must be connected to protective ground conductor.

2.4.3 Communication line connection

2.4.3.1 RS-485

The RS-485 (EIA-485) serial line is made on screw connectors labeled as RS-485 (A and B). The

device features optionally joinable terminator 100 Ω resistor marked with END (RS-485-END, BUS-

END).

Note

For correct bus operation, it is necessary to connect terminator on both sides of the line.

2.4.3.2 1-Wire

Purpose of 1-Wire is passive data collection from connected sensors (e.g. thermometer, humidity

sensor). The connection is done via RJ45 connector marked as 1-Wire. Connection of more devices on

1-Wire bus is done via a hub (1-Wire 8 port hub, SKU number: 2014021).

Description of 1-Wire bus conductors in RJ45 jack.

Note

The ingoing conductor 7 is not used at bus master (because it is not needed) but must be used in all

sensors (hubs) on the bus in order to maintain functionality. The table above and illustration of RJ45

connector serves for illustration of correct device connection to the bus to ensure correct functionality of

the bus itself.

Note

1-Wire bus is implemented using six conductors, where two conductors are for data transmission (DQ),

two ground conductors (GND) and two as power supply conductors (Vcc). Two data conductors are

used to minimize the distance between sensor and the bus (bus serialization). That enhances bus

reliability and maximizes the number of sensors.

For reliable bus functioning, it is necessary to follow these instructions:

 Follow the presented connection schema of UTP cable.

 Make the distance between end device (sensor) and the input / output conductor as short as

possible.

 Do not connect more than 15 sensors to a single channel.

 For multiple HUB interconnection use shielded or foiled twisted pair cable (STP or FTP) and

connect the shielding to the ground conductor.

 Use 24 AWG cable with diameter 0,5 mm (e.g. Cat. 5e).

Conductor purpose

Conductor number

(+5V)

4, 5

Data (DQ) outgoing

Data (DQ) ingoing

GND

3, 8

Unused

1, 2