# XBT006 1-Wire Interface for 4-Wire RTD PT100
XBT006 interface is used to connect PT100 temperature sensor. It converts the PT100 resistance into a digital value that is transmitted using 1-Wire interface to 1-Wire master.
XBT006 1-Wire Interface for 4-Wire RTD PT100
It has 2 sockets for 1-Wire interface and one for connection to a 4 wire Pt100 sensor.
All the sockets are the same 4 pin, 3.50 mm pitch terminal block type.
Use 4 pin, 3.50 mm pitch terminal block plug for all the sockets.
Push or pull the plug to connect or disconnect it.
It is recommended to crimp adequate bootlace ferrules on all the sensor wires to obtain a good quality of connection.
## **1-Wire sockets**
The XBT006 1-Wire sockets are marked “1-WIRE/PWR”.
Their 4 pins has the following markings and functions:
| Marking | Signal |
| ------- | ---------------- |
| OW | 1-Wire data |
| GND | Power ground |
| GND | Power ground |
| PWR | Power supply +5V |
The corresponding OW (1-Wire), GND and PWR (+5V) pins of two 1-Wire sockets are connected internally inside the module to enable pass-through connection if it is needed to connect another sensor or interface using the same cable as described in [1-Wire interface](/bbo-gateway-installation-manual/bbo-gateways/1-wire-interface.md).
The interface is offered with a cable with RJ12 plug on one side and separate wires on the other end. The cable length shall be adjusted depending on the installation requirements.
RJ12 plug is connected to XBB006 gateway. The wires on the other side are connected to a terminal block plug and then to one of the 1-wire inputs.
## **PT100 socket**
PT100 socket pins are marked -2, -1, +1 and +2.
The PT100 sensor wires shall be screwed tight to the connector to minimize the connection resistance. The 2 pairs of wires from two sides of 4 wire PT100 sensor shall be connected to left and right pairs of pins of the sensor connector respectively.
**The interface is designed to work with 4 wire PT100 sensors. If 2 or 3 wire types are used, then not used connector pin must be shorted with its pair but the wires resistance will introduce measurement error which cannot be compensated.**
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