SIO03 Detailed Description

Lyve Tracelet


  • Seamless positioning from various sensor sources; < 1m accuracy
  • UWB receiver IEEE 802.15.4-2015;
  • GNSS/RTK multiband GNSS receiver
  • Inertial Measurement Unit (IMU)
  • Speed Pulse Signal according to IEC 16844-2
  • 100MBit/s Ethernet, PoE PD class 1
  • Alt. power input 9…36V DC (12/24V nom.); Ignition
  • USB service interface
  • Monitoring and remote maintenance (e.g. OTA update of firmware)
  • Designed for use in Rail (EN 50155) and Buses (E-Mark)


The UWB/RTK precise positioning module SIO03 is a member of the KYT Sensor family by Ci4Rail and can work as a standalone device as well as in combination with ModuCop MEC0x.

For highly precise positioning in public transport and rail car depots, stations, tunnels etc. or even indoor, a single sensor source is not sufficient. To provide precise localization, SIO03 combines the technologies UWB (ultra wide band), GNSS/RTK (Real-Time-Kinematik) and additional speed pulse input signal.

Whereas UWB works indoors using a cost sensitive satlet infrastructure, the GNSS/RTK technology provides high precision positioning information without additional infrastructure outdoors. The speed pulse input signal supports identification of distance traveled and movement direction. Specific movement models within an IMU (Inertial Measurement Unit) allow smooth seamless real-time positioning.

The positioning information is transferred to in-vehicle subsystems via Ethernet interface. The SIO03 product represents the vehicle component and does not cover stationary equipment like UWB satlets.

Detailed Technical Specification

Feature Value    
Communication Interface 100MBit/s Ethernet via M12 D-Coded    
Service Interface USB 2.0 via M12 8p A-Coded    
Positioning Indoor UWB IEEE 802.15.4-2015    
Positioning Outdoor Multi-band GNSS/RTK    
  GPS/QZSS (L1C/A L2C)    
  Galileo (E1B/C E5b)    
  BeiDou (B1I B2I)    
Position accuracy localization values have an accuracy of < 1m for 95% of the reported values    
Speed Pulse Signal acc. to IEC 16844-2 (input high: 4,8V; input low: 2,2V)    
Ignition On State: Input high: 5,2 V (min) or open    
  Standby State (after delay ~3 sec): Input low: 3,6 V (max)    
Firmware update Via USB, LAN    
Management Via io4edge protocol, see io4edge protocol    
Power Supply Power-over-Ethernet (PoE PD) class 1    
  12V, 24V (nom.) acc. to ISO 7637-2:2011 via M12 8p A-Coded    
Power Consumption Operation typ. < 3 W    
  Standby State < 0,1 W    
Dimensions (w/o mounting acc) Width: 110.0 mm    
  Depth: 98.0 mm    
  Height: 48.0 mm    
Mounting Flexible Mounting via integrated mounting holes or vehicle specific mounting adapter    
  Horizontal mounting on vehicle roof with connector in backwards or CAB B direction    
Ingress Protection IP66K    
Operating -40…+70°C (EN 50155:2021 - OT4)    
Storage Temperature -40…+85°C    
Humidity 95% (EN 50155-1:2021)    
Altitude 3000 m max. above sea level (EN 50125-1:2014, class AX)    
Shock / Vibration EN 61373:2010; Cat. 1; Class B    
EMC Emission / Immunity EN 50121-3-2:2016; EMV 06 Class S1 / ECE R10 Rev.6    
Safety EN 50155:2017; EN 50153:2014+A1:2017; EN 50124-1:2017; EN 62368-1:2016; EN ISO 13732-1:2008    
Fire & Smoke EN 45545-2:2013 + A1:2015; HL3    
Useful Life 20 years (EN 50155:2017, class L4)    
Certifications CE / UN ECE R10 (E-Mark)    


SIO03 provides two M12 interface connectors for roboust and IP protected connections. The product offers an M12-8pin A-coded connector for shared power and service interfaces as well as an M12-4pin D-coded Ethernet interface connector.

M12-8pin A-coded, socket:

  • alt. power supply 12V / 24V DC (nom)
  • Ignition
  • Wheeltick Input
  • USB-Service Interface

Mating connector: M12 8-pin A-coded, plug.

Lyve Tracelet

Pin Symbol Description
1 V_IN 12/24V Power Supply Input
2 WT Wheeltic input
3 IGN Ignition
4 USB- USB Dataline -
5 GND Ground
6 GND Ground
7 V_USB USB Power Supply Input
8 USB+ USB Dataline +

M12-4pin D-coded, socket:

  • 100 MBit/s Ethernet; Power Over Ethernet

Mating connector: M12 4-pin DA-coded, plug.

Lyve Tracelet

Pin Symbol Description
1 TxD+ CT (PoE)
2 RxD+ CT (PoE)
3 TxD- CR (PoE)
4 RxD- CR (PoE)

Mechanical Outline

The Tracelet has the following dimensions

Dimension Value
Length 110 mm
Depth 98 mm
Height 48 mm

Lyve Tracelet

Mounting & Installation

The tracelets have to be mounted with clear view to GNSS satellites as well as UWB satlet infrastructure. We recommend mounting on roof of vehicle.

Mounting depends on the given conditions per vehicle. Depending on the mounting conditions, specific mounting brackets might be available. Contact Ci4Rail for specific designs of mounting brackets

Lyve Tracelet

(Picture shows SIO02 but is also valid for SIO03 - mounting is identical)

In some cases, a snow cover might be useful.

Lyve Tracelet

The tracelets have to be mounted in specific orientation to give the best results in positioning. Mounting is done by M5 mounting bolts, lock washers and nuts as shown in the following picture:

Lyve Tracelet Lyve Tracelet

(Pictures shows SIO02 but is also valid for SIO03 - mounting is identical)

Installation Requirements

Due to integrated inertial measurement unit (IMU), the mounting orientation is essential. The Tracelet has to be mounted with an angle of 0° to ground The Tracelet has to be oriented with the M12 connector towards vehicle back (Cab B).

Lyve Tracelet

(Picture shows SIO02 but is also valid for SIO03 - mounting is identical)