The Ermetris Intelligent Railway Handset has been developed and manufactured with the aim to create a device that meets the demanding standards required in the railway field.  Low profile: the handset’s reduced depth facilitates its assembling within electrical wall cabinets with doors.

Magnetic fastening to the cradle: the lack of release buttons allows the handset to be easily used also without specific instructions or prior knowledge and experience.  Rugged and easy to install: the handset is built with robust materials and all parts are secured with screws. The cradle does not need to be disassembled to be fastened to the supporting panel.
Excellent sound quality: the transducers and their position within the handset have been carefully selected in order to obtain maximum audio performance.
Various options available: it is not one single product but a range of products. In fact, the handset can be customised according to different needs and it can be equipped with either a dynamic or electret microphone, with different types of connectors, and with a speaker in the cradle. Moreover, versions of the handset equipped with mic preamplifier, noise reduction circuit and Ethernet interface are being planned.

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SKU: 012 Category: Tag:


Technical specification


General features

  • PIC32 microcontroller inside
  • Insulated RS485 communication with on board computer or MMI (custom protocol )
  • Audio In
  • Audio Out
  • Hidden microphone in the cradle
  • 4-to-2 wire converter on audio input/output channel
  • Display LCD 12 characters x 2 lines
  • Keyboard 15 keys Silicone rubber
  • Operating temperature: T3 class of EN 50155 (-25° to 70°C)
  • Dimensions with cradle: 63 (W) x 202 (H) x 90 (D) mm
  • Fastening holes : 4,2 mm
  • Distance between fastening holes: 60 mm
  • Weight : 400 g

Microphone (electret condenser)

  • Sensitivity: -46 dB (± 3 dB) at 1kHz, 0dB=1V/Pa
  • Frequency response: 100 Hz to 10 kHz
  • Directivity: noise cancelling
  • Operating voltage: 2 V (max. 10 V)
  • Impedance: 2.2 kΩ at 1 kHz

Earphone (dynamic)

  • Efficiency: 100 dB at 1 kHz (± 2 dB)
  • Frequency response: 200 Hz ÷ 5 kHz
  • Impedance: 300 ohm (± 15%) at 1 kHz

PTT switch

  • Current: 100 mA max
  • Contact resistance: < 1 ohm
  • Electrical life: > 100.000 cycles
  • Activation pressure: 240 g
  • Pushbutton colour: RAL 2008

Hook switch

  • Reed-switch with change-over contact
  • Voltage: 100 Vdc max
  • Current: 0.3 A max


  • EN50155, EN60068, EN61373, EN60950, UNI CEI 11170, EN45545