Key Features

  • Combines an ANSI/CEA 709.3-1999 compliant free topology twisted pair transceiver with a Neuron 3120 or Neuron 3150 network processor core
  • Supports polarity insensitive free topology star, daisy chain, bus, loop, or mixed topology wiring
  • 78 kilobits per second bit rate for distances up to 500 meters in free topology or 2700 meters in bus topology with double terminations
  • High performance Neuron network processor core enables concurrent processing of application code and network packets (40MHz maximum for FT 3120 smart transceiver, 20MHz maximum for FT 3150 smart transceiver)
  • 4Kbytes of embedded EEPROM for application code and configuration data on the FT 3120 smart transceiver and 0.5Kbytes of embedded EEPROM for configuration data on the FT 3150 smart transceiver
  • Interface for external memory for devices with larger memory requirements (FT 3150 smart transceiver only)
  • 2Kbytes of embedded RAM for buffering network data and network variables
  • 11 I/O pins with 34 programmable standard I/O modes minimizing external interface circuitry
  • Unique 48-bit Neuron ID in every device for network installation

Tech Specs

Data Communications Type

Differential Manchester coding

Network Polarity

 Polarity insensitive

Isolation Between Network and

0-60Hz, 60 seconds 1000Vrms 0-60Hz, continuous 277Vrms[16]


Designed to comply with FCC Part 15 Level B and EN55022 Level B


Designed to comply with EN 61000-4-2, Level 4

Radiated Electromagnetic Susceptibility

Designed to comply with EN 61000-4-3, Level 3

Fast Transient/Burst Immunity

Designed to comply with EN 61000-4-4, Level 4

Surge Immunity

Designed to comply with EN 61000-4-5, Level 3

Conducted RF Immunity

Designed to comply with EN 61000-4-6, Level 3

Safety Approvals (FT-X1/FT-X2 Communication Transformer)

Recognized by UL to Standards UL 60950, 2000 and CSA C22.2 No. 60950, 2000 Recognized by TÜV EN 60950

Transmission Speed

78 kilobits per second

Numberof Transceivers Per Segment

Up to 64

Network Wiring

24 to 16AWG twisted pair; see User’s Guide or Junction Box and Wiring

Guidelines application note forqualified cable type

Network Length in Free Topology[17]

1000m (3,280 feet) maximum total wire with one repeater

500m (1,640 feet) maximum total wire with no repeaters

500m (1,640 feet) maximum device-to-device distance

Network Length in Doubly


Bus Topology[17]

5400m (17,710 feet) with one repeater

2700m (8,850 feet) with no repeaters

Operating Temperature

-40 to 85°C[3]

Operating Humidity

25-90% RH @50°C, non-condensing

Non-operating Humidity

95% RH @ 50°C, non-condensing


1.5g peak-to-peak, 8Hz-2kHz

FT 3120 and FT 3150 Free Topology Smart Tranceivers Datasheet



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