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InnoTek FieldPro Protocol

Introduction​

The InnoTek FieldPro is a dog training e-collar that communicates via 27.145 MHz FM FSK radio with forward error correction. It is not a Bluetooth device. Transmission requires precise timing with no jitter; a Si5351 clock chip with dual PLLs is used to generate the carrier frequencies for 0 and 1 bits.

This is a general-purpose RF e-stim device documented for completeness.

RF Specification​

  • Frequency: 27.145 MHz FM FSK
  • Forward error correction: yes
  • Jitter tolerance: very low — requires hardware clock switching (e.g., Si5351)

Packet Format​

Packets are sent twice (two identical copies). Each packet contains:

  • Preamble (14 ms)
  • Device ID field
  • Command field
  • Error correction bytes
  • Balancing bytes
  • Spacer / trailer
// Example packet (bit array, two copies):
preamble: 0,1,0,1,0,1,0,1,0,1,0,1,0,1,1,0,0,0,1,1,1
// ID:       1,1,0,1,0,1,0,1,1,1,1,0,0,1,0,0,0,0,0
// command:  0,1,1,0,0,0,0,0,1,0,0,1,1,1,0,1,1,1,1
// ecc+bal:  0,1,0,0,1,1,1,0,0,1,1,0,0,0,0
// spacer:   0,0,0,0,0,0,0,0,1

Full packet (C array):

byte packet[] = {
  // Packet 1
  0,1,0,1,0,1,0,1,0,1,0,1,0,1,1,0,0,0,1,1,1,  // preamble (14ms)
  1,1,0,1,0,1,0,1,1,1,1,0,0,1,0,0,0,0,0,        // ID + ecc
  0,1,1,0,0,0,0,0,1,0,0,1,1,1,0,1,1,1,1,        // command + ecc + bal
  0,1,0,0,1,1,1,0,0,1,1,0,0,0,0,                // command + ecc + bal
  0,0,0,0,0,0,0,0,1,                             // spacer
  // Packet 2 (identical)
  0,1,0,1,0,1,0,1,0,1,0,1,0,1,1,0,0,1,1,1,
  1,1,0,1,0,1,0,1,1,1,1,0,0,1,0,0,0,0,0,
  0,1,1,0,0,0,0,0,1,0,0,1,1,1,0,1,1,1,1,
  0,1,0,0,1,1,1,0,0,1,1,0,0,0,0,
  0,0,0,0,0,0,0,0
};

Notes​

  • This is a dog training collar, not an adult device, but is documented as a controllable e-stim device.
  • Full ID and command bit field encoding is not documented beyond the packet example.

Sources​