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Sportdog SD-400 Collar

Introduction​

The Sportdog Fieldtrainer 400 (SD-400) is a shock collar with momentary stimulation, continuous stimulation, and tone capabilities. The collar model number is FR-200, and the remote model number is FT-100.

This documentation should apply to any Sportdog training collar compatible with the FT-100 remote (including SD-400, SD-400S and SD-400CAMO).

Communication Protocol​

The SD-400 remote uses binary FSK (frequency-shift keying) to send commands to the collar.

The carrier frequency is 27.255 MHz (Citizens Band Channel 23).

This document uses the following symbol definitions:

  • '0': 0 Hz (unmodulated), 4 ms duration
  • '1': 5 kHz modulation, 4 ms duration
  • '2': 5 kHz modulation, 2 ms duration

The 2ms '2' symbol only appears to demarcate repeating portions of a continuous command. All data symbols are either '0' or '1'.

Commands​

There are two classes of commands sent by the remote:

  1. Momentary: Used for the momentary stimulation (nick) function.
  2. Continuous: Used for continuous stimulation and tone function.

Momentary Commands​

"Momentary" commands sent by the remote are 43-bits long (172 ms).

Format:
  1 1111 0001 [16-bit remote ID] [8-bit command type] [8-bit command arg] 10

Continuous Commands​

"Continuous" commands have a similar structure to the momentary commands, but the transmission sequence repeats for as long as the button is held.

Start:
  1 1111 0001 [16-bit remote ID] [8-bit command type] [8-bit command arg] 102
Repeated N times:
         0001 [16-bit remote ID] [8-bit command type] [8-bit command arg] 102
End:
         0001 [16-bit remote ID] [8-bit command type] [8-bit command arg] 1021111111111

Other Info​

For both momentary and continuous commands, if the remote is in "standby-mode" (no buttons pressed for some time), then the initial sequence of 5 '1's (20ms), becomes 23.5 bits long instead (94ms). However, the collar doesn't seem to require this.

The FT-100 has an 8-position dial, and 3 buttons (up, down, side). In the default Mode 1, these buttons have the following functions:

  • Up: Continuous shock at the specified level for up to 8 seconds.
  • Down: Nick at the specified level.
  • Side: Beep.

At this time, only the Mode 1 commands have been documented. The other modes provide additional functionality, such as exposing 16 levels of continuous stimulation.

Remote IDs​

Example remote IDs: 0x6695, 0x999a

The remote is TX-only and the collar is RX-only. A remote has a fixed ID that it broadcasts. A collar will pair to a remote, and will only listen to its paired remote's ID. To pair a collar to a real or emulated remote:

  1. Turn the collar off.
  2. Press and hold the collar power button until the collar LED turns off (4-5 seconds)
  3. Send the "continuous stimulation" or "beep" command from the remote until the collar LED blinks 5 times.

Command and Argument Values​

Command Type: Beep (0x59)​

  • Arg: 0xa9

Command Type: Nick (0x6a)​

  • Level 1: 0xa9
  • Level 2: 0xa6
  • Level 3: 0xa5
  • Level 4: 0x9a
  • Level 5: 0x99
  • Level 6: 0x95
  • Level 7: 0x6a
  • Level 8: 0x55

Command Type: Continuous (0x66)​

The arguments are the same as the Nick command.

  • Level 1: 0xa9
  • Level 2: 0xa6
  • Level 3: 0xa5
  • Level 4: 0x9a
  • Level 5: 0x99
  • Level 6: 0x95
  • Level 7: 0x6a
  • Level 8: 0x55

Code​

See biribiribiri/sd400 for example code.