Next Level Racing HF8 Protocol

Introduction

The Next Level Racing HF8 Haptic Gaming Pad is a USB serial device with 8 vibration motors positioned across the seat surface. It is not a Bluetooth device.

Transport

• Interface: USB Serial (CDC)
• Baud rate: 115200
• Data bits: 8
• Parity: None
• Stop bits: 1.5
• Handshake: None
• Line ending: \r (carriage return)
• Read timeout: 1 ms
• Write timeout: 50 ms
• Write buffer size: 64 bytes

Commands

Query State

P\r

Response format:

E<IntensityScale>,A<AudioMode>

Where:

• IntensityScale = 0–255
• AudioMode = 0 (off) or 1 (on)

Set Motor Intensity

M<Motor><Intensity>\r

Where:

• Motor = 0–7
• Intensity = 0–255

Motor Layout

Motor	Position
M0	Right thigh
M1	Left thigh
M2	Right buttock
M3	Left buttock
M4	Right back
M5	Left back
M6	Right shoulder
M7	Left shoulder

Sources

• GitHub Issue (docs.buttplug.io#36)
• Buttplug implementation (nextlevelracing.rs)