siliXcon BMS Communication Protocol

This document overlaps with the our BMS1 application-level communications protocol and explains how the LYNX handles the incoming messages.

info

• All messages use little-endian format
• Documentation covers LYNX application-specific messages only
• Requires /bms/bmstype = 1 for siliXcon BMS support

Message Specifications

BMS Status (0x500)

Timeout: 1000ms

Byte	Type	Description
0	UINT_8	Not used by controller
1	UINT_8	BMS State: - < 90: Disarm - 90 (overvoltage): Disable braking
2	UINT_8	Error word (non-zero triggers disarm)
3	UINT_8	State of Charge: - 0-200: Maps to 0-100% - 255: Invalid (uses controller BEST)
4-5	UINT_16	Not used by controller
6	UINT_8	Battery discharge current limit 255 = no limitation
7	UINT_8	Battery charge current limit 0-255

tip

For BMS simulation:

• Messages 0x506 and 0x507 optional
• Requires non-zero /driver/limiter/ibpos and /driver/limiter/ibneg

BMS Limiter Settings (0x506)

• Applied only on first message
• Zero values maintain existing settings
• Not for dynamic current limiting

Byte	Type	Description
0-1	INT_16	Discharge current [A/10]
2-3	INT_16	Charge current [A/10]
4-5	INT_16	Min voltage [V/10]
6-7	INT_16	Max voltage [V/10]

BMS Current Settings (0x507)

• Applied only on first message
• Zero values maintain existing settings
• Sets maximum limits only
• No timeout
• Lower actual values take precedence

Byte	Type	Description
0-1	UINT_16	Iref/Irefr limit [A/10]
2-3	UINT_16	Ipeak limit [A/10]