Lithionics BMS Communication

Info PDF

Message	PGN	PGN	Notes
REQUEST	0xEA##	59904	isoRequest. BMS listens and responds to these messages
ADDRESS_CLAIM	0xEE##	60928	BMS will claim preset SA=0x45, but can be changed in config.
DM_RV	0x1FECA		Diagnostic data as defined in RV-C specs
PRODUCT_ID	0xFEEB	65259	Single frame ID string = LI3*8**
DC_SOURCE_STATUS_1	0x1FFFD	131069	Battery Voltage and Current data
DC_SOURCE_STATUS_2	0x1FFFC	131068	Battery Temperature and SOC data
DC_SOURCE_STATUS_3	0x1FFFB	131067	provides remaining Ah capacity
DC_SOURCE_STATUS_4	0x1FEC9		provides desired charger state and charge specs
DC_SOURCE_STATUS_6	0x1FEC7		provides HVC and LVC status
DC_SOURCE_STATUS_11	0x1FEA5		provides more status bits, total Ah capacity and current Power
DC_SOURCE_COMMAND	0x1FEA4		accepts ON/OFF/Charge-ON commands
PROP_LITHIONICS_COMMAND	0xEF45		accepts request for proprietary status data
PROP_LITHIONICS_STATUS	0xEF##		provides proprietary status bits and other data

RV-C values are little endian.

rvcDcSourceStatus1 0x1FFFD 131069 (8 bytes)

This message provides battery Voltage and Current data. Message is sent every 1 second.

Byte	Name	Data Type	Default	Value Definition
0	Instance	uint8	1	Battery instance or BAT_ID. Change in BMS config to allow multiple BMS systems on same bus.
1	Device Priority	uint8	120	Device type as BMS, see RV- C specs for details
2-3	Battery Voltage	uint16	13.8v	Precision = 0.05V Example – 0x010E = 13.5V
4-7	Battery Current	uint32	0	Amps of Discharge Current. Positive value = discharge - Negative value = charge

Example

Instance	Priority	Volts	Amps Used
01	78	0x1401	0x00943577
1	120	276	2000000000
-	-	* 0.05	-2000000000, * 0.001
1	120	13.8	0

rvcDcSourceStatus2 0x1FFFC 131068 (7 bytes)

Byte	Name	Data Type	Default	Value Definition
0	Instance	uint8	1	Battery instance or BAT_ID. Change in BMS config to allow multiple BMS systems on same bus.
1	Device Priority	uint8	120	Device type as BMS, see RV- C specs for details
2-3	Battery Temp	uint16	0	Precision = 0.003125 °C Offset – 0 °C = 0x2220 (8736) Example – 0x2540 (9536) = 25 °C
4	State of charge	uint 8	198	Precision = 0.5% Example – 0xC8 = 100%
5-6	Time Remaining	uint16	0	Remaining Discharge Time

Example

Instance	Priority	Temp	SOC	Time Minutes
01	78	0x8024	C6	0x64F1
1	120	9344	198	61796
-	-	-8736, (608) * 0.003125	* 0.5
1	-	1.9	99	30898 21.4 days

rvcDcSourceStatus3 0x1FFFB 131067 (6 bytes)

Byte	Name	Data Type	Default	Unit	Value Definition
0	Instance	uint8	1		Battery instance or BAT_ID. Change in BMS config to allow multiple BMS systems on same bus.
1	Device Priority	uint8	120		Device type as BMS, see RV- C specs for details
2	State of Health	uint8	100	%	Precision = 0.5%. always set to 100%
3-4	Remaining Discharge Capacity	uint16	Ah	Ah	Precision = 1Ah Example – 0x015E = 350Ah
5	Remaining Relative Capacity	uint8		%	Same as State of Charge data. Precision = 0.5%

Example

Instance	Priority	Health %	Ah	SOC
01	78	C8	5702	C6
1	120	200	599	198
		* 0.5		* 0.5
		100	599	99