Sofar I have gathered a lot of info and diagnosed the following CANid packets sent automagically by the BMS:
0x1DB, contains amps and volts and some status bits
0x1DC, contains capacity in kW and possibly some charging info
0x55B, contains SOC and some other pack voltage
0x5B9, GOMFuelbars
0x5BC, GIDS
0x5C0, some charging info ?
With the 0x79B/0x7BB challenge/response queries individual groups of data for cell voltages, temps and shunt bits can requested. Each group has their own index and response in several data frames:
0x01 pack health, 6 frames
0x02 cell voltages, 29 frames
0x03 voltages ? , 5 frames
0x04 temperatures, 3 frames
0x05 ?? 11 frames
0x06 shuntbits, 4 frames
Some findings:
Looking at the shunt bits it seems that the pack is balancing when power is applied to the BMS but without power to pin 21 IGN input.
When pulling the service plug or removing the main connector a bit is set in 0x1DB
Only when the service plug is present full pack voltage is present in 0x1DB. The individual cell voltages can always be read, even without the service plug plresent.
I assume this bit is also read bij other ECU's to decide what to display or start charge or alike.
Since i dont have access to an original charger i have connected a Brusa charger and will initiate a low current charge to see what happens when the shunt bits are set AND to discover if any other bits are set when shunting takes place. I assume that the charger is trickeled by the BMS when shunting takes place. Or maybe theres even a special CANid for it ?? Not sure if the BMS will 'tell' the charger how much current or voltage it can supply.
0x1DB, contains amps and volts and some status bits
0x1DC, contains capacity in kW and possibly some charging info
0x55B, contains SOC and some other pack voltage
0x5B9, GOMFuelbars
0x5BC, GIDS
0x5C0, some charging info ?
With the 0x79B/0x7BB challenge/response queries individual groups of data for cell voltages, temps and shunt bits can requested. Each group has their own index and response in several data frames:
0x01 pack health, 6 frames
0x02 cell voltages, 29 frames
0x03 voltages ? , 5 frames
0x04 temperatures, 3 frames
0x05 ?? 11 frames
0x06 shuntbits, 4 frames
Some findings:
Looking at the shunt bits it seems that the pack is balancing when power is applied to the BMS but without power to pin 21 IGN input.
When pulling the service plug or removing the main connector a bit is set in 0x1DB
Only when the service plug is present full pack voltage is present in 0x1DB. The individual cell voltages can always be read, even without the service plug plresent.
I assume this bit is also read bij other ECU's to decide what to display or start charge or alike.
Since i dont have access to an original charger i have connected a Brusa charger and will initiate a low current charge to see what happens when the shunt bits are set AND to discover if any other bits are set when shunting takes place. I assume that the charger is trickeled by the BMS when shunting takes place. Or maybe theres even a special CANid for it ?? Not sure if the BMS will 'tell' the charger how much current or voltage it can supply.
