Difference between revisions of "CAN"
Line 66: | Line 66: | ||
! Byte !! Value || Unit | ! Byte !! Value || Unit | ||
|- | |- | ||
− | | 00, 01 || Battery Maximum Voltage || Volts * 10<br/>Observed 71.4V even during charging on original 70.5V charger | + | | 00, 01 || Battery Maximum Voltage || Volts * 10<br/>Observed 71.4V even during charging on original 70.5V charger<br/>(This fits 4.2V * 17 cells in series) |
|- | |- | ||
| 02, 03 || Battery Maximum Charge Current || Amps * 10<br/>Observed 15A, 0A when charged | | 02, 03 || Battery Maximum Charge Current || Amps * 10<br/>Observed 15A, 0A when charged |
Revision as of 01:58, 11 January 2021
A standard automotive protocol, CAN operates on two wires as a differential signal. These are called CAN High and CAN Low. Both of these wires have some electric potential against common ground, but the ground is not involved in the connection as just the two wires are used. CAN is a bus where multiple devices are connected on the same physical line. The bus also has to be terminated by a resistor.
CPX
The CPX uses 250 000 bps CAN bus terminated by the scooter or the charger. This means if direct connection to the battery is required, the used CAN interface needs terminate the bus or a 120 Ohm resistor needs to be installed manually across the two pins.
Each message sent contains an ID that designates a type of the message, and 8 bytes of data.
Battery BMS
Following messages are provided by the battery BMS unit when in A/B mode or charging mode.
Message ID | Purpose |
---|---|
504 | Charging information |
506 | Battery state and charging information |
54E | Battery parameters and information |
Please note that many parameters repeat between different message IDs. If a value is indicated to be contained within multiple bytes, the byte order is Little Endian, meaning the higher the byte count, the higher the significance.
The Message IDs specified here apply when using the battery in A-mode or Charging mode. When using with B-mode, the IDs are +1 higher. Please see Battery connector#Gen 2 for modes description.
Byte | Value | Unit |
---|---|---|
00, 01 | Unknown | Speculation: discharge current? |
02, 03 | Battery Voltage | Volts * 10 |
04, 05 | Charging Current | Amps * 10 |
06 | Unknown | Only observed 0x00 |
07 | Unknown flag | 0x95 during charging, 0x00 otherwise |
Byte | Value | Unit |
---|---|---|
00 | Battery state bitmask | Bits from least sig.: 0 = charging mode 1 = voltage on pins 3 = initialized after connection |
01 | Battery state bitmask | Bits from least sig.: 0 = charging mode 4 = charging in progress |
02, 03 | Charging Current | Amps * 10 |
04, 05 | Voltage per cell (avg? max? min?) | Volts * 1000 |
06 | Unknown | Only observed 0x00 |
07 | Battery mode | 0x10 = charging mode, 0x20 = riding mode |
Byte | Value | Unit |
---|---|---|
00, 01 | Battery Maximum Voltage | Volts * 10 Observed 71.4V even during charging on original 70.5V charger (This fits 4.2V * 17 cells in series) |
02, 03 | Battery Maximum Charge Current | Amps * 10 Observed 15A, 0A when charged |
04 | State of Charge | Percents |
05, 06 | Battery Voltage | Volts * 10 |
07 | Unknown flag | 0x30 during charging, 0x00 otherwise |