A "reverse engineering" of the Pytes CAN protocol when used with Victron/Venus OS. Inspired by https://github.com/dfch/BydCanProtocol
The following information has been discovered between a Pytes V5α and a Victron Venus OS v3.34.
- CAN protocol is set to 500kBit/s (no FD).
- All information has been dumped on a Raspberry 4 with Venus OS v3.34 (as written above) and a waveshare RS485 CAN HAT with
cansniffer -c -t 0 can0. - To test if the protocol works as expected you can use
cansendon the Raspberry to send can messages to Venus OS. You need to send all messages, and do that in a loop, otherwise Venus OS does not show any information about the battery after some seconds. - Another user posted can messages from his Pytes E-Box 4850-C here: hoylabs/OpenDTU-OnBattery#541 (reply in thread)
| Id | Hex | Ascii | Description |
|---|---|---|---|
| 351 | 38 02 E8 03 E8 03 C7 01 | 8....... | Dvcc: CVL, CCL, DCL, DVL |
| [00:01] "38 02" (V/10, DeciVolt) 56.8V CVL | |||
| [02:03] "E8 03" (A/10, DeciAmp) 100.0A CCL | |||
| [04:05] "E8 03" (A/10, DeciAmp) 100.0A DCL | |||
| [06:07] "C7 01" (V/10, DeciVolt) 45.5V DVL | |||
| 355 | 33 00 64 00 | 3.d. | StateInfo: State of Charge, State of Health |
| [00:01] "33 00" (%) 51% SoC | |||
| [02:03] "64 00" (%) 100% SoH | |||
| 356 | 8E 14 F9 FF B4 00 | ...... | BatteryStats: Voltage, Amps, Temperature |
| [00:01] "BE 14" (mV, MilliVolt) 52.62V current voltage | |||
| [02:03] "F9 FF" (A/10, DeciAmp, signed) -0.7A consumed Amps; "-" discharge / "+" charge | |||
| [04:05] "B4 00" (°C/10, Deci, signed) 18.0°C battery temperature | |||
| 35A | 00 00 00 00 00 00 00 00 | ........ | Alarms and Warnings, bit field, '0' means OK |
| 1. .. .. .. .. .. .. .. | ........ | [00,0] "1" Low battery voltage: Alarm | |
| 4. .. .. .. .. .. .. .. | ........ | [00,0] "4" High temperature: Alarm | |
| .4 .. .. .. .. .. .. .. | ........ | [00,1] "4" High battery voltage : Alarm | |
| .. 1. .. .. .. .. .. .. | ........ | [01,0] "1" Low charge temperature: Alarm | |
| .. 4. .. .. .. .. .. .. | ........ | [01,0] "4" High discharge current: Alarm | |
| .. .1 .. .. .. .. .. .. | ........ | [01,1] "1" Low temperature: Alarm | |
| .. .4 .. .. .. .. .. .. | ........ | [01,1] "4" High charge temperature: Alarm | |
| .. .. 4. .. .. .. .. .. | ........ | [02,0] "4" Internal failure: Alarm | |
| .. .. .1 .. .. .. .. .. | ........ | [02,1] "1" High charge current: Alarm | |
| .. .. .. .1 .. .. .. .. | ........ | [03,1] "01" Cell imbalance: Alarm | |
| .. .. .. .. 1. .. .. .. | ........ | [04,0] "1" Low battery voltage: Warning | |
| .. .. .. .. 4. .. .. .. | ........ | [04,0] "4" High temperature: Warning | |
| .. .. .. .. .4 .. .. .. | ........ | [04,1] "4" High battery voltage : Warning | |
| .. .. .. .. .. 1. .. .. | ........ | [05,0] "1" Low charge temperature: Warning | |
| .. .. .. .. .. 4. .. .. | ........ | [05,0] "4" High discharge current: Warning | |
| .. .. .. .. .. .1 .. .. | ........ | [05,1] "1" Low temperature: Warning | |
| .. .. .. .. .. .4 .. .. | ........ | [05,1] "4" High charge temperature: Warning | |
| .. .. .. .. .. .. 4. .. | ........ | [06,0] "4" Internal failure: Warning | |
| .. .. .. .. .. .. .1 .. | ........ | [06,1] "1" High charge current: Warning | |
| .. .. .. .. .. .. .. .1 | ........ | [07,1] "1" Cell imbalance: Warning | |
| 35E | 50 59 54 45 53 | PYTES | ManufacturerInfo |
| [00:04] "50 59 54 45 53" (string) "PYTES" manufacturer identification | |||
| 35F | 01 00 6E 01 32 00 | ..n.2. | BatteryInfo: Firmware version, Ah available |
| [00:01] "01 00" (v'01'.'00') maybe v01.00 hardware version | |||
| [02:03] "6E 01" (v'6E'.'01') v110.01 firmware version | |||
| [04:05] "32 00" (Ah) 50Ah capacity available | |||
| 360 | 00 | ........ | ??? always null |
| 372 | 02 00 01 00 01 00 02 00 | ........ | BankInfo |
| [00:01] "02 00" 2 batteries online | |||
| [02:03] "01 00" 1 batteries block charge | |||
| [04:05] "00 00" 1 batteries block discharge | |||
| [06:07] "02 00" 2 batteries offline | |||
| 373 | D8 0C DA 0C 21 01 23 01 | ....#.#. | CellInfo: Cell Voltage and Temperature |
| [00:01] "D8 0C" (mV) 3.288V Lowest Cell Voltage, see 374 | |||
| [02:03] "DA 0C" (mV) 3.290V Highest Cell Voltage, see 375 | |||
| [04:05] "21 01" (Kelvin) 289K, 16°C Minimum Cell Temperature, see 376 | |||
| [06:07] "23 01" (Kelvin) 291K, 18°C Maximum Cell Temperature, see 377 | |||
| 374 | 30 38 30 30 00 00 00 00 | 0800.... | Battery/Cell name (string) "0800 "with "Lowest Cell Voltage", see 373 |
| 375 | 30 34 30 30 00 00 00 00 | 0400.... | Battery/Cell name (string) "0400" with "Highest Cell Voltage", see 373 |
| 376 | 30 32 30 30 00 00 00 00 | 0000.... | Battery/Cell name (string) "0200" with "Minimum Cell Temperature", see 373 |
| 377 | 30 33 30 30 00 00 00 00 | 0000.... | Battery/Cell name (string) "0300" with "Maximum Cell Temperature", see 373 |
| 378 | 40 08 00 00 2B 07 00 00 | @...2... | History: Charged / Discharged Energy |
| [00:03] "40 08 00 00" (kWh/10, HectoWattHour) 211.2kWh Charged Energy | |||
| [04:07] "2B 07 00 00" (kWh/10, HectoWattHour) 183.5kWh Discharged Energy | |||
| 379 | 64 00 | d. | BatterySize: Installed Ah |
| [00:01] "64 00" (Ah) 100Ah | |||
| 380 | XX XX XX XX XX XX XX XX | redacted | Serial number - part 1 (string) |
| 381 | XX XX XX XX XX XX XX XX | redacted | Serial number - part 2 (string) |
