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pylontech.py
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pylontech.py
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from typing import Dict
import logging
import serial
import construct
logger = logging.getLogger(__name__)
class HexToByte(construct.Adapter):
def _decode(self, obj, context, path) -> bytes:
hexstr = ''.join([chr(x) for x in obj])
return bytes.fromhex(hexstr)
class JoinBytes(construct.Adapter):
def _decode(self, obj, context, path) -> bytes:
return ''.join([chr(x) for x in obj]).encode()
class DivideBy1000(construct.Adapter):
def _decode(self, obj, context, path) -> float:
return obj / 1000
class DivideBy100(construct.Adapter):
def _decode(self, obj, context, path) -> float:
return obj / 100
class DivideBy10(construct.Adapter):
def _decode(self, obj, context, path) -> float:
return obj / 10
class ToVolt(construct.Adapter):
def _decode(self, obj, context, path) -> float:
return obj / 1000
class ToAmp(construct.Adapter):
def _decode(self, obj, context, path) -> float:
return obj / 10
class ToCelsius(construct.Adapter):
def _decode(self, obj, context, path) -> float:
return (obj - 2731) / 10.0 # in Kelvin*10
class Pylontech:
manufacturer_info_fmt = construct.Struct(
"DeviceName" / JoinBytes(construct.Array(10, construct.Byte)),
"SoftwareVersion" / construct.Array(2, construct.Byte),
"ManufacturerName" / JoinBytes(construct.GreedyRange(construct.Byte)),
)
system_parameters_fmt = construct.Struct(
"CellHighVoltageLimit" / ToVolt(construct.Int16ub),
"CellLowVoltageLimit" / ToVolt(construct.Int16ub),
"CellUnderVoltageLimit" / ToVolt(construct.Int16sb),
"ChargeHighTemperatureLimit" / ToCelsius(construct.Int16sb),
"ChargeLowTemperatureLimit" / ToCelsius(construct.Int16sb),
"ChargeCurrentLimit" / DivideBy10(construct.Int16sb),
"ModuleHighVoltageLimit" / ToVolt(construct.Int16ub),
"ModuleLowVoltageLimit" / ToVolt(construct.Int16ub),
"ModuleUnderVoltageLimit" / ToVolt(construct.Int16ub),
"DischargeHighTemperatureLimit" / ToCelsius(construct.Int16sb),
"DischargeLowTemperatureLimit" / ToCelsius(construct.Int16sb),
"DischargeCurrentLimit" / DivideBy10(construct.Int16sb),
)
management_info_fmt = construct.Struct(
"ChargeVoltageLimit" / DivideBy1000(construct.Int16ub),
"DischargeVoltageLimit" / DivideBy1000(construct.Int16ub),
"ChargeCurrentLimit" / ToAmp(construct.Int16sb),
"DischargeCurrentLimit" / ToAmp(construct.Int16sb),
"status"
/ construct.BitStruct(
"ChargeEnable" / construct.Flag,
"DischargeEnable" / construct.Flag,
"ChargeImmediately2" / construct.Flag,
"ChargeImmediately1" / construct.Flag,
"FullChargeRequest" / construct.Flag,
"ShouldCharge"
/ construct.Computed(
lambda this: this.ChargeImmediately2
| this.ChargeImmediately1
| this.FullChargeRequest
),
"_padding" / construct.BitsInteger(3),
),
)
module_serial_number_fmt = construct.Struct(
"CommandValue" / construct.Byte,
"ModuleSerialNumber" / JoinBytes(construct.Array(16, construct.Byte)),
)
get_values_fmt = construct.Struct(
"NumberOfModules" / construct.Byte,
"Module" / construct.Array(construct.this.NumberOfModules, construct.Struct(
"NumberOfCells" / construct.Int8ub,
"CellVoltages" / construct.Array(construct.this.NumberOfCells, ToVolt(construct.Int16sb)),
"NumberOfTemperatures" / construct.Int8ub,
"AverageBMSTemperature" / ToCelsius(construct.Int16sb),
"GroupedCellsTemperatures" / construct.Array(construct.this.NumberOfTemperatures - 1, ToCelsius(construct.Int16sb)),
"Current" / ToAmp(construct.Int16sb),
"Voltage" / ToVolt(construct.Int16ub),
"Power" / construct.Computed(construct.this.Current * construct.this.Voltage),
"_RemainingCapacity1" / DivideBy1000(construct.Int16ub),
"_UserDefinedItems" / construct.Int8ub,
"_TotalCapacity1" / DivideBy1000(construct.Int16ub),
"CycleNumber" / construct.Int16ub,
"_OptionalFields" / construct.If(construct.this._UserDefinedItems > 2,
construct.Struct("RemainingCapacity2" / DivideBy1000(construct.Int24ub),
"TotalCapacity2" / DivideBy1000(construct.Int24ub))),
"RemainingCapacity" / construct.Computed(lambda this: this._OptionalFields.RemainingCapacity2 if this._UserDefinedItems > 2 else this._RemainingCapacity1),
"TotalCapacity" / construct.Computed(lambda this: this._OptionalFields.TotalCapacity2 if this._UserDefinedItems > 2 else this._TotalCapacity1),
)),
"TotalPower" / construct.Computed(lambda this: sum([x.Power for x in this.Module])),
"StateOfCharge" / construct.Computed(lambda this: sum([x.RemainingCapacity for x in this.Module]) / sum([x.TotalCapacity for x in this.Module])),
)
get_values_single_fmt = construct.Struct(
"NumberOfModule" / construct.Byte,
"NumberOfCells" / construct.Int8ub,
"CellVoltages" / construct.Array(construct.this.NumberOfCells, ToVolt(construct.Int16sb)),
"NumberOfTemperatures" / construct.Int8ub,
"AverageBMSTemperature" / ToCelsius(construct.Int16sb),
"GroupedCellsTemperatures" / construct.Array(construct.this.NumberOfTemperatures - 1, ToCelsius(construct.Int16sb)),
"Current" / ToAmp(construct.Int16sb),
"Voltage" / ToVolt(construct.Int16ub),
"Power" / construct.Computed(construct.this.Current * construct.this.Voltage),
"_RemainingCapacity1" / DivideBy1000(construct.Int16ub),
"_UserDefinedItems" / construct.Int8ub,
"_TotalCapacity1" / DivideBy1000(construct.Int16ub),
"CycleNumber" / construct.Int16ub,
"_OptionalFields" / construct.If(construct.this._UserDefinedItems > 2,
construct.Struct("RemainingCapacity2" / DivideBy1000(construct.Int24ub),
"TotalCapacity2" / DivideBy1000(construct.Int24ub))),
"RemainingCapacity" / construct.Computed(lambda this: this._OptionalFields.RemainingCapacity2 if this._UserDefinedItems > 2 else this._RemainingCapacity1),
"TotalCapacity" / construct.Computed(lambda this: this._OptionalFields.TotalCapacity2 if this._UserDefinedItems > 2 else this._TotalCapacity1),
"TotalPower" / construct.Computed(construct.this.Power),
"StateOfCharge" / construct.Computed(construct.this.RemainingCapacity / construct.this.TotalCapacity),
)
def __init__(self, serial_port='/dev/ttyUSB0', baudrate=115200):
self.s = serial.Serial(serial_port, baudrate, bytesize=8, parity=serial.PARITY_NONE, stopbits=1, timeout=2, exclusive=True)
@staticmethod
def get_frame_checksum(frame: bytes):
assert isinstance(frame, bytes)
sum = 0
for byte in frame:
sum += byte
sum = ~sum
sum %= 0x10000
sum += 1
return sum
@staticmethod
def get_info_length(info: bytes) -> int:
lenid = len(info)
if lenid == 0:
return 0
lenid_sum = (lenid & 0xf) + ((lenid >> 4) & 0xf) + ((lenid >> 8) & 0xf)
lenid_modulo = lenid_sum % 16
lenid_invert_plus_one = 0b1111 - lenid_modulo + 1
return (lenid_invert_plus_one << 12) + lenid
def send_cmd(self, address: int, cmd, info: bytes = b''):
raw_frame = self._encode_cmd(address, cmd, info)
self.s.write(raw_frame)
def _encode_cmd(self, address: int, cid2: int, info: bytes = b''):
cid1 = 0x46
info_length = Pylontech.get_info_length(info)
frame = "{:02X}{:02X}{:02X}{:02X}{:04X}".format(0x20, address, cid1, cid2, info_length).encode()
frame += info
frame_chksum = Pylontech.get_frame_checksum(frame)
whole_frame = (b"~" + frame + "{:04X}".format(frame_chksum).encode() + b"\r")
return whole_frame
def _decode_hw_frame(self, raw_frame: bytes) -> bytes:
# XXX construct
frame_data = raw_frame[1:len(raw_frame) - 5]
frame_chksum = raw_frame[len(raw_frame) - 5:-1]
got_frame_checksum = Pylontech.get_frame_checksum(frame_data)
assert got_frame_checksum == int(frame_chksum, 16)
return frame_data
def _decode_frame(self, frame):
format = construct.Struct(
"ver" / HexToByte(construct.Array(2, construct.Byte)),
"adr" / HexToByte(construct.Array(2, construct.Byte)),
"cid1" / HexToByte(construct.Array(2, construct.Byte)),
"cid2" / HexToByte(construct.Array(2, construct.Byte)),
"infolength" / HexToByte(construct.Array(4, construct.Byte)),
"info" / HexToByte(construct.GreedyRange(construct.Byte)),
)
return format.parse(frame)
def read_frame(self):
raw_frame = self.s.readline()
f = self._decode_hw_frame(raw_frame=raw_frame)
parsed = self._decode_frame(f)
return parsed
def scan_for_batteries(self, start=0, end=255) -> Dict[int, str]:
""" Returns a map of the batteries id to their serial number """
batteries = {}
for adr in range(start, end, 1):
bdevid = "{:02X}".format(adr).encode()
self.send_cmd(adr, 0x93, bdevid) # Probe for serial number
raw_frame = self.s.readline()
if raw_frame:
sn = self.get_module_serial_number(adr)
sn_str = sn["ModuleSerialNumber"].decode()
batteries[adr] = sn_str
logger.debug("Found battery at address " + str(adr) + " with serial " + sn_str)
else:
logger.debug("No battery found at address " + str(adr))
return batteries
def get_protocol_version(self):
self.send_cmd(0, 0x4f)
return self.read_frame()
def get_manufacturer_info(self):
self.send_cmd(0, 0x51)
f = self.read_frame()
return self.manufacturer_info_fmt.parse(f.info)
def get_system_parameters(self, dev_id=None):
if dev_id:
bdevid = "{:02X}".format(dev_id).encode()
self.send_cmd(dev_id, 0x47, bdevid)
else:
self.send_cmd(2, 0x47)
f = self.read_frame()
return self.system_parameters_fmt.parse(f.info[1:])
def get_management_info(self, dev_id):
bdevid = "{:02X}".format(dev_id).encode()
self.send_cmd(dev_id, 0x92, bdevid)
f = self.read_frame()
print(f.info)
print(len(f.info))
ff = self.management_info_fmt.parse(f.info[1:])
print(ff)
return ff
def get_module_serial_number(self, dev_id=None):
if dev_id:
bdevid = "{:02X}".format(dev_id).encode()
self.send_cmd(dev_id, 0x93, bdevid)
else:
self.send_cmd(2, 0x93)
f = self.read_frame()
# infoflag = f.info[0]
return self.module_serial_number_fmt.parse(f.info[0:])
def get_values(self):
self.send_cmd(2, 0x42, b'FF')
f = self.read_frame()
# infoflag = f.info[0]
d = self.get_values_fmt.parse(f.info[1:])
return d
def get_values_single(self, dev_id):
bdevid = "{:02X}".format(dev_id).encode()
self.send_cmd(dev_id, 0x42, bdevid)
f = self.read_frame()
# infoflag = f.info[0]
d = self.get_values_single_fmt.parse(f.info[1:])
return d
if __name__ == '__main__':
p = Pylontech()
# print(p.get_protocol_version())
# print(p.get_manufacturer_info())
# print(p.get_system_parameters())
# print(p.get_management_info())
# print(p.get_module_serial_number())
# print(p.get_values())
print(p.get_values_single(2))