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Hi guys,
Excel sheet in whitepaper section clearly says 2700 can be set as a negative number however when I call client.write_register(2700, -5000) I get the following exception
File "/usr/local/lib/python3.6/site-packages/pymodbus/register_write_message.py", line 42, in encode
packet += struct.pack('>H', self.value)
struct.error: argument out of range
Line executes as expected with a positive number. Is this a pymodbus issue? Any thougths on how to get around it?
Mike
Figured it out - must use a 16bit int
from pymodbus.payload import BinaryPayloadBuilder, Endian, BinaryPayloadDecoder
builder = BinaryPayloadBuilder(byteorder=Endian.Big, wordorder=Endian.Big)
builder.reset()
builder.add_16bit_int(-5000)
payload = builder.to_registers()
client.write_register(2700, payload[0])
