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Modbus Max-Device-ID too low for devices with high IDs
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#1,657 opened on Jul 19, 2025
Area: IoT.DevicesPriority: LowType: Feature requestgood first issuetrivial
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Description
Library/API/IoT binding
Modbus
Visual Studio version
VS2022.17.4
.NET nanoFramework extension version
No response
Target name(s)
ALL
Firmware version
N/A
Device capabilities
No response
Description
There are devices out there (i.e. https://www.amazon.com/dp/B07ZYVZZKK?ref=ppx_yo2ov_dt_b_fed_asin_title - See section #3 "Read device ID") that use a high ID during calibration or readout of their real ID.
/// <summary>
/// The highest accepted device id on RTU protocol.
/// </summary>
public const byte MaxDeviceId = 0xF7; // 247
This number needs to be increased to 255 to be able to read these parameters off these devices
How to reproduce
Try to access any device with a system parameter device ID larger than 247 like https://www.amazon.com/dp/B07ZYVZZKK?ref=ppx_yo2ov_dt_b_fed_asin_title
Expected behaviour
Should be possible somehow. Maybe with a special call that allows to address these high numbers
Screenshots
No response
Sample project or code
No response
Aditional information
No response