Recent content by fearless

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    Quandary: Software Layout of Registers

    >Though it might work for some slaves there are slaves that >will have problems with this approach. I totally understand and agree with your answer, but you missed an important detail: I am implementing the code for a modbus slave, not a master, so I can guarantee proper behavior. Given...
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    Quandary: Software Layout of Registers

    I am laying out register definitions for an RTU based slave device. Previously, I would leave holes in my Modbus address map for registers that spanned more than one 16-bit word. For example, for two floating point registers (32 bits each), I might define the following (note that Modbus Addr...
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    Read Multiple Registers of Different Widths

    P.S.: A similar question applies to Write Multiple Registers (function code 16 [0x10])...
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    Read Multiple Registers of Different Widths

    I'm implementing a Modbus stack for microcontrollers. And I have a question about an implementation detail. Imagine we have the following Modbus holding registers defined: <pre> 40001 00 UINT16 regA 40002 01 FLOAT32 regB 40004 03 UINT16 regC </pre> What's the...
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