Recent content by NickH

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    Short, Incomplete, and Unknown Exception Responses

    Yes, I did end up with just TX, RX, and Ground, and had no luck adding any other connections or loopbacks to defeat handshaking...spent more time on that than I'd like to admit (I tried almost every iteration possible I think).
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    Short, Incomplete, and Unknown Exception Responses

    David, Thank you again for the detailed and thoughtful response - very appreciated. Late last week I was sent the full electrical schematics for the unit which I am trying to communicate with, which is controlled (overall) by an OMRON CJ1M-CPU23 controller. While this controller does have a...
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    Short, Incomplete, and Unknown Exception Responses

    Repeated the (3) tests, adjusting polling registers by (+1) for each - 1) 47001-47014 (mix of Words & UINT) - returned Error (-8) 2) 47021-47039 (all UINT) - returned Modbus Error Code 0x8E and Modbus Exception Code 0x80 3) 47051 only (BOOL) - returned "Error, Modbus message invalid length...
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    Short, Incomplete, and Unknown Exception Responses

    Thank you for your response David - per your advice, I ran (3) tests, based on only polling registers 1) 47000-47013 (mix of Words & UINT) - returned Error (-8) 2) 47020-47038 (all UINT) - returned Error (-8) 3) 47050 only (BOOL) - returned "Error, Modbus message invalid length, short" See...
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    Short, Incomplete, and Unknown Exception Responses

    Forgot to add Exception Response Screenshot:
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    Short, Incomplete, and Unknown Exception Responses

    Interface Details: Modbus RTU via RS232, Serial to USB Converter Sartorius Biostat RM (PLC Controlled Device, Vendor non-standard Pinout) to Windows 10 Laptop Utilizing Chipkin CASModbusScanner Software to Test Issue - While the Device does respond to a Poll, I have only once gotten what...
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