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Would like to help. Have limited but growing C experience. Have 40+ years experience writing very detailed specifications for various control systems: Analog, DDC, time sharing, DCS (PLC networks as well as the dinosaurs)... Am familiar with various protocols including Modbus. Have used protocol analyzer to debug Modbus problems on a TDC 2000 several years ago. Can you suggest a task that needs to be done to further the cause. Thanks for your help. Bob Page, Computer Integrated Systems Inc, Houston, 281-497-7954, fax 281-870-1360