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Modbus is a serial communications protocol commonly used by PLCs (programmable logic controllers) and other industrial control systems. While originally based on traditional serial communications many extensions exist to allow communication over other networks such as TCP/IP.

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MODBUS masters start polling of all slaves on the same physical channel, and then the ones that timeout for N times are the ones that should be considered not responding. It's up to a MODBUS master …
answered May 18 '12 by avra
2
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Take a look at MODBUS simulator here. This one is also worth a look. For Delphi components take a look here, here, and if you don't mind the nag screen here. …
answered Feb 9 '11 by avra
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other settings via web browser, and touch screen devices with embedded Linux where you set these settings via setup screens and/or menus, but these are more expensive and not so common devices that fit less then 3% of the total number of all MODBUS devices. …
answered Aug 8 '12 by avra
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Take a look at MODPOLL. With this simple utility you can read registers from MODBUS TCP/RTU/ASCII slaves. When you make it work and read first registers, then you can analyze it's source code and use … it from your PC. To use MODBUS from python, you can use this, or just parse console output result of MODPOLL. You choose. …
answered Dec 26 '10 by avra