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<title>one-modbus architecture</title>
<desc>Core engine via Modbus RTU splits into three paths: direct local, via protocol converter, and DTU with sub-paths</desc>
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<text x="325" y="480" text-anchor="middle" dominant-baseline="central" font-family="sans-serif" font-size="9" fill="#854F0B">e.g. Siemens PPI · Mitsubishi</text>
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