ADPRO VM22A Installation & User Manual
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ADPRO VM22A, Issue 6 218.0 Serial ProtocolIn VM22A mode, channel selection is achieved using a serial protocol via the BCDsignal lines. Figure 10 shows the serial protocol timing diagram, and Table 4 showsthe relationship of the serial signals to the BCD lines.SERIAL PROTOCOLExpansion I/O Pin Signal Line Function14 BCD 0 Serial Clock7 BCD 1 Serial Data15 BCD 2 Serial StrobeTable 4 – Relationship of the Serial Signals to the BCD linesFigure 10 – Serial Protocol Timing diagramA3 A2 A1 A0 D3 D2 D1 D0ClockDataStrobe>0 seconds >0 seconds15nS data settlet 0A ..A is the Unit ID in binary format (A is LSB).D ..D is the channel in inverse BCD format, refer toTable 3 (D is LSB).0 3 00 30Where: |
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