====== Delta DVP ======
Communication protocol for Delta Electronics DVP series PLC.

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The protocol supports addressing PLC registers via the DVP protocol, using letter type prefixes similar to those used in programs for PLC data.

=== Bit type ===
  *X - digital inputs
  *Y - digital outputs
  *M - auxilary relays
  *T - timer states
  *С - counter state
  *S - sequential latched relay

=== Word Registers ===
  *T - current timer value
  *С - current counter value
  *D - current value of the data register