PCIx Specifications - Pro-Dex, Oregon Micro Systems - #101

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COMMAND STRUCTURE COMMAND DESCRIPTIONS PCIx User’s Manual 5-65 DBI INVERT DIRECTION BIT The DBI command inverts the logic of the direction control output of the addressed axis or axes. By default, the direction output of an axis is a TTL low when traveling in the positive direction and high when traveling negative. After using the DBI command, the direction bit will be high when traveling positive and low when traveling negative. This is useful for inverting the logical direction of a motor when the encoder counts opposite the motor direction. This command can be canceled using the DBN command. To make this the default at power up or reset, use the AP command. Example: Set the direction outputs for axes Z and T to output high when traveling positive and low when traveling negative. Leaves X and Y as they are. Enter: AZ; DBI; AT; DBI; Or AA; DBI,,1,1; Response: None. Note: In AA or AM mode a null value in the argument list specifies that the sense of that direction bit is not to be changed. QUEUE REQUIREMENTS FORMAT MODE REQUIREMENTS DBI; AX – AT 1 DBIb,b,b,b; AA-AM 1 - AA/CD Not Valid Related commands: BI, ?DB, DBN, SVI, SVN, UN