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AD(4)		       BSD/vax Kernel Interfaces Manual			 AD(4)

     ad — Data Translation A/D converter

     device ad0 at uba0 csr 0170400 vector adintr

     The ad driver provides an interface to the Data Translation A/D con‐
     verter.  This is not a real-time driver, but merely allows the user
     process to sample the board's channels one at a time.  Each minor device
     selects a different A/D board.

     The driver communicates to a user process by means of ioctl(2)s. The
     AD_CHAN ioctl selects which channel of the board to read.	For example,

	   chan = 5;
	   ioctl(fd, AD_CHAN, &chan);

     selects channel 5.	 The AD_READ ioctl(2) actually reads the data and
     returns it to the user process.  An example is

	   ioctl(fd, AD_READ, &data);



     The ad driver appeared in 4.1BSD.

4.2 Berkeley Distribution	 June 5, 1993	     4.2 Berkeley Distribution

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