dcl man page on 4.4BSD

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DCL(4)		      BSD/hp300 Kernel Interfaces Manual		DCL(4)

     dcl — HP 98628A communications link

     device dcl0 at scode? flags 0x1

     The 98628A is a buffered EIA RS-232C (CCITT V.28) communications inter‐
     face.  It has one port with full modem control.

     Input and output for each line may set to one of following baud rates; 0,
     50, 75, 110, 134.5, 150, 200, 300, 600, 1200, 1800, 2400, 4800, 9600,

     An optional argument flags may be set to 1 if the line should be treated
     as hard-wired with carrier always present, or to 0 if modem control is

     Use HP cable "98626 & 98628 opts.002, RS232-C DCE CABLE, 5061-4216" to
     attach non-modem devices.	Use HP cable "98626 & 98628 opts.001, RS232-C
     DTE CABLE, 5061-4215" to attach modems.

     The 98628A has a 256 byte input silo and a 256 output silo. Input inter‐
     rupts happen on a per character basis.

     The high water and low water marks in the kernel tty routines are com‐
     pletely inappropriate for a device like this with a large input buffer.
     Don't use tandem mode if possible.	 A fast system can handle input at
     19.2K baud without receive overflow.

     For output to devices that make heavy use of XON/XOFF a write size of
     less then 256 will improve performance marginally.


     dcl%d: error 0x%x RESET CARD.  Where the errors are encoded:

	   0x06 card failure
	   0x0d uart receive overflow
	   0x0e receive overflow
	   0x0f missing external clock
	   0x10 cts false too long
	   0x11 lost carrier
	   0x12 activity timeout
	   0x13 connection not established
	   0x19 illegal databits/parity
	   0x1a register address out of range
	   0x1b register value out of range
	   0x-- unknown error


     Breaks received at a faster rate then 1 break every second will be recog‐
     nized as a single break.

     Console use is not supported.

     The RS-422/423/499, MTS-DSN/DL modes of the card are not supported.

BSD				 June 9, 1993				   BSD

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