.\" SCCSID: @(#)dmf.4	3.1	11/24/87.TH dmf 4 VAX.SH Namedmf \- DMF32 communications interface.SH Syntax.B "device dmf0 at uba? csr 0160340 flags 0x????".br.ti +0.5i.B "vector dmfsrint dmfsxint dmfdaint dmfdbint dmfrint dmfxint dmflint".SH Description.NXS "dmf interface" "DMF32 communications interface".NXR "DMF32 communications interface".NXA "DMF32 communications interface" "DMF32 serial printer interface"The.PN dmfdevice provides eight lines of asynchronous serial line support with fullmodem control on two lines only.   The device driveralso supports a connection to a line printer through the line printerport of the DMF32..PPEach line attached to a DMF32 serial line port behaves as describedin .MS tty 4 .Input and output for each line can be set independently to run at anyof 16 speeds.  See .MS tty 4for the encoding..PPBit.I iof .PN flags can be specified for a.PN dmfto say that a line is not properly connected, and that theline should be treated as hardwired, with carrier always present.Thus, specifying ``flags 0x00f6'' in the specification of.PN dmf0would cause lines 0 and 1 on the DMF32 to be treated as modem lines, while lines 2 through 7 are direct connect no-modem lines.It is important to specify lines 2 through 7 as direct connect, because thedevice does not support modem control on these lines..PPThe.PN dmfdriver normally uses input silos and polls for input at each clocktick (10 milliseconds)..NT Caution.NXR(c) "DMF32 communications interface" "restricted"The DMF32 will discard incoming characters on the lines withfull modem control, if carrier is not present..NE.SH RestrictionsThe DMF32 provides other services, but these arenot supported by the driver..SH Diagnostics.B "dmf%d: NXM line %d" .brNo response from UNIBUS on a .PN dma transfer within a timeout period.  This is often followed by a UNIBUS adaptererror.  This occurs most frequently when the UNIBUS is heavily loadedand when devices that monopolize the bus, such as RK07s, are present.It is not serious..PP.B "dmf%d: silo overflow".brThe character input silo overflowedbefore it could be serviced.  This can happen if a hard error occurswhen the CPU is running with elevated priority, as the system then prints a message on the console with interrupts disabled..PP.B "dmfsrint".br.B "dmfsxint".br.B "dmfdaint".br.B "dmfdbint".brOne of the unsupported ports of the DMF32 interrupted becauseof a problem.  Check your interrupt vectors for a conflict withanother device..SH Files.PN /dev/tty??.TP 15.PN /dev/ttyd?(modem lines only).SH See Alsodmfsp(4), tty(4), MAKEDEV(8)