.TH UART 3 .SH NAMEuart, eia \- serial communication control.SH SYNOPSIS.nf.B bind -a #t /dev .B /dev/eia0.B /dev/eia0ctl.B /dev/eia0status.B /dev/eia1.B /dev/eia1ctl.B /dev/eia1status\&....fi.SH DESCRIPTION.PPThe serial line devices serve a one-level directory,giving access to the serial ports.Device.I nis accessed through.BI eia n(the data file),.BI eia n ctl(the control file), and.BI eia n status(the read-only status file).Reads of the data file will block until at least one byte is available.Thecontrol fileconfigures the port.It accepts the following commands:.TP.BI b nSet the baud rate to.IR n ..TP.BI c nSet hangup on DCD if.I nis non-zero; else clear it..TP.BI d nSet DTR if.I nis non-zero;else clear it..TP.BI e nSet hangup on DSR if.I nis non-zero; else clear it..TP.B fFlush output queue..TP.B hClose input and output queues..TP.BI i nEnable/disable the FIFOs.If.I nis zero the FIFOs are disabled;otherwise.I nis taken as a trigger level for the FIFOs.The trigger levels supported are device dependant,but usually include 1, 4 and 8.An unrecognised,but non-zero,value of.I ncauses the maximum-supported trigger level to be set..TP.BI k nSend a break lasting.I nmilliseconds..TP.BI l nSet number of bits per byte to.IR n .Legal values are 5, 6, 7, or 8..TP.BI m nObey modem CTS signal if.I nis non-zero;else clear it..TP.B nMake writes non-blocking..TP.BI p cSet parity to odd if.I cis.BR o ,to even if.I cis.BR e ;else set no parity..TP.BI q nSet input and output queue limits to.IR n ..TP.BI r nSet RTS if.I nis non-zero;else clear it..TP.BI s nSet number of stop bits to.IR n .Legal values are 1 or 2..TP.BI w nSet the uart clock timer ton times 100us..IP.PPThe statusfiles contain a textual representation of the status of the line, in the format of thecommands used on thecontrolfile..SH SOURCE.B /sys/src/9/port/devuart.c.br.B /sys/src/9/*/uart*.c