View serial port information under Linux

RS232 serial Communication Interface: When the communication distance is close (<12m), can use cable direct connection, if the distance is farther, need to attach a modem.

Definition of 9 foot pin:

CDC data carrier detection, RXD receive data, TXD send data, DTR data interrupt preparation, GND signal ground, DSR data device ready, RTS request sent, CTS clear send, Dell ringing indication.

View serial port information under Linux

Check whether the serial port is available, can send data to the serial port, such as the COM1 port, Echo HelloWorld >/DEV/TTYS0
View the serial name using Ls-l/dev/ttys* generally under the name of the serial port all under Dev, if you do not plug in the serial card, the default is dev under the ttys*, the general ttyS0 corresponding com1,ttys1 corresponding COM2, of course, is not necessarily necessarily;
View Serial drive:cat/proc/tty/drivers/serial

[Email protected] root]# cat/proc/tty/driver/*
serinfo:1.0 Driver Revision:
0:uart:mpc52xx PSC mmio:0x80011300 irq:40 tx:10 rx:129 cts| dsr| Cd
usbserinfo:1.0 driver:2.0

For example, in Terminal input: DMESG | grepttys* display from the system boot to the current serial plug-in unplugged information, let me insert a USB to RS232 line on the computer, and then in the terminal input: DMESG | Grepttys*, it will show: USB 2-2.1:pl2303 Converter now attachedto ttyUSB0, this method can be used to determine the number of my newly inserted serial port line corresponding to the string.

View serial port information under Linux