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Full Discussion: serial port device path
Top Forums UNIX for Dummies Questions & Answers serial port device path Post 54213 by Perderabo on Thursday 5th of August 2004 11:22:37 AM
Old 08-05-2004
Most systems will have both a cua* and a tty* device. The major number will be the same. The minor number will be a little different. One is for calling out. The other is for receiving a call.

When a program like getty tries to open the port, it must block and wait until the modem answers a call. After the modem established a link with the remote modem, it will raise DCD (data carrier detect). At this point the open system call will finally succeed and the getty will display a prompt. This will be using a tty* style special file.

But a program like tip or cu can't wait for DCD. The open must succeed immediately. Then the program will send atdt5551212 or whatever to the modem to start a call. These programs need to use a cua* style device.
 

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ct(1)							      General Commands Manual							     ct(1)

NAME
ct - spawn getty to a remote terminal (call terminal) SYNOPSIS
n] n] speed] telno... DESCRIPTION
dials telno, the telephone number of a modem that is attached to a terminal, and spawns a getty(1M) process to that terminal. tries each line listed in file until it finds an available line with appropriate attributes or runs out of entries. If no lines are free, asks whether it should wait for a line, and if so, how many minutes it should wait before giving up. searches again for an available line at one-minute intervals until the specified limit is exceeded. Note that normally, disconnects the current tty line, so that the line can answer the incoming call. This is because assumes that the current tty line is connected to the terminal to spawn the process. The telno argument specifies the telephone number, which can be composed of characters through and Use equal signs to signify secondary dial tones and minus signs for delays at appropriate places. The maximum length of telno is 31 characters. If more than one telephone number is specified, tries each in succession until one answers; this is useful for specifying alternate dialing paths. When disconnects the current line, should not be spawned on this line if is going to make use of the same line to reconnect. To do this, set the entry for this line in the file to instead of (see inittab(4)). Options recognizes the following options and command-line arguments: Instruct to wait for a line a maximum of n number of minutes, if lines are busy. If this option is specified, does not query the user about whether to wait for a line. Produce detailed output from program execution on the standard error output. This option is used for debugging. The debugging level n is a single digit; the most useful value is Prevent from disconnecting ("hanging up") the current tty line. This option is necessary if the user is using a different tty line than the one used by to spawn the Verbose mode. The option is used with the option and causes to send a running narrative to the standard error output stream. Set the data rate where speed is expressed in baud. The default rate is After the user on the destination terminal logs out, prompts, If the response begins with the letter the line is dropped. Otherwise, is restarted and the prompt is printed. Of course, the destination terminal must be attached to a modem that can automatically answer incoming calls. FILES
SEE ALSO
cu(1), login(1), uucp(1), getty(1M), uugetty(1M). ct(1)
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