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In Linux, each serial port is referenced by two device names - one being (for the first serial port) /dev/ttyS0 versus /dev/cua0. Although these both refer to the same physical port, one important distinction between the way Linux treats these two device names has to do with the DCD line.
cu ("call Unix") is a Unix utility for establishing a connection between two computer systems via a serial port to another computer system. When cu was originally created, connections to remote systems were most often done by phone, and cu was used in conjunction with UUCP utilities to transfer data via a modem.
Tera Term (alternatively TeraTerm) is an open-source, free, software implemented, terminal emulator (communications) program. It emulates different types of computer terminals, from DEC VT100 to DEC VT382. It supports Telnet, SSH 1 & 2 and serial port connections.
Minicom is a menu-driven communications program. It also has an auto ZMODEM download. It now comes packaged in most major Linux distribution repositories such as Debian, Ubuntu and Arch Linux. A common use for Minicom is when setting up a remote serial console, perhaps as a last resort to access a computer if the LAN is down.
Terminal program for Windows, Linux, OpenBSD, NetBSD, Mac OS X, and FreeBSD Telix: Character: Serial port: MS-DOS: Terminal emulator for MS-DOS (discontinued since 1997) Tera Term: Character: Serial port, Telnet, xmodem and SSH 1 & 2 Windows: Tera Term is an open-source, free, software terminal emulator for Windows Terminal: Character: Local macOS
PuTTY (/ ˈ p ʌ t i /) [4] is a free and open-source terminal emulator, serial console and network file transfer application. It supports several network protocols, including SCP, SSH, Telnet, rlogin, and raw socket connection. It can also connect to a serial port. The name "PuTTY" has no official meaning. [5]
In modern serial ports using a UART integrated circuit, all these settings can be software-controlled. Hardware from the 1980s and earlier may require setting switches or jumpers on a circuit board. The configuration for serial ports designed to be connected to a PC has become a de facto standard, usually stated as 9600/8-N-1.
A simple serial interface loopback test, called paperclip test, is sometimes used to identify serial ports of a computer and verify operation. It utilizes a terminal emulator application to send characters, with flow control set to off, to the serial port and receive the same back.