Common Applications For Serial Ports
The RS-232 standard is used by many specialized and custom-built devices. This list includes some of the more common devices that are connected to the serial port on a PC. Some of these such as modems and serial mice are falling into disuse while others are readily available.
Serial ports are very common on most types of microcontroller, where they can be used to communicate with a PC or other serial devices.
- Dial-up modems
- GPS receivers (typically NMEA 0183 at 4,800 bit/s)
- Bar code scanners and other point of sale devices
- LED and LCD text displays
- Satellite phones, low-speed satellite modems and other satellite based transceiver devices
- Flat-screen (LCD and Plasma) monitors to control screen functions by external computer, other AV components or remotes
- Test and measuring equipment such as digital multimeters and weighing systems
- Updating Firmware on various consumer devices.
- Some CNC controllers
- Uninterruptible power supply
- Stenography or Stenotype machines.
- Software debuggers that run on a second computer.
- Industrial field buses
- Printers
- Computer terminal, teletype
- Older digital cameras
- Networking (Macintosh AppleTalk using RS-422 at 230.4 kbit/s)
- Serial mouse
- Older GSM mobile phones
- Some Telescopes
Since the control signals for a serial port can be easily turned on and off by a switch, some applications used the control lines of a serial port to monitor external devices, without exchanging serial data. A common commercial application of this principle was for some models of uninterruptible power supply which used the control lines to signal "loss of power", "battery low alarm" and other status information. At least some Morse code training software used a code key connected to the serial port, to simulate actual code use. The status bits of the serial port could be sampled very rapidly and at predictable times, making it possible for the software to decipher Morse code.
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