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• The module is a single-slot, backplane-compatible solution. Each port is capable of sending and receiving large ASCII character strings or byte streams of up to 4096 characters or bytes. Many different serial communication devices can be integrated into the ControlLogix platform by building upon the sample ladder logic provided for this module.
• Multiport Serial Boards With over thirty years of experience in multiport serial board technology and development, Moxa is able to offer one of the most comprehensive selections of industrial-grade multiport serial cards on the market. We offer serial boards for a variety of slot types, from ISA to PCI Express (PCIe) to PC/104.
• The PCI2S1PVA 2 Port 16C550 Serial and 1 Port EPP/ECP Parallel Slot Saver PCI Card gives you two 16C550 serial ports with data transfer speeds up to 460.8Kbps on the card, and one EPP/ECP parallel port with data transfer speeds up to 1.5Mbps (Up to 3x faster than onboard parallel ports) on a separate riser.

An asynchronous port on the computer used to connect a serial device to the computer and capable of transmitting one bit at a time. Serial ports are usually identified on IBM compatible computers as COM (communications) ports. For example, a mouse might connect to COM1 and a modem to COM2. The picture shows the DB9 serial connector on a cable.

Where is the serial port on a computer?

The serial port is found on the back of the computer and is part of the motherboard.

With the introduction of USB, FireWire, and other faster solutions serial ports are rarely used compared to how often they've been used in the past. Also, many new computers and laptops no longer have a serial port.

Identifying a serial port

In the above graphic of a serial port, you can notice the DB9 serial port connection is easy to identify. The connection is in the shape of the letter D, is a male connector, and has 9 pins.

What is the serial port used for?

Below is a listing of various hardware components that can be purchased and used with your serial port.

Mouse - One of the most commonly used devices for serial ports, usually used with computers with no PS/2 or USB ports and specialty mice.
Modem - Another commonly used device for serial ports. Used commonly with older computers, however, is also commonly used for its ease of use.
Network - One of the original uses of the serial port, which allowed two computers to connect together and allow large files to be transferred between the two.
Printer - Today, this not a commonly used device for serial ports. However, was frequently used with older printers and plotters.

Serial port pin information

Below is a listing of each of the pins on the DB9 connector, their purpose, and signal name.

With many computers, the serial port is labeled as '10101' which are ones and zeros to represent binary. A user may also interpret the number '1' as the letter 'I' and the zeros as the letter 'O' and call it the 'IOIOI' port.

As shown above, pin one is in the top-left portion of the port and pin 9 is in the bottom right.

Most of today's computers are eliminating the serial port in favor of USB ports.

Related pages

Com port, Connection, Data cable, Hardware terms, Motherboard terms, Parallel port, Port, RS-232, Serial

The serial port is a type of connection on PCs that is used for peripherals such as mice, gaming controllers, modems, and older printers. It is sometimes called a COM port or an RS-232 port, which is its technical name. If that's not enough to confuse you, there are two types of serial ports -- DB9 and DB25. DB9 is a 9-pin connection, and DB25 is, you guessed it, a 25-pin connection.

Serial Port Slot Numbers

A serial port can only transmit one bit of data at a time, whereas a parallel port can transmit many bits at once. The serial port is typically the slowest port you'll find on a PC, if you find one at all. Most newer computers have replaced serial ports with much faster and more compatible USB ports.