9 Things You Need to Know about D-Subminiature Connectors

November 2, 2017 at 8:00 AM


Serial communication once reigned supreme. It used to be one of the most popular ways to connect peripherals such as printers, scanners, mice and joysticks to PCs. The most common connector type for serial communication was the D-subminiature connector, also called D-sub. Though they have been replaced in some applications, D-sub connectors are still relevant and used in many ways today.


Here are 9 things you need to know about D-subminiature connectors:


1.  D-subminiature connectors were once among the smallest connectors used on computer systems. They are named for their D-shaped metal connector shell. The metal shell surrounds two or more parallel rows of pins or sockets that carry the data in series.


2.  There are five different connector shell sizes. Each shell size can have two different configurations of pins. The standard shell size has two rows of pins and the high-density versions have three rows of pins.


3. With individual pins to carry serial data, D-sub connectors are very easy to customize. The DB9 is one of the standard configurations and has the smallest shell size, with 9 pins in the shell and measuring 1.3cm tall and 3.1cm wide. The largest, high-density configuration is HD78, with 78 pins it measures 1.5cm tall and 6.7cm wide. To see all shell sizes and D-sub configurations, click here.


4.  Cables using D-sub connectors can cover much longer lengths than other cables. RS-232, the current common standard for serial data, doesn’t have a defined length limit and RS-422 can be used over hundreds of meters with special equipment. On the other hand, USB has a length limit of five meters.


5.  Serial communication tends to be slow, especially over long lengths. Breaks in communication can cause software on a PC to freeze unexpectedly.


6.  D-Sub connectors are large, especially when compared to newer connector designs. This makes them difficult to connect and disconnect in tight spaces. Though right-angle adapters help in small spaces by allowing a right-angle bend without damaging the connector.


7.  Because the pins are exposed on these connectors, they can be easily bent or broken off in the shell. The best way to avoid broken pins is to use a D-sub plug or jack cover to protect the pins from being damaged when not mated. Also, gender changers and socket savers can help reduce stress from repeated mating cycles.


8.  D-subminiature connectors can be mated without thumbscrews but a friction-fit it does not always hold. Using thumbscrews makes for a more secure connection, but it does take longer to plug and unplug the connector.


9.  There are still many devices with DB9 ports and plenty of conversion options for legacy D-sub connectorized products. Converters to and from RS232/422/485 to USB, Ethernet and other technologies allow you to use your old serial device with many of today’s computers.


Long Live RS-232!

December 3, 2015 at 8:00 AM


The world of technology is in a constant state of evolution. New devices become obsolete soon after their release, surpassed by upgraded versions.  When a device or standard remains relevant for five years, it feels like a lifetime.


RS-232 has done the unthinkable and achieved the technological equivalent of immortality. It remains a viable technology more than 50 years after its inception.


RS-232 is a telecommunications standard for serial communication transmission of data that was mainly used in computer serial ports.  It was used to connect data terminal equipment, such as a computer terminal, to data circuit-terminating equipment, such as a modem.


RS-232 was once a standard feature on most personal computers to connect printers, modems, mice and other devices. It is still used extensively in embedded computer development systems, scientific instruments and industrial control equipment.


Everyday applications of RS-232 include gas pumps that allow you to pay at the pump with a credit card and healthcare technology such as mobile MRI units, fetal monitors and kidney dialysis machines.


RS-232 serial ports are also commonly used to communicate to headless systems, such as servers that don’t have a monitor or keyboard, and in embedded systems when no network connection is available.


On its list of attributes, RS-232 is a proven technology, it’s cost effective, flexible and widely available. It uses simple wiring and connectors, is included in most embedded processors and features easy implementation software.


Wireless RS-232 systems offer additional benefits including extended range capabilities, portability and ease of installation.  New and legacy systems can use wireless RS-232 connectivity providing added application support.


RS-232 has proven itself in the ever-changing technology industry. After more than half a century, it continues to gain a place in new applications. For RS-232 the end is nowhere in sight!


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