Serial Communication 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 still get the job done and are used in various ways today.
Here are 7 things that are useful to know about D-subminiature connectors:
1. D-subminiature connectors were once among the smallest connectors used on computer systems. Not any more! They are named after 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 version size has three rows of pins.
3. With individual pins to carry serial data, D-sub connectors are very easy to customize. The popular 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. This, with 78 pins, measures 1.5cm tall and 6.7cm wide.
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 metres.
5. 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.
6. 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.
7. 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.
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Stuart Berry
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