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![]() What Is A Serial Interface Trial Automation SystemsHowever, serial ports are still frequently used in applications demanding simple, low-speed interfaces, such as industrial automation systems, scientific instruments, point of sale systems and some industrial and consumer products.To interface with these and other devices, USB-to-serial converters can quickly and easily add a serial port to a modern PC. This IC converts characters to and from asynchronous serial form, implementing the timing and framing of data specified by the serial protocol in hardware. The IBM PC implements its serial ports, when present, with one or more UARTs. These early home computers often had proprietary serial ports with pinouts and voltage levels incompatible with RS-232. As PCs evolved serial ports were included in the Super IO chip and then in the chipset. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. November 2020 ) ( Learn how and when to remove this template message ). Devices are divided into two categories: data terminal equipment (DTE) and data circuit-terminating equipment (DCE). A line that is an output on a DTE device is an input on a DCE device and vice versa, so a DCE device can be connected to a DTE device with a straight wired cable, in which each pin on one end goes to the same numbered pin on the far end. If it is necessary to connect two DTE (or DCE) devices together, a cable with reversed TX and RX lines, known as a cross-over, roll-over or null modem cable must be used. With D-subminiature connectors, the male connectors have protruding pins, and female connectors have corresponding round sockets. Either type of connector can be mounted on equipment or a panel; or terminate a cable. In this circumstance, a gender changer can be used to correct the mismatch. The EIATIA-561 standard defines a pinout using this connector, while the rollover cable (or Yost standard) is commonly used on Unix computers and many network devices, such as equipment from Cisco Systems. The Macintosh included a standard set of two ports for connection to a printer and a modem, but some PowerBook laptops had only one combined port to save space. Digital Equipment Corporation defined their own DECconnect connection system which is based on the Modified Modular Jack (MMJ) connector. This is a 6-pin modular jack where the key is offset from the center position. As with the Yost standard, DECconnect uses a symmetrical pin layout which enables the direct connection between two DTEs. The DB-25 connector includes a second protective ground on pin 1, which is intended to be connected by each device to its own frame ground or similar. Connecting this to pin 7 (signal reference ground) is a common practice but not recommended.
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