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What does SIP stand for?

SIP stands for Serial Interface Port


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A port, or interface, that can be used for serial communication, in which only 1 bit is transmitted at a time.
IIC/I2C/TWI/SP??I Serial Interface Board Module Port For Arduino 1602LCD Display in Business & Industrial, Electrical & Test Equipment, Electronic Components, Semiconductors & Actives, LCDs & Displays | eBay
The 1-port serial WAN interface card (WIC-1T) provides serial connections to remote sites or legacy serial network devices such as Synchronous Data Link Control (SDLC) concentrators, alarm systems, and packet over SONET (POS) devices.
 Several devices collect data from sensors and need to send it to another unit, like a computer, for further processing. Data transfer/communication is generally [[wysiwyg_imageupload::]]done in two ways: parallel and serial. In the parallel mode, data transfer is fast and uses more number of lines. This mode is good for short range data transfer.Serial communication on the other hand, uses only one or two data lines to transfer data and is generally used for long distance communication. In serial communication the data is sent as one bit at a time. This article describes the interfacing of 8051 microcontroller (AT89C51) with a computer via serial port, RS232. Serial communication is commonly used in applications such as industrial automation systems, scientific analysis and certain consumer products. The microcontroller AT89C51 has an inbuilt UART for carrying out serial communication. The serial communication is done in the asynchronous mode. A serial port, like other PC ports, is a physical interface to establish data transfer between computer and an external hardware or device. This transfer, through serial port, takes place bit by bit.
FREE Download Comport TEST Software Serial Port checking RS232 test and More Tools For Computer Hardware Interface.RS232 Data Monitor
The desire to supply serial interface cards with two ports required that IBM reduce the size of the connector to fit onto a single card back panel. A DE-9 connector also fits onto a card with a second DB-25 connector that was similarly changed from the original Centronics-style connector. Starting around the time of the introduction of the IBM PC-AT, serial ports were commonly built with a 9-pin connector to save cost and space.