Protocol comparison chart rs232 rs422 rs485 cable single ended. Selecting a cable the major consideration in choosing an rs232 cable is, what devices are to be connected. Modern hardware designs use innovative serial communication protocols like usb, ethernet, and wifi. It incorporates ftdis ft232rq usb to serial uart interface ic. But because usb and ethernet require powerful interfaces with complex protocols, many efficient devices utilized rs232, rs485, and rs422 which is what this note is all about. According serial data cables for these systems require the additional lines to be incorporated into the serial data cables for them to operate correctly. For even and odd parity, the serial port sets the parity bit the last bit after the data bit to a value to ensure that the data packet has an even or odd number of logic. Rs 232 is intended to be a standard but not all manufacturers abide by it. On this page null modem, an introduction original use of rs232 null modem without handshaking null modem with loop back handshaking null modem with partial handshaking null modem with full handshaking null modem layout selection table software for file transfers. It is used in serial communication up to 50 feet with the rate of 1. The cables provide a fast, simple way to connect devices with a rs232 level serial uart interface to usb. The 25 pin serial conne ctor is a male on the pc and a female on the cable. Table 1 shows the signal names, and functions of the rs232 serial port pinout.
To connect this port to a standard 25pin port, a 9to25pin adaptor cable can be utilized, or the user can create his own cable specifically for that purpose. Rs232 serial interface cables should be shielded, low capacitance cables, ideally designed specifically for serial data transmission. Historically, rs232 communication protocol is an old serial communication protocol developed by eia electronics industry alliancetia telecommunications industry association232 in the year 1962. Serial transmission involves the sending of data one. Panelview terminal panelview plus terminal versaview ce terminal industrial applications may require especially long run lengths, which. More comprehensive systems may utilise the additional lines provided by rs232. As it obtains the voltage for the path used for the data exchange between the devices. Rs232 datasheet, rs232 pdf, rs232 data sheet, rs232 manual, rs232 pdf, rs232, datenblatt, electronics rs232, alldatasheet, free, datasheet, datasheets, data sheet. The different connector types can cause problems in connecting devices. The most common serial communication protocols are rs232, rs485, rs422, usb, and ethernet.
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