These are stress ratings only, and functional operation of the device at. Max3485 datasheetpdf 4 page maxim integrated products. Rs422, also known as tiaeia 422, is a technical standard originated by the electronic industries alliance that specifies electrical characteristics of a digital signaling circuit. It was designed for data exchange between dte data terminal equipment or pc and dce data communication equipment or modem. As an rs 232 to rs 485 converter the 485i can be configured as a 2 wires or 4. Rs 422rs 485 async fiber optic modem tc1520 async data rates up to 500 kbps rs 422, 2 or 4wire rs 485. Selecting a cable the major consideration in choosing an rs 232 cable is, what devices. Rs422 serial port connector pin layout activexperts. Rs422 systems can transmit data at rates as high as 10. The highly flexible universal network connector supports rs232, x. The rep485 422 9e has a db9 female connector on one rs 485 rs 422 port and a db9 male connector on the other rs 485 rs 422 port. Rs232 connector is a port used for data exchange between equipments. The con485 422 ee4 has a db9 female connector on the rs 232 serial port, and either a db9 male connector, rj45 female connector or terminal block with builtin selectable 120ohm termination option.
Rs 422and rs 485initially might appear to be similar, but are distinct, and interchangeability is determined by the bus architecture. This version also allows you to connect the rs 422 signals via a terminal board instead of a db9 connector. The terminal block plugs into the rs 485 rs 422 port, providing screwlug wire termination. The rs 485standard is written to be electrically compatible with rs422. The adam45204522 converter lets you take advantage of rs 422 and rs 485 on systems originally. Power is 12vdc or 115230vac with an external power cube. Application of rs 422 data to an lvds receiverthe r1, r2, and r3 resistor divider network collectively isa total differential load of 100. Rs 232 pinout connects directly to a computers com port or any other dte device. For industrial and commercial applications that require enhanced reliability, it is also equipped with 2 kv electrical.
The con485422ee9 has a db9 female connector on the rs232 serial port, and either a db9 male connector, rj45 female connector or terminal block with. Usb rs422pcb connector pin out and mechanical details. This application note attempts to cover enough technical details so that the system designer will have considered all the important aspects in his data system design. Rs232 connector pinout, configuration, features, circuit.
The need for rs232 came from limitations raised by parallel data exchange. Most industrial computer systems come with standard rs 232 serial ports. Usb to rs422 uart serial converter pcb datasheet version 1. Db9 male for rs 232 and terminal block for rs 422 485 mgate mb3270mb3270i. Since both rs 422 and rs 485 are data transmission systems that use balanced differential signals, it is appropriate to discuss both systems in the same publication. Esd protection for rs 422 ios 15kv human body model hbm. It was intended to replace the older rs 232c standard with a standard that offered much higher speed, better immunity from noise, and longer cable lengths. Rs 232, rs 422 rs 485 serial server transports 4 ch. Each usbrs422 cable contains a small internal electronic circuit board, utilising the ft232r, which is encapsulated into the usb connector end.
To illustrate their basic differences, a condensed description of each standard is presented in the following subsections. Converters are configured to transmit both directions in an rs 232 and rs 422 system. Rs422rs 485 interface ic are available at mouser electronics. Rs 485 rs 422 transceiver in sot package absolute maximum ratings stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. The adapter can support the host computers tcpip protocol stack or an application can be written to use the api for a variety of different functions. Throughout this document the generic terms of rs 422 and rs 485 are used when referring to equipment and. All product specifications are subject to change without notice. Using standard sc type fiber connector, the modules fiber optic ports can accommodate a wide range of fiber optic cable sizes, including 62. Rs 485 rs 422 communication operates from a single. Rs232 uses serial communication protocol where data exchange is done bit by.
The terminal block plugs into the rs 485 rs 422 port, providing screwlug wire terminations for the port for easy installation. Rs232 pinout standards exist for both db9 and db25 connectors as shown below. Rs422 datasheet, rs422 pdf, rs422 data sheet, rs422 manual, rs422 pdf, rs422, datenblatt, electronics rs422, alldatasheet, free, datasheet, datasheets, data sheet. The il422 was the first isolated rs 422 interface in a standard 16pin soic package to meet the ansi standards eiatia 422 b and rs 485. The rs 422 and rs 485 standards overcome these limitations by using differential voltage lines for data and control signals. Inline function terminal ib il rs 485422pac 2861933. Activate javascript in order to enable the use of all functions of the website. Rs422 is a serial communications standard that provides asynchronous communication capabilities, such as. Rs422 datasheet23 pages fairchild lvds compatibility. Low power rs485rs422 transceiver stmicroelectronics.
Rs 232, rs 422, rs 485 operation modes disabled, ethernet modem, pair connection, real com, reverse telnet, tcp client, tcp server, udp baudrate nport 51105110t. Rs 422 modes and up to 1mbps in rs 232 modes pin selectable 250kbps slew limiting 3 drivers, 5 receivers rs 232v. Rs 485 rs 422 port conforms to eia rs 485 422 indicators. Inline rs 485 422 function terminal block, complete with accessories connector and labeling field, 1 serial input and output channel javascript is not active in your browser. Its 6x bidirectional channels of rs 422 are electrooptically isolated from system interfaces and concentrated onto a. Rs 422 485 signals and power inputs connect to the terminal block. Rs422 is a serial communications standard that provides asynchronous communication capabilities, such as hardware flow control, software flow control, and parity check. It converts td and rd rs 232 lines to balanced rs 422 or rs. The device contains one driver and one receiver in half duplex configuration. Unlike rs 232, rs422 is capable of data transmissions over long distances up to 4000 feet.
The il422 has current limiting and thermal shutdown features to protect against output short circuits and bus contention situations that could cause excessive power dissipation. The maximum cable length is 5 meters, according to the usb 2. Since both rs 422 and rs 485 are data transmission systems that use balanced differential signals, it is. Rs 422 datasheet, rs 422 pdf, rs 422 data sheet, rs 422 manual, rs 422 pdf, rs 422. Future technology devices international limited ftdi unit1, 2 seaward place, centurion business park, glasgow g41 1hh united kingdom. Amphenol high speed solutions is pleased to introduce a new multichannel rs422 data concentrator and extender. This is a standalone unit with 32vdc power interface to the system. Though widely accepted, rs 232 has limited transmission speed, range, and networking capabilities. Il422 isolated rs422rs485 interface product datasheet. Serial type rs 232rs232 422 485 rs 422 485, software selectable rs 232 422 485 serial connector db9, db25 db9 serial data rate 230 kbps per port simultaneously 230 kbps per port simultaneously 230 kbps per port simultaneously 230 kbps per port simultaneously downstream usb ports 4 16port models only 1 separately isolated 0 features. Rs 422 datasheet, rs 422 pdf, rs 422 data sheet, rs 422 manual, rs 422 pdf, rs 422, datenblatt, electronics rs 422, alldatasheet, free, datasheet, datasheets, data. February 2009 rev 16 119 19 st485b st485c low power rs485rs422 transceiver features low quiescent current.
One important factor in establishing a good, reliable communication circuit is cable selection. Rs 232 signals interface through a db9 female connector or a terminal block. Its 6x bidirectional channels of rs 422 are electrooptically isolated from system interfaces and concentrated onto a single channel. Two terminal blocks are included one for each rs 485 rs 422 port. The st3485e device transmits and receives at a guaranteed data rate of at least 12 mbps. For this purpose most pcs now use a reduced function 9 pin d type connector rathe r than the full function 25 way d type. 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. Pdf rs 485 rs 232 64byte at485, pci485, pcmcia485 rs 422 at232, pcmcia serial scsi 68 connector nt connect converter rs485 to rs 232 converter rs 232 3.
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