Rs 422 Cable Pinout

Pins 1 2 6 and 8 are inputs.

Rs 422 cable pinout.

A device with an rs 485 or rs 422 port might include a built in termination resistance you can connect to a bus if needed or leave disconnected. How far will rs422 485 communicate. Keep in mind the longest run. Rs 422 also known as tia eia 422 is a technical standard originated by the electronic industries alliance that specifies electrical characteristics of a digital signaling circuit.

Db25 signal db9 definition 1 protective ground 2 txd 3 transmitted data 3 rxd 2 received data. Rs 422 cannot implement a truly multi point communications network such as with eia 485 however one driver can be connected to up to ten receivers. Maximum data rates are 10 mbit s at 12 m or 100 kbit s at 1200 m. Rs422 serial port connector pin layout.

Usb to rs422 serial converter cable datasheet version 1 3 document reference no. Rs 422 systems can transmit data at rates as high as 10. These connections can be seen in red below figure 2 for rs 232 and figure 3 for rs 422 485. On an rs 232 connector pins 3 4 and 7 are outputs.

Ftdi 74 1 description the usb rs422 cable is a usb to rs422 levels serial uart converter cable incorporating ftdi s ft232rq usb to serial uart interface ic device which handles all the usb signalling and protocols. Unlike rs 232 rs 422 is capable of data transmissions over long distances up to 4000 feet. The pinout for rs 232 crossover cable wiring and can be used when creating a custom cable. Pinout of rs 422 9 pin and layout of 9 pin d sub female connector.

Sony rs 422 db9 pinout. Rs232 pinout rs232 pinout standards exist for both db9 and db25 connectors as shown below. Pinout diagram for de 9 connector to perform a loopback test with no hardware flow control you will need to connect pins 2 and 3 for rs 232 and pins 4 to 8 and 5 to 9 for rs 422 485. Typically twisted pair wire has an impedance of about 120 ohms so we use 120 ohm resistors at the ends on the longest cable runs.

It has been widely used for decades. Rs 422 termination on pin 4 of the connector with the rs 232 signals. So according to the wiki there indeed is no standard for the pin assignments of rs 422 on a db 9 connector. The diagrams below show how sony s rs 422 db9 connector is used for serial communications.

Note that pins 1 and 6 are tied together on both sides of a. Use only two terminating resistors. In a standard null modem cable.