Rj45 To Db9 Null Modem Cable Pinout

Used for a console connection between a pc and cisco devices.

Rj45 to db9 null modem cable pinout. There are multiple pinouts for rj45 connectors including straight through t568a or t568b crossover rolled t1 and loopback. Serial rs232 null modem cable db9 db25. Use this cable between two dte data terminal equipment devices for instance two computers. This is in response to a number of recent emails asking how to wire both ends of a db9 connection using cat5 cat5 e or cat6 cable.

Also please note that it is very important that a single pair be used for pins 3 and 6. Rs232 db9 null modem pinout on cat5 cat5 e cat6. The pinouts for wti rj45 console ports and db9 console ports are shown below. Note this adapter has female db9 with a null modem pin out configuration.

Pinout and signals for building a serial rs232 nullmodem cable. We have shown a null modem back to back pcs only configuration. 72 3383 01 cisco rollover console cable blue db9 to rj45 6 foot. A rj45 connector is a modular 8 position 8 pin connector used for terminating cat5e or cat6 twisted pair cable.

You ll observe that our crossover shell needs to have rj45 pins 1 and 2 connected to db9 pin 4 and rj45 pin 3 connected to db9 pins 6 and 1. The cisco 72 3383 01 console cable is the same cable that ships with cisco switches firewalls routers wireless devices and etc. To achieve this the most obvious connection is that the td signal of one device must be connected to the rd input of the other device and. The purpose of a null modem cable is to permit two rs 232 dte devices to communicate with each other without modems or other communication devices i e dce s between them.

Null modem cable db9 db9. Only use one null modem adapter per cable as using two will un null it yielding a straight through instead. Null modem cable pinouts. Pinout and signals for building a serial rs232 nullmodem cable.

This must not be confused with db9 to rj45 rs232d. Each connector shell comes with the eight rj45 pins already wired to a separate db9 pin which you can push into any of the provided db9 connector holes. Use this cable between two dte devices for instance two computers. Because only two pairs of wires in the eight pin rj 45 connector are used to carry ethernet signals and both 10base t and 100base tx use the same pins a crossover cable made for one will also work with the other.