+ Ĭables and adapters required (based on console port RJ45 pinout)

Serial RS232 port-to-port connection typesĬables and adapters required (based on EIA/TIA-561 RJ45 pinout) If devices require Carrier Detect (CD), it can be simulated by connecting Data Set Ready (DSR) and Data Carrier Detect (DCD) internally in the connector, thus obtaining CD from the remote Data Terminal Ready (DTR) signal. Signal flow is in the direction of the arrows. The signal names match each other and connect pin for pin. The output signals on a DTE port are inputs to a DCE port, and output signals on a DCE port are inputs to a DTE port. They have the same signal names and PINs, but the signal flow is the opposite.

RS-232 ports are of two types: Data Terminal Equipment (DTE) and Data Circuit Terminating Equipment (DCE). Most Cisco routers natively support EIA/TIA RS-232 serial connections.

RS-485 interfaces need only two wires for half-duplex communication. RS-485 interfaces support a multidrop, multimaster serial bus, which is an improvement over RS-422 interfaces. At reduced speed, it can operate at distances up to 1200 meters (0.75 mile). It can also be used for data rates up to 10 Mbps. RS-422 also supports multidrop, enabling multiple RS-422 devices to be connected on a single interface. At reduced speed, they can operate at distances up to 1500 meters (0.9 mile). RS-422 interfaces allow data rates up to 10 Mbps. It was intended to be a replacement for RS-232C. It offers much better speed and noise immunity, as well as longer cable length. It comes in different physical layouts, including RJ45, DB9, and DB25. The maximum data rates on RS-232 can reach up to 20 Kbps. RS-232 is by far the most popular interface used on devices such as PC COM ports as well as networking, consumer, and industrial devices for distances up to 15 meters (50 feet).

Mini-USB or RJ45 – RS-232 with Cisco proprietary console pinoutĬommonly used asynchronous serial interfaces are of three types: EIA/TIA RS-232, RS-422, and RS-485.

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