Cisco Catalyst 2810 Series Manual page 6

Cisco - Connecting a Terminal to the Console Port on Catalyst Switches
The Supervisor Engine console port is a data communications equipment (DCE) DB-25 receptacle that
supports a DCE EIA/TIA-232 interface. EIA/TIA-232 supports unbalanced circuits at signal speeds up to
64 kbps.
Before connecting the console port, check the terminal documentation to determine the baud rate. The
baud rate of the terminal must match the default baud rate (9600 bps) of the switch console port. Set up
the terminal as follows:
9600 BPS
8 data bits
No parity
1 stop bit
Use a straight-through cable to connect the switch to a data terminal equipment (DTE) device, such as a
terminal or a PC. Use a null-modem cable to connect the switch to a remote DCE device, such as a
modem or a Data Service Unit (DSU). See the figure below for DCE and DTE cable connectors.
Figure: EIA/TIA-232 Adapter Cable Connectors, Network End
Note: The console port is an asynchronous (Async) serial port; any device connected to this port must be
capable of asynchronous transmission.
Both Data Set Ready (DSR) and Data Carrier Detect (DCD) are active when the system is running. The
Request To Send (RTS) signal tracks the state of the Clear To Send (CTS) input. The console port does
not support modem control or hardware flow control.
Table C-1: Catalyst 2926 Series Console Port Pinouts
Pin Signal Direction
1 GND
2 RxD >
3 TxD <
4 CTS <
5 RTS >
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Description
Ground
Receive Data
Transmit Data
Clear To Send
Return To Send
Table C-1 lists the console port pinouts.