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Cisco - Connecting a Terminal to the Console Port on Catalyst Switches

Console Port Mode 2 Signaling and Pinouts

This section provides the signaling and pinouts for the console port in mode 2 (port mode switch in the

"out" position). See

Table I-4

straight-through cable to connect a terminal.

Table I-4: Console Port Pinouts (Port Mode Switch Out)

Console Port

Pin (signal)

1 (RTS)¹

2 (DTR)

3 (RxD)

4 (GND)

5 (GND)

6 (TxD)

7 (DSR)

8 (CTS)¹

¹Pin 1 is connected internally to Pin 8.

Catalyst 8510CSR, and 8540CSR Switches Console

Port Pinouts

The console port on the route processor is an EIA/TIA-232, data communications equipment (DCE),

DB-25 receptacle. 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. The console port requires a

straight-through EIA/TIA-232 cable.

Table J-1: DB-25 Console Port Pinouts

Signal Direction Description

GND

TxD

RxD

RTS

CTS

DSR

http://www.cisco.com/warp/public/473/9.html (18 of 19) [9/4/2003 12:36:03 PM]

for the pinouts. Mode 2 gives you the option of using a standard RJ-45

Console Device

Input/Output

Output

Input

GND

Output

Input

Table J-1

lists the console port pinouts.

Ground

Transmit Data

Receive Data

Ready To Send¹

Clear To Send¹

Data Set Ready (always on)²