Transcript Serial Communications

Chabot College
ELEC 99.08
Hyperterminal Access to Routers
CISCO NETWORKING ACADEMY
What is Hyperterminal?
• A PC application installed on all Windows
machines that provides “terminal
emulation”
• It enables the PC to act like a terminal.
• So what is a terminal...
CISCO NETWORKING ACADEMY
What is a Terminal?
• User box
– Monitor
– Keyboard
– Serial port (connects to host)
• Has no:
– CPU
– Storage
– Operating system
CISCO NETWORKING ACADEMY
Input: 100-240VAC
Freq: 50.60 Hz
Current: 1.2-0.6A
Watts: 40W
AUI
AUI
SERIAL 0
SERIAL 1
CONSOLE
AUX
CISCO 2514
SD
PC Terminal Emulation
• PC with terminal
emulation software
– Hyperterminal
– WRQ Reflections
– etc.
CISCO NETWORKING ACADEMY
PC Terminal Emulation
• Console
connection:
– Serial
– Rollover cable
– Point to point
– Requires physical
access to
router
CISCO NETWORKING ACADEMY
COM1
Input: 100-240VAC
Freq: 50.60 Hz
Current: 1.2-0.6A
Watts: 40W
AUI
AUI
SERIAL 0
SERIAL 1
CONSOLE
AUX
CISCO 2514
con0
SD
PC Terminal Emulation
• Telnet
connection:
NIC
– via network
– Ethernet cable
– Shared,
multipoint
– Remote
access to router
CISCO NETWORKING ACADEMY
Input: 100-240VAC
Freq: 50.60 Hz
Current: 1.2-0.6A
Watts: 40W
AUI
AUI
SERIAL 0
SERIAL 1
CONSOLE
AUX
CISCO 2514
e0
SD
Serial Communications
• Data sent one bit at a time (serially)
• Wires for:
– Send
– Receive
– Signaling & flow-control (CTS, DTR, etc.)
• Many standards:
– EIA/TIA-232 (PC)
– V.35 (router)
CISCO NETWORKING ACADEMY
Serial Communications
• Terminal serial connectors
– DB25 (25 pin)
• PC serial connectors
– DB25
– DB9
CISCO NETWORKING ACADEMY
Serial Communications
• Cisco supplies RJ45 to DB adapters to
connect rollover cables to DB25 and DB9
CISCO NETWORKING ACADEMY
Serial Communications
• Serial devices connected point-to-point
must have matching settings:
– bits per second (baud rate)
– number of data bits
– parity
– number of stop bits
– flow control method
CISCO NETWORKING ACADEMY
Serial Communications
• Required settings for Cisco router con0:
– bits per second:9600
– data bits: 8
– parity: none
– stop bits: 2
– flow control: none
CISCO NETWORKING ACADEMY
Using Hyperterminal
• Start | Programs | Accessories |Communications | Hyperterminal
• When prompted, name your “connection”.
• In the “Connect To” dialog, from the “Connect Using:” list, select:
– TCP/IP Winsock for a telnet network connection to the router’s
vitual terminal ports. When prompted, specify
• the target router’s IP address.
– Direct to Com1 for a serial connection to the router console
port. When prompted, specify:
•
•
•
•
•
bits per second: 9600
data bits: 8
parity: none
stop bits: 2
flow control: none
• Press <return> or <enter> a few times to activate the connection.
•
(Try it!)
CISCO NETWORKING
ACADEMY
Standard Console Connections
CISCO NETWORKING ACADEMY
Our Lab Setup
Input: 100-240VAC
Freq: 50.60 Hz
Current: 1.2-0.6A
Watts: 40W
rtr-B
AUI
AUI
SERIAL 0
SERIAL 1
CONSOLE
AUX
CISCO 2514
rtr-A
Input: 100-240VAC
Freq: 50.60 Hz
Current: 1.2-0.6A
Watts: 40W
AUI
AUI
SERIAL 0
SERIAL 1
CONSOLE
SD
AUX
CISCO 2514
rollover
rollover
patch cable
straight-thru
PC-A
CISCO NETWORKING ACADEMY
terminal
PC-B
SD