cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
961
Views
0
Helpful
5
Replies
jmar83
Beginner

What kind of cable (crossed/uncrossed) and which RS232 parameters for Cisco Linksys SRW2024 Switch?

Hi there!

What kind of cable (crossed/uncrossed) and which RS232 parameters do i need for the Cisco Linksys SRW2024 Switch?

https://serverfault.com/questions/299457/what-serial-cable-do-i-need-for-a-cisco-linksys-srw2024p


Is it correct that there are different HW revisions of that switch are existing, and some of them need crossed RS232 cables, other ones not? (Same thing with RS232 connection paraemters: 9600, 38400, 115200 bauds ... ? Flow control hardware of no flow control? Etcp. pp...)

On the backside of the device, i read v1.3

If you need more information, so please don't hestitate to ask me for them.

Thank you very much.


With best regards from Switzerland,

Jan

5 REPLIES 5
JoshuaWatson
Beginner

Hello,

Do I need a null modem cable or simply a straight-through serial cable (with a female end on the side to connect to SRW2024)? Is it actually possible to build a straight-through RS232 M-F?
I haven't found any solutions on the community forum.

 

 

 

 

Joshua Watson

community.cisco.com/t5/switching/cisco-srw2024-info-needed-pls cheapessaywriter.co.uk

jmar83
Beginner

Nobody knows...

That question seems to be to complex for that forum...

Joseph W. Doherty
Hall of Fame Expert

To know what kind of cable you need, you need to know whether the device's RS-232 port is wired for DTE or DCE.  DTE<>DCE use straight through while "same kind" plug types need cross over.

A PC's RS-232 plug should be wired as a DTE.  I think (?) Cisco routers' RS-232 plugs were generally wired at DTE too.

As far as I know, Cisco defaults their RS-232 ports to 9600 baud, 8 data bits, (usually) 1 stop bit (some Cisco devices may use 2), no parity and no flow control.  Of course, someone before you may have changed the defaults and not reset them.  The most common change is an increased baud rate (maximum rate also varies between devices).

acampbell
Advocate

Hi,

Look here:-
https://www.cisco.com/c/dam/en/us/td/docs/switches/lan/csbms/srw248g4p/administration/guide/SRW248G4P_ug.pdf

Chapter 4

Bits per Second: 38400
Databits: 8
Parity: None
Stop bits: 1
Flow control: None

According to what I see it shows the console on the switch as a 9 pin "D" female.
That usually infers a DCE. but says it uses

CONSOLE The Switch is equipped with a
serial port labeled Console (located on the
back of the switch) that allows you to connect
to a computer’s serial port (for configuration
purposes) using the provided serial cable. You
can use HyperTerminal to manage the Switch
using the console port.

Your PC will usually be DTE (Male) 9 pin "D" now-a-days

I think you you need a straight

2 -- 2
3 -- 3
5 -- 5

If that fails try crossing 2--3 & 3---2

Worth a go anyway.
All the best.

 

Regards, Alex. Please rate useful posts.