Re: [OpenWrt-Devel] ttl to rs232 on wl500gp

[greg]

> I use the CA-42 clone cables, e.g.
> 
>

> 
> USD$3.89, with free shipping in the US (I actually get them in Australia
> for AUD$10 each).
> 
> They have a Prolific PL2303 chip inside the long blue USB connector.
> 


Likewise. I am using a CA-42 clone that I purchased from bargaincell.com,
via amazon.com for $.01 plus $2.98 shipping. It turned out that the local
distributor was within walking distance, in oakland - small world. :-)

I don't know about the ca-53 cable. I think that anything with the
super-long USB hood (containing a serial UART) can be made to work,
though you should check that it's 3.3v ttl and not 5v. A note on that -
measuring the supposed 3v3 TTL outputs on both my router and ca-42 cable
(unloaded) showed 5v on my digital scope. I haven't bothered to look at
it when they're loading each other.

Using linux, it's the pl2303 driver. The pl2303 driver that I apparently
had installed in my dell windows xp laptop had an issue - it was a
'Tripp Lite' by 'Prolific', old date. When my laptop went into standby,
the driver was not properly suspending/resuming, and I would have to
perform a hard reset. The prolific reference driver did not work with my
clone cable, but the driver distributed by belkin on their website for
the Belkin-badged usb-serial device works smashingly well across suspends.

On a side note, for anyone doing TTL interfacing - you should assume
you're going to be coupling grounds, ie, no isolation. My house does not
have ground on the circuit where my linux build machine resides (where
I first tried to use the CA-42 cable). My computer's chassis tends to
sit at a DC offset of 120V/2 = ~60V due to the switching power supply
within. Therefore, anything that the computer interfaces to will tend to
have a 60v DC potential. I had tried a tv tuner card in it, and ended up
getting a nice shock when touching both the chassis and the (disconnected
but with grounded shielding) coax line. What can I say? it's better than
licking a ringing phone line.

I saw such a large potential between the computer chassis and my asus
wl500gpv2 - of course, I didn't realize it at first, but only noticed that
I got a lot of garbage in the bit stream, and connecting the usb cable
to my linux box would cause the router to flip out and reboot. Hopefully
there's no permanent damage - it seems to work fine. I have similar
results when I plug my laptop into its charger and try to talk to the
router - they're on different circuits. I don't mind running off of
battery; I rarely need a serial console.

(I once spent some time tracking down a problem with a high bit error rate
in a prototype IS-95 CDMA system I helped to develop - it turned out that
the power supply for the RF transceiver board was on a different circuit
than the data acquisition board in the cPCI chassis, even though the
outlets were next to each other - there was a slight dc offset between
them that was causing clipping when sampling the baseband output. Shame
on us for calling chassis ground signal ground.)

-g



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Re: [OpenWrt-Devel] ttl to rs232 on wl500gp

[Gregers Petersen]

Rod Whitby wrote:

> I use the CA-42 clone cables, e.g.
> 
> 
> 
> USD$3.89, with free shipping in the US (I actually get them in Australia
> for AUD$10 each).
> 
> They have a Prolific PL2303 chip inside the long blue USB connector.
> 

Anybody knows if there is much difference between the nokia CA-42 and
CA-53 cables?

I recently got one of the later.

-- 
Gregers Petersen
People-stuff, layer 8 and anthropology
glp on irc

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Re: [OpenWrt-Devel] ttl to rs232 on wl500gp

[Markus Wigge]

Hi,

>> Mine was DKU5 cable for Nokia 6610, 3100, 3200, 5100, 6820, 7200
> 
> I use the CA-42 clone cables, e.g.
> 
> 
Siemens ME45 cables are fine as well... 2,49€ each + 2,49€ shipping.

http://cgi.ebay.de/USB-DATENKABEL-SIEMENS-M35-M35i-M50-ME45-ME45i-MT50_W0QQitemZ300292716408QQcmdZViewItemQQptZHandy_Zubeh%C3%B6r?hash=item300292716408&_trksid=p3286.c0.m14&_trkparms=72%3A1229|66%3A2|65%3A12|39%3A1|240%3A1318

Once I got them for 1€ each.

/Markus
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Re: [OpenWrt-Devel] ttl to rs232 on wl500gp

[Rod Whitby]

Stanislav Sinyagin wrote:
> you can find the details by googling out. Basically you buy the nokia USB 
> cable, 
> cut off the nokia plug and solder the wires. As a result you have 
> USB-to-serial adapter 
> with 3.3v on the wires. The standard USB/serial driver should recognize it 
> automatically.
> 
> Mine was DKU5 cable for Nokia 6610, 3100, 3200, 5100, 6820, 7200

I use the CA-42 clone cables, e.g.



USD$3.89, with free shipping in the US (I actually get them in Australia
for AUD$10 each).

They have a Prolific PL2303 chip inside the long blue USB connector.

-- Rod
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Re: [OpenWrt-Devel] ttl to rs232 on wl500gp

[Brian J. Murrell]

On Mon, 2009-02-09 at 08:32 -0800, Stanislav Sinyagin wrote:
> 
> here's more detail:
> http://buffalo.nas-central.org/index.php/Use_a_Nokia_Serial_Cable_on_an_ARM9_Linkstation

Sweet.  I wonder if I can find one of those around town relatively
cheaply.

Thanx!
b.



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Re: [OpenWrt-Devel] ttl to rs232 on wl500gp

[Stanislav Sinyagin]

- Original Message 
> From: Brian J. Murrell 

> The "nokia phone" cable is interesting in as much as you find those
> things in liquidation/discount stores sometimes.  I think my question
> was though, is that those have a USB end on them most of the time, yes?
> So you need to know that the chip that's in them doing the ttl/usb
> conversion has a driver for Linux, yes?  I guess most do in as much as
> somebody always wants their phone USB connection working.  :-)
> 
> With them all going bluetooth these days though, I suppose those cables
> are going out of style.  :-/

check out ebay.com in your local area. I found my DKU5 on ricardo.ch for 9.50 
Swiss francs, plus 3 Francs for postage.

Neither windows nor CentOS required any additional work, it was recognized 
immediately as a serial adapter.
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Re: [OpenWrt-Devel] ttl to rs232 on wl500gp

[Stanislav Sinyagin]

- Original Message 
> From: Brian J. Murrell 
> To: OpenWrt Development List 
> Sent: Monday, February 9, 2009 5:12:50 PM
> Subject: Re: [OpenWrt-Devel] ttl to rs232 on wl500gp
> 
> On Mon, 2009-02-09 at 08:08 -0800, Stanislav Sinyagin wrote:
> > as Michu already noted, a Nokia adaptor cable is available from local eBay 
> sellers
> > for $10-15. It is readily recognized by Windows (Vista) and Linux (CentOS) 
> without 
> > any hassle with the drivers.
> 
> So these are cables with a connector on one end that matches the nokia
> phone connector, yes, and what's on the other end?  An RS232 port?  Or a
> USB port?  If the latter, I am using a USB/serial driver to communicate
> with it?  These cables have the ttl/rs232 level conversion built into
> them?

you can find the details by googling out. Basically you buy the nokia USB 
cable, 
cut off the nokia plug and solder the wires. As a result you have USB-to-serial 
adapter 
with 3.3v on the wires. The standard USB/serial driver should recognize it 
automatically.

Mine was DKU5 cable for Nokia 6610, 3100, 3200, 5100, 6820, 7200

Some newer cables are basically USB-to-USB cables, so take care of the 
description.

here's more detail:
http://buffalo.nas-central.org/index.php/Use_a_Nokia_Serial_Cable_on_an_ARM9_Linkstation
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Re: [OpenWrt-Devel] ttl to rs232 on wl500gp

[Brian J. Murrell]

On Mon, 2009-02-09 at 17:22 +0100, marco wrote:
> 
> i would suggest an usb-uart cable (operating at 3.3v, based on the  
> ftdi chip).
> then just cut the uart end and solder some pin connectors
> (http://marco.blogs.teknusi.org/files/2009/02/p1010192.jpg to get an  
> idea)
> 

Yeah, somebody else suggested such a thing here earlier in this thread.
The one supply of those I could find would have ended up costing me 4x
what I got the ttl/rs232 adaptor I have on order for.

The "nokia phone" cable is interesting in as much as you find those
things in liquidation/discount stores sometimes.  I think my question
was though, is that those have a USB end on them most of the time, yes?
So you need to know that the chip that's in them doing the ttl/usb
conversion has a driver for Linux, yes?  I guess most do in as much as
somebody always wants their phone USB connection working.  :-)

With them all going bluetooth these days though, I suppose those cables
are going out of style.  :-/

b.



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Re: [OpenWrt-Devel] ttl to rs232 on wl500gp

[marco]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1


Il giorno 09/feb/09, alle ore 17:12, Brian J. Murrell ha scritto:
> So these are cables with a connector on one end that matches the nokia
> phone connector, yes, and what's on the other end?  An RS232 port?   
> Or a
> USB port?  If the latter, I am using a USB/serial driver to  
> communicate
> with it?  These cables have the ttl/rs232 level conversion built into
> them?

i would suggest an usb-uart cable (operating at 3.3v, based on the  
ftdi chip).
then just cut the uart end and solder some pin connectors
(http://marco.blogs.teknusi.org/files/2009/02/p1010192.jpg to get an  
idea)

marco

p.s. i got the cable from a local supplier, it costed about 15-20 euros
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Version: GnuPG v1.4.9 (Darwin)

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d/0AnRqPIfyd2M9Pl2hYe2yDJZxecnAX
=m893
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Re: [OpenWrt-Devel] ttl to rs232 on wl500gp

[Brian J. Murrell]

On Mon, 2009-02-09 at 08:08 -0800, Stanislav Sinyagin wrote:
> as Michu already noted, a Nokia adaptor cable is available from local eBay 
> sellers
> for $10-15. It is readily recognized by Windows (Vista) and Linux (CentOS) 
> without 
> any hassle with the drivers.

So these are cables with a connector on one end that matches the nokia
phone connector, yes, and what's on the other end?  An RS232 port?  Or a
USB port?  If the latter, I am using a USB/serial driver to communicate
with it?  These cables have the ttl/rs232 level conversion built into
them?

b.



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Re: [OpenWrt-Devel] ttl to rs232 on wl500gp

[Stanislav Sinyagin]

as Michu already noted, a Nokia adaptor cable is available from local eBay 
sellers
for $10-15. It is readily recognized by Windows (Vista) and Linux (CentOS) 
without 
any hassle with the drivers.



- Original Message 
> From: Brian J. Murrell 
> To: OpenWrt Development List 
> Sent: Monday, February 9, 2009 2:36:49 PM
> Subject: Re: [OpenWrt-Devel] ttl to rs232 on wl500gp
> 
> On Mon, 2009-02-09 at 11:30 -0200, Andres Aguirre wrote:
> > I have a question... Is not more easy to use a usb2serial adaptor?
> 
> It probably is.  It is more expensive though.  Following the previous
> links, the best option I could find was $35-40 by the time it was
> shipped to me.  The rs232/ttl converter was $11 shipped.
> 
> > I plan to do it, maybe there are some important reason to choose the
> > rs232/ttl alternative that I'm not taking in account.
> 
> Just cost I think.  Well, and not having to screw around with USB/serial
> device drivers.  That said, had I known about these USB/ttl adaptors and
> had I been able to get one at a reasonable price, I might have opted for
> that.
> 
> b.

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[OpenWrt-Devel] ttl to rs232 on wl500gp

[michu]

hey guys, just a small note, the cheapest way to add a serial port to  
your wl500gp is to use a nokia cell phone cable (~10$). you may even  
use an old palm pilot..

you may check:

http://neophob.com/serendipity/index.php?/archives/121-Reuse-your-old-Palm-as-Serial-Console.html

or

http://neophob.com/serendipity/index.php?/archives/120-TTL-to-Serial-for-dummies-OpenWRT-Serial-Console.html

cheers
michu

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Re: [OpenWrt-Devel] ttl to rs232 on wl500gp

[Andres Aguirre]

both are good reasons! I will take into account.
thanks

On Mon, Feb 9, 2009 at 11:36 AM, Brian J. Murrell  wrote:
> On Mon, 2009-02-09 at 11:30 -0200, Andres Aguirre wrote:
>> I have a question... Is not more easy to use a usb2serial adaptor?
>
> It probably is.  It is more expensive though.  Following the previous
> links, the best option I could find was $35-40 by the time it was
> shipped to me.  The rs232/ttl converter was $11 shipped.
>
>> I plan to do it, maybe there are some important reason to choose the
>> rs232/ttl alternative that I'm not taking in account.
>
> Just cost I think.  Well, and not having to screw around with USB/serial
> device drivers.  That said, had I known about these USB/ttl adaptors and
> had I been able to get one at a reasonable price, I might have opted for
> that.
>
> b.
>
>
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>



-- 
/\ndrés
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Re: [OpenWrt-Devel] ttl to rs232 on wl500gp

[Felipe Maya]

Maybe the voltage regulator LM1086 works better!!

I am using the LM7805 and it adds a few noise.

--
FMAY


On Mon, 2009-02-09 at 11:25 -0200, Felipe Maya wrote:
> You have to add the voltage regulator LM7805 to complete your circuit.
> 
> --
> FMAY
> 
> 
> On Mon, 2009-02-09 at 07:56 -0500, Brian J. Murrell wrote:
> > On Mon, 2009-02-09 at 08:14 -0200, Felipe Maya wrote:
> > > Follow the next link to do it. It works with ASUS, LINKSYS and etc.:
> > > 
> > > http://www.myopenrouter.com/article/10811/Hacking-Your-NETGEAR-WGR614L-How-To-Install-A-Serial-Port/
> > 
> > Yeah, I guess that might have been another way to go.  But my rs232/ttl
> > converter is already on it's way and it was half the price of those
> > ttl/usb cables, even if I do have to rummage through my power supply box
> > for a 5V supply, should I need it.  Would sure like to avoid the
> > external power need though, if I can.
> > 
> > b.
> > 
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Re: [OpenWrt-Devel] ttl to rs232 on wl500gp

[Brian J. Murrell]

On Mon, 2009-02-09 at 11:30 -0200, Andres Aguirre wrote:
> I have a question... Is not more easy to use a usb2serial adaptor?

It probably is.  It is more expensive though.  Following the previous
links, the best option I could find was $35-40 by the time it was
shipped to me.  The rs232/ttl converter was $11 shipped.

> I plan to do it, maybe there are some important reason to choose the
> rs232/ttl alternative that I'm not taking in account.

Just cost I think.  Well, and not having to screw around with USB/serial
device drivers.  That said, had I known about these USB/ttl adaptors and
had I been able to get one at a reasonable price, I might have opted for
that.

b.



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Re: [OpenWrt-Devel] ttl to rs232 on wl500gp

[Andres Aguirre]

I have a question... Is not more easy to use a usb2serial adaptor?
I plan to do it, maybe there are some important reason to choose the
rs232/ttl alternative that I'm not taking in account.
Thanks in advance
Andrés

On Mon, Feb 9, 2009 at 10:56 AM, Brian J. Murrell  wrote:
> On Mon, 2009-02-09 at 08:14 -0200, Felipe Maya wrote:
>> Follow the next link to do it. It works with ASUS, LINKSYS and etc.:
>>
>> http://www.myopenrouter.com/article/10811/Hacking-Your-NETGEAR-WGR614L-How-To-Install-A-Serial-Port/
>
> Yeah, I guess that might have been another way to go.  But my rs232/ttl
> converter is already on it's way and it was half the price of those
> ttl/usb cables, even if I do have to rummage through my power supply box
> for a 5V supply, should I need it.  Would sure like to avoid the
> external power need though, if I can.
>
> b.
>
>
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Re: [OpenWrt-Devel] ttl to rs232 on wl500gp

[Felipe Maya]

You have to add the voltage regulator LM7805 to complete your circuit.

--
FMAY


On Mon, 2009-02-09 at 07:56 -0500, Brian J. Murrell wrote:
> On Mon, 2009-02-09 at 08:14 -0200, Felipe Maya wrote:
> > Follow the next link to do it. It works with ASUS, LINKSYS and etc.:
> > 
> > http://www.myopenrouter.com/article/10811/Hacking-Your-NETGEAR-WGR614L-How-To-Install-A-Serial-Port/
> 
> Yeah, I guess that might have been another way to go.  But my rs232/ttl
> converter is already on it's way and it was half the price of those
> ttl/usb cables, even if I do have to rummage through my power supply box
> for a 5V supply, should I need it.  Would sure like to avoid the
> external power need though, if I can.
> 
> b.
> 
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Re: [OpenWrt-Devel] ttl to rs232 on wl500gp

[Brian J. Murrell]

On Mon, 2009-02-09 at 08:14 -0200, Felipe Maya wrote:
> Follow the next link to do it. It works with ASUS, LINKSYS and etc.:
> 
> http://www.myopenrouter.com/article/10811/Hacking-Your-NETGEAR-WGR614L-How-To-Install-A-Serial-Port/

Yeah, I guess that might have been another way to go.  But my rs232/ttl
converter is already on it's way and it was half the price of those
ttl/usb cables, even if I do have to rummage through my power supply box
for a 5V supply, should I need it.  Would sure like to avoid the
external power need though, if I can.

b.



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Re: [OpenWrt-Devel] ttl to rs232 on wl500gp

[Felipe Maya]

Follow the next link to do it. It works with ASUS, LINKSYS and etc.:

http://www.myopenrouter.com/article/10811/Hacking-Your-NETGEAR-WGR614L-How-To-Install-A-Serial-Port/


--
FMAY

On Sun, 2009-02-08 at 22:53 -0500, Brian J. Murrell wrote:
> OK.  So I need a serial console on my ASUS WL-500G Premium to debug this
> kexec problem I'm having.
> 
> Having a peek at
> http://wiki.openwrt.org/OpenWrtDocs/Hardware/Asus/WL500GP#head-8c0c5262c5a79f43d67037a30331937a6f7b8628
>  it says that the serial output is TTL level.  I have a TTL-to-RS232 
> converter on order which apparently uses the popular MAX232 chip for its 
> work.  This adaptor (http://fcpcb.ecrater.com/product.php?pid=1750384) 
> requires an external 3-5V (300 μA) external supply however.
> 
> I notice on the diagram for the serial connector at the first URL I
> pasted above that there is a "3.3V_OUT" available.  Is this intended to
> supply such a converter or is this for something else and I should still
> use an external power supply for the above converter?
> 
> I do notice in the photo
> (http://wiki.openwrt.org/OpenWrtDocs/Hardware/Asus/WL500GP/IMG_0007) on
> that page that the connector wired to that header is using that
> "3.3V_OUT" supply.  I wonder if he is using it to power such a
> converter.
> 
> Cheers,
> b.
> 
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Re: [OpenWrt-Devel] ttl to rs232 on wl500gp

[Brian J. Murrell]

On Mon, 2009-02-09 at 08:06 +0100, Dennis Bartsch wrote:
> Hello Brian,

Hi.

> I don't know whether this 3.3V output is intended to be used like that
> but it works.

I wonder how much current it really can deliver.

> I'm cusious whether 3.3V is enough to supply a MAX232 (or derivates)
> but is definately enough for a MAX3232 (or derivates), as I use it
> this way.

Hrm.  Yeah.  the datasheets on the MAX3232
(http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1068/t/al) and MAX232
(http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1798/t/al) show quite the
difference: 5V/3...@.03ma  vs. 5...@5ma.  Hrm.  Even thought the "Key
Specifications" for the MAX232 says 5V, the "Key Features" says "+3.0V
to +5.5V".

Does look like the MAX3232 is the better option.  Oh well, mine is
ordered at this point so no changing my mind.

Cheers,
b.



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Re: [OpenWrt-Devel] ttl to rs232 on wl500gp

[Dennis Bartsch]

Hello Brian,

> [...]
> I notice on the diagram for the serial connector at the first URL I
> pasted above that there is a "3.3V_OUT" available.  Is this intended to
> supply such a converter or is this for something else and I should still
> use an external power supply for the above converter?

I don't know whether this 3.3V output is intended to be used like that but it 
works.
I'm cusious whether 3.3V is enough to supply a MAX232 (or derivates) but is 
definately enough for a MAX3232 (or derivates), as I use it this way.

> Cheers,
> b.
> 

regards,
Dennis Bartsch

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[OpenWrt-Devel] ttl to rs232 on wl500gp

[Brian J. Murrell]

OK.  So I need a serial console on my ASUS WL-500G Premium to debug this
kexec problem I'm having.

Having a peek at
http://wiki.openwrt.org/OpenWrtDocs/Hardware/Asus/WL500GP#head-8c0c5262c5a79f43d67037a30331937a6f7b8628
 it says that the serial output is TTL level.  I have a TTL-to-RS232 converter 
on order which apparently uses the popular MAX232 chip for its work.  This 
adaptor (http://fcpcb.ecrater.com/product.php?pid=1750384) requires an external 
3-5V (300 μA) external supply however.

I notice on the diagram for the serial connector at the first URL I
pasted above that there is a "3.3V_OUT" available.  Is this intended to
supply such a converter or is this for something else and I should still
use an external power supply for the above converter?

I do notice in the photo
(http://wiki.openwrt.org/OpenWrtDocs/Hardware/Asus/WL500GP/IMG_0007) on
that page that the connector wired to that header is using that
"3.3V_OUT" supply.  I wonder if he is using it to power such a
converter.

Cheers,
b.



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