RE: [newtech-1] RJ11 to RS232(DB9) Cable

From: Calvin C.
Sent on: Wednesday, August 24, 2011 4:12 PM
When I was manufacturing Pocket PCs I only ever ran into two variations
for the RJ11 serial.  In the hardware world there's a lot of stuff that
will give you double takes like this.  Did you know USB also comes in a
pin-header version (and some enterprising companies are producing pin
header USB peripherals) and serial ports also come in a 10-pin variant,
etc.  There's a 1 wire "serial" etc.  MIDI ports, Apple IIc serial
ports, IBM PC/AT keyboard ports, pro audio cables--same exact cable. 'll
drive you nuts...

The whole business with the RJ11 I'm on the fence about.  Some
electronic engineer/hacker just thought it up one day, hacked it
together and fit a serial port where one wouldn't fit ordinarily (win)
but then created mass confusion (fail) as a result but nobody else
stepped up to the plate with a standard until Bluetooth showed up.

Calvin Chu
Senior Technology Licensing Officer, Columbia Technology Ventures
[address removed]
(212)[masked] (voice)
(212)[masked] (fax)
@cchu (twitter)

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-----Original Message-----
From: [address removed] [mailto:[address removed]] On Behalf Of hv
Sent: Wednesday, August 24,[masked]:21 AM
To: [address removed]
Subject: Re: [newtech-1] RJ11 to RS232(DB9) Cable

Wow. I am truly among the brain-dead today.

Sorry about that.

RJ-11 is 6-pin, not 4.

BTW, a quick googling of "serial cable rj11 db9"
doesn't seem to reveal a definitive cabling standard when going from
serial to RJ11; various vendors of different gadgets (serial port
multiplex hardware, PocketPC interfaces, emulators, bla bla ) seem to
have varying serial wiring assignments. But this was just a quick


On 08/24/[masked]:07 AM, hv wrote:
> It's not clear what you are trying to connect.
> RJ-11 is four conductor; typically, it's used to connect to the phone 
> system ("tip/ring" interface from Ma Bell).
> DB-9 is used /often/ for serial (RS-232) connections.
> It is a 9-conductor device.
> Are you looking for a cable for a 'standard' of some kind? Or is this 
> a 'custom' pin/wiring assignment?
> h
> On 08/24/[masked]:51 AM, Chris Vitale wrote:
>> I'm searching everywhere online.
>> Does anyone know of a good source where I can get an RJ11 to DB9
>> I dont want to use the rj11 to db9 adapter. Im trying to minimize 
>> signal loss.
>> CV

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