RE: [uCsimm] Pinouts for serial cable & Orientation of Red Tantal um

Date: Mon Jul 30 2001 - 11:41:41 EDT

Reading the message below, I would have expected pins 2,3 and 5 to be the
serial port pins on my uCgardener. All of my serial cables are wired as

However, I am having to use pins 1, 3 and 4 (1 is GND).

Can someone explain this? The only explanation I could come up with is that
I installed the 9 way male connector on the wrong side of the board, but I
installed it on the "top", just like it is in the photos shown in the
uClinux handbook!

It isn't a problem now that I know, but it took me a while to figure it out
- I thought that I had a dead module. Instead, I now have a "special"
uCgardener serial cable.

As for the orientation of that red tantalum... I have serious words about
that.... the writing on the cap DOES NOT FACE THE CENTER OF THE PCB. It
faces the DB9; away from the uCsimm socket; away from the center of the pcb,
in my opinion. It neither faces the RJ45 nor vice versa because it is
perpendicular to it. Luckily I have a hardware engineer to hand or I could
have been in trouble.

Lineo, please update the documentation that comes with the uCgardener!!!!

On an happy note, thanks to the help I have been given here, I have my
uCsimm & gardener up and running. The packages are all installed on my PC
and I am now the proud user of uClinux on a real embedded target.


>Are you using the uCgardener?
>DB9 pin 2 is RSTXD and pin 3 is RSTXD. pin 5 is GND
>Which allows a straight through DB9 --- DB9 cable to connect to the Serial
>Port on a Linux PC (is there another kind?).

>> -----Original Message-----
>> From: Terry Carlin []
>> Sent: Friday, May 12, 2000 12:41 PM
>> To:
>> Subject: [uCsimm] Pinouts for serial cable
>> Looking for the pinouts to hook up the uCsimm to a linux serial port. db9

>> to db9.
>> Thanks
>> Terry Carlin


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