SimOne RS232 cable schematic
nuccio raciti
the right cable schematic is:
RJ45(MALE) DB9 (FEMALE)
RTS 1 8 CTS
DTR 2 6 DSR
TX 3 2 RX
GND 4 5 GND
GND 5 5 GND
RX 6 3 TX
DSR 7 4 DTR
CTS 8 7 RTS
Sergio told me that whoever needs it can write to him privately,
in any case the fix that I proposed here:
http://sim1.googlegroups.com/web/SimOne+RS232+Cable.JPG
works fine.
Ciao,
Nuccio
sergio.sorrenti
we made a mistake wiring the RS232 cables...
Pls observe this new pinout from Nuccio to make
a new RS232 cable for Sim.One
or to repatch the old one.
Who don't have an Ethernet Crimper,
or don't have the time to do it
and need a new cable, pls write to me privately,
i'll ship one by priority post together with an
useful (i hope) MicroSD HC reader.
Now we are working for a Fix
of the USB Disconnect problem.
Pls wait for more news...
Sergio
Yann E. MORIN
On Dec 4, 10:51 am, nuccio raciti <raciti.nuc...@gmail.com> wrote:
> RJ45(MALE) DB9 (FEMALE)
>
> RTS 1 8 CTS
> DTR 2 6 DSR
> TX 3 2 RX
> GND 4 5 GND
> GND 5 5 GND
> RX 6 3 TX
> DSR 7 4 DTR
> CTS 8 7 RTS
RJ45. I've tried to trace the tracks on the layout, and I think I made
out pin-8 to the one closest to the power socket, which would imply
pin-1 is the one closest to the ethernet port. Is that right?
OK. I tried to severe the cable as per your example, and I can see the
console now! :-)
Unfortunately, I may have severed the cable a little bit too much , as
the Sim.One does not receive any input. I will check when I have my
new cable build (will get the tools tomorrow).
Regards,
Yann E. MORIN.
sergio.sorrenti
> I'm doing another cable, but I am unsure which pin is pin-1 on the
> RJ45.
http://upload.wikimedia.org/wikipedia/commons/b/b5/RJ45.svg
Sergio
Yann E. MORIN
On Monday 07 December 2009 21:47:50 sergio.sorrenti wrote:
> > I'm doing another cable, but I am unsure which pin is pin-1 on the
> > RJ45.
I was bit skeptical about my own understanding on the wiring. My first
interrogation was about the RJ45 wiring: is TX on the RJ45 to be
interpreted as "TX from sim.one", or "connect to TX on PC side". Yeah,
the question sounds stupid, and I may pass for a noob, but I found the
answer neither on the schematics, nor on the wiki (maybe I missed it
somehow).
My second interrogation was wether all of the DTR/CTS/RTS/... stuff was
realy required. In my (humble) experience, I always used only a three-wire
serial cable, and all was always OK.
So, I made my cable (took a bit of a time, I am a bit clumsy), and wanted
to print it black-on-white, so others will find the answer. So:
- TX on the Sim.One side means "TX from Sim.One" and we need a so-called
NULL-modem cable, not a straight one
- only TX/RX and GND are required
- I used a standard 8-wire Cat5e cable
- I used a different wire for each of the GND signals on the RJ45, this is
supposed to offer better noise isolation (but at 57600, who cares?)
- those two wires got tied together to the single GND signal on the DB9
- I used a DB9 with a cover and a 'blocker' to relieve the soldering from
any strain (traction & bending) applied to the cable
RJ45, Sim.One side
Pin# Signal name Cable colour
1 RTS brown
2 DTR brown/white
3 TX green
4 GND green/white
5 GND blue
6 RX blue/white
7 DSR orange
8 CTS orange/white
DB9, PC side
Pin# Signal name Cable colour
1 DCD N/C
2 RX green
3 TX blue/white
4 DTR N/C
5 GND green/white + blue
6 DSR N/C
7 RTS N/C
8 CTS N/C
9 RI N/C
Briefly, it is:
RJ45 DB9
3 <---> 2
6 <---> 3
4 <---> 5
5 <---> 5
The signals are N/C (not connected) on the DB9 side, as it is much easier
to solder/de-solder on the DB9, than it is to add/remove a wire in an RJ45!
Of course, change the colours accordingly to how you fit the wires in your
RJ45 connector! :-)
Hope this will be helpfull to anyone.
Regards,
Yann E. MORIN.
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