From: Johannes Wolf (mp2100_at_mail-gw.estec.esa.int)
Date: Mon Feb 07 2005 - 03:10:13 PST
Adriano,
With RS 232 there is always the question on who is connected with whom.
RS 232 differentiates between DTE and DCE.
PCs are considered as DTE and the SUB-D pinout known from literature refers
to that.
The point is that the transmitters on one end need to be connected to the
receivers on the other end and vice versa.
Depending on what device you connect, this is done within the equipment
already (e.g. modem devices) or you need a special cable or adaptor doing
the crossing between Rx and Tx lines (known as Null-modem cable or adaptor).
Since the BT adaptor is suposed to be plugged into the PC serial port
directly, it must have a pin-out matching the one of the computer in the
sense that all outputs on the PC side are wired to inputs on the adapter
side.
What you would need is kind of a 1:1 adaptor from mini-din (RS 422) to
sub-db 9.
This should look like this:
mini-din sub-db9
HsKo 1 4 DTR
HSKi 2 6 DSR
TxD- 3 3 TxD
GND 4 5 SG
RxD- 5 2 RxD
GND 4-
RxD+ 8-
connect 4 and 8
This should do the trick.
Cheers
Johannes
> -----Original Message-----
> From: newtontalk-bounce_at_newtontalk.net
> [mailto:newtontalk-bounce_at_newtontalk.net]On Behalf Of Adriano
> Sent: Friday, February 04, 2005 5:19 PM
> To: NTLK
> Subject: [NTLK] PICO bluetooth HW and Blunt 2
SNIP -------------------------------------------------------------------
SNIP -------------------------------------------------------------------
> I discovered that there should be two types of DB9 to Din8, where the
> first one got some pin inverted instead of the second.
> So the problem could be in my Mac adapter pin-out only. In a few days i
> will receive that second type to give a try.
> But i suspect that the consideration above about the adapter pin-out
> could be faulty.
> I know that the bluetooth chipset inside the Pico Plug is the same
> Ericsson ROK installed in PICO PCMCIA and i would comprehend if Blunt
> is simply not build to work on a PICO Plug, or if i really can use it
> on my MessagePad via serial connection.
>
> If Echkart could gently find the time to respond, i have a second
> question: will Blunt2 be bluetooth-printing enabled?
SNIP -------------------------------------------------------------------
> Thanks for adding comments
> Adriano
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