Ynt: [opendiag] Re: Any bidirectional OBD-II interfact available or buildable?

Hello

i believe you are confusing the 'bidirectional' and 'Full Duplex' communication.
all protocol are bidirectional but non is full-duplex. it is because you must wait for High level on K-Bus or for low on J1850 or for silence on Can Bus
if a tester is not bidirectional you can not use a such scanner :-)) or they mean not full-duplex ( receiving data while transmitting.)
normally all the scanner are in fact bidirectional same if the manufacturermeans it is not .

B/R

Bülent

----- Original Message -----
From: amendelsohn
To: opendiag@yahoogroups.com
Sent: Friday, February 20, 2004 3:34 AM
Subject: [opendiag] Re: Any bidirectional OBD-II interfact available or buildable?

Hi,
I'm sorry if my question is confusing. I gather that OBD-II
communication is bi-directional. I'm referring the
"bi-directional" in the way that at least one of the commericial
scanner companies do: For example, Autoxray explains in their FAQ
that their scanners are not capable of getting bidirectional data:
http://www.autoxray.com/footer/faq.aspx 5th question from the top

What they seem to mean is the ability to query a particular sensor and
then get readings from it.. I have found that most of the software can
read oxygen sensors, but most cannot read the pressure control
solenoid that I mentioned.

I guess I am asking the ability to read various non O2 sensors.

--- In opendiag@yahoogroups.com, "Nick" <ecu@c...> wrote:
> Hi,
>
> I'm not quite sure what you mean - all the interfaces are
> bidirectional, as you need to send commands to the ECU which
> the ECU responds to.
>
> Do you mean some form of duplex mode?
>
> Cheers,
> Nick.

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Received on Sat Feb 21 04:29:29 2004