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Post Info TOPIC: how to test RhinoView and interface ?


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RE: how to test RhinoView and interface ?
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I got it going.  I'm using James's circuit with the BC846 but with a generic FTDI USB-2-serial lead + a Max232 to TTL board.

( the max232 inverts RX and TX)

1, the FT-prog util did not invert RX or TX until the FTDI chip us rebooted ( unplug/reconnect the USB lead).

2, You do get loop back with the R3 inserted. with nothing connected to the 2 wire SDL interface.

3, You don't get any RX led ( data) with out R3 inserted , while plugged into the car if the car is off.

4, it all worked with R3 removed , Rx and Tx inverted in the FTDI and the car Ign on.

 

Now to catch up to you all...

THANX James. !



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You can test the interface on the bench to check that it is operating at the baud rate specified RV will continuously request the ECU ID when you attempt to connect.

Bad data means that there was no repsonse from the ECU or that the data was corrupted. It was put in as a simple way of checking for the fastest practical polling rate .

Interfaces are in now, I built another batch yesterday.



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and many more.



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Thanx for the prompt reply.

I  am using RV and tested both baud rates, closing RV each time.

with and without R3.

Both the TX and RX go via a max232 driver ( inverting) thats between the ftdi dongle and the two 2.2k resistors from your SDL circuit.

Does an increment in BAD COMMS mean no reply or termination error or ?

I'm using common ground for the laptop ( on battery only), interface and car. The 5v for the interface and max232 is a 4.9 to 5.1v battery supply.

 

yes i have an old 100meg tectronics scope , but its mains grounded.. i'll see if i can get some clean pics.

 

looks like i'll order one of your interfaces when they come in..



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zukjeff wrote:

I have made the interface from this site ( 5 sept 2010) with the BC846 not the older one on this still on the site that has two fets.


 The schematic dated 5th Sep 2010 is the latest, what is the other circuit that you refer to?



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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine
2000 Suzuki Vitara 1.6 8V, many mods
2004 Suzuki Ignis 1.5VVT 4Grip
2006 Suzuki Jimny 1.3VVT JLX+
and many more.



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RX and TX must be inverted using MPROG

R3 is a pull up resistor, it isn't required but it can be left fitted. It was originally fitted to allow testing of the interface when it wasn't connected to an ECU.

TP6 is a via on my circuit board, the link connects between the board and the 0V pin which is on the upper row of pins on the connector, the lower row of pins is soldered directly to the board.

You usually need to use the USB port because the baud rate used by the ECU isn't supported by most serial ports, you get loopback on a terminal emulator but it may not be at the correct speed. With the Maxim chip you may only need to invert one pin you would need to check the datasheets.

Have you selected the correct speed for the ECU?

Do you have a scope to test the interface?



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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine
2000 Suzuki Vitara 1.6 8V, many mods
2004 Suzuki Ignis 1.5VVT 4Grip
2006 Suzuki Jimny 1.3VVT JLX+
and many more.



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I have made the interface from this site ( 5 sept 2010) with the BC846 not the older one on this still on the site that has two fets.

notes on the drawing say " invert rx and tx"  i assume this is using mprog or another FTDI util ?

It says R3 ( 4.7k) is for testing.

It also says connect TP6 to PL1 pin 5.

 

I can't find TP6 .

Is R3 just a serial loopback to  test the serial upto the two wire interface ?

If i use a term emulator in test mode i get loop back.

But anything i do in RV just counts up bad comms once per second or so.

i have tried the serial port and an ftdi rs232 dongle with inverted or non inverted rx/tx..

My hardware is via a max232 that inverts already.

hints please ?



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