All kinds of loggin/connectin/ecu problems

[Mikael SS]

Car is a 91 GSX.

The stock eprom ecu was stolen. Thank you to that a hole. I bought an eprom ecu, didn't test it, and put my own socket in it. Cannot get DSMLink to connect. I got DSMLink second hand, and the cable required a gender changer to work with a serial port. This made the cable suspect.

I had a spare non-eprom ecu laying around, the car runs with it, and the scanmaster works fine. I tried the cable i had with this ecu and two different logging programs. Got nothing.

Made my own cable, shown here:

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Same thing, no connection.

I've also tried different laptops, different USB to Serial Adapters, i even ran a 50ft wire to a desktop in my office with a built in serial port.

What am i doing wrong, what am i missing?

Now that i'm home, i realize that the Scanmaster has an output, can i just use that as my dsmlink cable?

 

[Mikael SS]

See its so bad i can't even spell things correctly

 

[steve]

Are you trying to make a PC or Palm cable?
Where is what looks like the white wire from the DLC connector. It should go where the green wire is.
The standard 1G passive cable won't work to connect to DSMLink.

 

[Mikael SS]

PC.

The white wire is data, which goes to the green wire on the other end. I talked to a person with DSMLink and they don't know where the cable i got is from, but they will sell me a replacement one.

I guess i learned my lesson, don't buy expensive things used from the classifieds.

 

[steve]

The white wire is data, which goes to the green wire on the other end.

, I know that the white wire is connected to the data pin on the DLC connector. I can also see the black wire connected to the mode pin but I can't see the wire going to ground. What it is. Sometimes these two pins and connected together at the DLC end and other times it's three wires back to the DB9 end so the logic can control it.

If your connector is a female then your DB9 end is a little messed up.

I see this all the time with connectors, people forget that the order of the pins swaps depending on if the connector is male or female and that the pins are numbered looking at the back where the wires attach.

For a PC the connector is going to be a female connector on the cable and looking the it from the back the pins are numbered 1 to 5 left to right on the top and 6 to 9 left to right on the bottom. (On a male connector to connect to a Palm hotsync cable the order is reversed 5 to 1 on the top left to right, 9 to 6 on the bottom left to right)

The other issue is which pins are used to transmit and receive data. RS232 defines two interfaces DCE and DTE. A DTE transmits on pin 3 and receives on pin 2. A DCE swaps them. This impacts the schematic for the two cables.

The simple passive interface for a PC:

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The simple passive interface for a Palm PDA:

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Notice how the pins change for TXD and RXD. This is in addition to where the pins are on the connectors.

DSMLink for a 1G uses a little more involved cable. There are actually two versions of the 1G adaptor. The original looks like it was an active design.