Timeout reading cylinder count!
Moderators: JeffC, rdoherty, stieg, brentp
Timeout reading cylinder count!
Just finished building V4 and connected to computer using direct serial link (not USB). Getting above fault "timeout reading cylinder count" any ideas? All voltages check out OK. Unit is powered by 9v battery at mo with nothing else connected. Battery voltage does drop down to 7.8 volts when connected.
Hello,
On the PC side, do you only have one built-in serial port, or are there multiple ports on your machine? Double check this in Windows Device Manager and make sure you're configuring the software to use the correct serial port.
On the MJLJ side, double-check your build process. you indicated your voltages are correct- that's good. We're also assuming the LED is shining brightly when power is applied?
* Verify the integrated circuits are installed in the proper orientation. Check U1, U2, IC1 and the oscillator (QG1) for proper orientation.
Use the image in this section as a reference.
http://www.autosportlabs.net/MJLJ_V4_ki ... alling_ICs
* Double check the solder joints across the board, and *especially* check the solder joints on the Processor chip (U1), the oscillator (QG1), the RS232 transceiver (U2), and the capacitors around U2 (C3,C4,C5,C6,C1). Problems here will affect your ability to communicate with the unit.
Backing up a bit: There are two ways to verify the MJLJ unit is "alive":
1. Can you communicate with the unit using your PC?
2. Can you observe it controlling ignition advance when installed on the engine?
For #2, the way to verify this is if you have an engine already running on EDIS. If you wire it in with the minimal required wires, you should be able to observe it controlling ignition advance with a timing light.
Minimal Wiring installation: http://www.autosportlabs.net/MJLJ_V4_ve ... _operation
Let us know what you find out on the above.
if you're unsure of the soldering and build process, posting some high-resolution images of the board, front and back, would be helpful.
Regards,
On the PC side, do you only have one built-in serial port, or are there multiple ports on your machine? Double check this in Windows Device Manager and make sure you're configuring the software to use the correct serial port.
On the MJLJ side, double-check your build process. you indicated your voltages are correct- that's good. We're also assuming the LED is shining brightly when power is applied?
* Verify the integrated circuits are installed in the proper orientation. Check U1, U2, IC1 and the oscillator (QG1) for proper orientation.
Use the image in this section as a reference.
http://www.autosportlabs.net/MJLJ_V4_ki ... alling_ICs
* Double check the solder joints across the board, and *especially* check the solder joints on the Processor chip (U1), the oscillator (QG1), the RS232 transceiver (U2), and the capacitors around U2 (C3,C4,C5,C6,C1). Problems here will affect your ability to communicate with the unit.
Backing up a bit: There are two ways to verify the MJLJ unit is "alive":
1. Can you communicate with the unit using your PC?
2. Can you observe it controlling ignition advance when installed on the engine?
For #2, the way to verify this is if you have an engine already running on EDIS. If you wire it in with the minimal required wires, you should be able to observe it controlling ignition advance with a timing light.
Minimal Wiring installation: http://www.autosportlabs.net/MJLJ_V4_ve ... _operation
Let us know what you find out on the above.
if you're unsure of the soldering and build process, posting some high-resolution images of the board, front and back, would be helpful.
Regards,