i just finished building my MS2 vr. 3 PCB. I go to load the firmware...and i have no connectivity...
I try doing the connectivity test, i jumpered 12 to 13 went into hyperterm. and tried typing something in. I get no eco at all...
I Quadruple checked my set up and from what i can see everything is good.
Im stumped and need some help guys, any clues to going on????

Thanks
Jake

 

I'd start with the first few steps, double check for your power at each of the listed points. Make sure your getting power in the unit first.

 

i went and did the power circuit tests i have power on the 40pin connector. I also get 10v, -10v 5v, -5v at the max232 at the right locations.
When my megasquirt powers on and the leds flash, they only flash for a split seconded and they are not very bright. On my friends Megasquirt (MS1 Vr. 3pcb) they flash longer and brighter. I donno if this is a clue or not.
I went back and made sure i have everything installed right, diodes in the right direction ect. evrything checks out.
Also I did not install the hall effects stuff on the board.

 

Are you sure your connection cable is the right one. I remember reading something about a way to check the cable.

26. You now have enough to test the serial link. Do the following steps to verify operation:

1. Using an Ohmmeter, verify that your DB-9 serial cable is truly a pass-through and not a null modem. All DB connectors have the pin numbers molded into the plastic insulation around the pin holes on both male and female ends. The numbers are quite small and you may need a flashlight and magnifier to see them, but they are there. Check that pin 1 on one end is connected to pin 1 on the other end, then do the same check for pins 2, 3, 5 and 9.

If all these check out, you can proceed, otherwise you need to get a different cable. To repeat: On the cable, pins 2, 3, & 5 should all be connected and "straight-through".

Pins #1 and #9 have 5 volts on them; pin #1 has 5 volts because this is the standard serial specification (but not used with MegaSquirt), pin #9 has 5 Volts to power a bluetooth wireless device.

Pins 1, 2, 3, 5, & 9 are the only connected pins on the PCB.

The DB9 pin functions are:
* Pin 1 - VCC (5 volts)
* Pin 2 - Tx (OUT)
* Pin 3 - Rx (IN)
* Pin 5 - ground
* Pin 9 - 5 Volts (bluetooth device power supply)

 

make sure your cpu is not connected into the 40 pin socket. i had the same problem with hyperterminal and it was because the cpu was plugged into the socket. try 12 and 13 with the cpu out of socket and then check again

 

Make sure you have selected the COM port in Megatune that your MS will communicate with (most commonly COM1) and make sure you select the baud rate to 15200 for your MS2 firmware and test connectivity afterwards.

 

i do have the possessor removed, i tried different cables (including my friends that works on his MS1 Vr.3pcb), on different port settings. I do have the baud rate set right.

I has to be something the board....

 

ok now check pins 2 and 3 on the cable itself. jumper the two pins and try hyperterm like that. if it doesnt work then its the cable or the comm port setting is wrong. also double check your solder connections at the db9 connector. if it works then it might be the 232 chip. i had to change mine out because i accidentally shorted it. i hope that helps a little.

 

I have the usb to db9 adapter, if you are using that on some computers you have to dedicate that usb port to the device, the computer makes it a com port from that point on, depending on the brand. My brand also came with a driver.