O/C Mastercard - P2 auxiliary connector

[nolatron]

anybody ever get the P2 connector on the master card to work?

I'm trying to use it to run some extra LEDs but the Mastercard doesn't seem be activating the outputs. I'm get 5v and ground on Pins 1 and 2, but when I activate all outputs using SIOC I don't get any voltage off pins 3-9.

Everything else on the card works fine. I'm just not sure why it's not turning on these 7 pins on the P2 connector.

[fordgt40]

Shaun

Sorry, works fine on my mastercards. Are you using the SIOC monitor function to turn them on - not controlador?.

David

[nolatron]

Yeah, using the SIOC Monitor. When I turn all outputs on, or just 49-55 individually I get no voltage off pins 3-9.

Pin 1 is pushing 5v and pin 2 is acting as a ground. So when I test 2+3, 2+4, 2+5, etc.. I get no voltage reading as if the output is not on.

:(

[fordgt40]

Saun

Sorry, but I cannot think of anything else that might help, assuming that all other inputs/outputs are working correctly and that you are getting 5 volts on pins 1&2 and that there is an external power supply connected

Regards

David

[Perik]

Saun

Works here as well.

Do Output 48 work?
That is the same IC (U3 - 74HC259) as Output 49-55.

I expect you have the numbering of the DB9 correctly ;)

[nolatron]

I actually have the last 8 outputs on the output card to connect tonight so I'll check that #48 soon as I get home to see if works too.

I'm pretty sure I have the pin numbering right. Pin 1 is top row left pin right and Pin 9 is bottom row right pin right as showin the Master Card manual.

7716

When I measure voltage on the top two left pins I get 5v, so I assume I got it all right :)

Thanks!

[nolatron]

Saun

Works here as well.

Do Output 48 work?
That is the same IC (U3 - 74HC259) as Output 49-55.

I expect you have the numbering of the DB9 correctly ;)


Tested output 48 and I get nothing from it. 11-47 work but 48 is dead along with 3-9 on P2.

[Perik]

Shaun,

Do you have the schematics (http://www.opencockpits.com/images/IOcards/iocard_master_64.pdf)and are you ready to do some conductivity testing.
First of all do a visual inspection and maybe re-soldering U3.
A few more options – either U3 need to be replaced or there are some broken traces
in the area. Use your Multimeter and test on IC legs - first of all +5V and GND
pin 16 and 8. Test against same pins on e.g. U4. Same goes for pin 1, 2, 3, 13 and 15.
Pin 14 connects to pin 7 on U1.

Happy findings;) and I'm sure you will succeed.

BTW - did you buy the IOcard ready built from OC?

[nolatron]

I don't know what I did but after taking the MC out to check continuity, now all the outputs on P2 won't turn off. Soon as I plug in either 5v or the USB cable to the expansion card, the LEDs light up. No response to SIOC Monitor.

Visually everything looks ok on the board. So bizarre.

And yes, I bought the board pre-built from O/C.

[nolatron]

So here's where we're at. This morning the board suddenly started pushing 5v to all P2 connectors this morning (but not output #48) soon as USB or 5v power is connected. I got 5v when testing ping 8 and 16 on u3, and 5v accross 16 and 1,2,3, 13 and 15.

However! Just now I put the board back and we're back to no power at all as we started. I do find when I test Pins 1 and 2 inside P2 I get 5v but when I test pins 8 and 16 on U3 I do NOT get 5v anymore. pin 6 and 18 on U4 do though.

[Perik]

Shaun,

While the board is disconnected from both USBMaster and External Power please
check that all pins on U3 have connectivity to where they should.
Use the Ohm-meter and test between U3 – pin 1, 2, 3, 8, 13, 15 & 16
and the same pins on U4 (1 to 1, 2 to 2. etc.). The last to test is U4 pin 14 to U1 pin 7.
Then add your External Power and measure that you have +5V between pin 16 and pin 8 (GND) on U3.
If all OK then add your Expansion and see what's happen.

BTW - Have you verified your DB25 cable between Master and Expansion?

[nolatron]

Just so I have the pin numbering right for U3 and U4;

When looking at the back of the mastercard with the P2 and DB25 ports facing up, Pin 1 would be top row furthest right and Pin 9 bottom row furthest right?

[nolatron]

EDITED:

Got it working. While really checking out the pins on the chips, I discovered a barely visible piece of solder bridging two pin on U3 between the chip and the P2 port. Once I broke that connection, everything is working perfectly now (so far).

Thanks Perik for all your help!

[Perik]

Great Shaun,

As I said - "I'm sure you will succeed"

I don't know how OC do their testing of pre-build cards but this is not good!!
and not the first time:(. Nice thing though about OC hardware is that you usually can
"walk" into the circuit board. That’s not the case on some of the new hardware
options where a Microscope is a must;).

Nice to able to give some "remote" help.