ACC-14E, connector TB1

[christerEngblom]

Hello,
I am currently using the ACC-14E to interface with other TTL GPIO equipment and I have run into abit of a snag. It seems that the ACC-14E can't output enough power to keep 5V; it goes down to 3.4V when I plug in more than one output on the same DataRegister.

I could solve this by adding a electronic buffers to each and single output but that would require soldering which I would preferably avoid.

My question is, could I beef up the power output of the card? When I pull out the card I see an empty connector for GND and 5V (TB1)? Could I plug in an external 5V powersource into this?
I couldn't find anything in the documentation on the matter, but perhaps I missed something?

Best Regards,
Christer

[bradp]

What are the load characteristics of the devices you have connected to the ACC14E?

[christerEngblom]

they are at 10kohms

[akirao]

As outputs, each line is an open collector that can be pulled up externally to 5V, and is capable of sinking 10 mA while holding a standard TTL “low” output level.

Pin49 +V on J4 & J5 connector is internal +5V signal. I do not recommend you to apply external power to this pin.

[christerEngblom]

(02-11-2016, 02:04 PM)akirao Wrote: As outputs, each line is an open collector that can be pulled up externally to 5V, and is capable of sinking 10 mA while holding a standard TTL “low” output level.

Pin49 +V on J4 & J5 connector is internal +5V signal. I do not recommend you to apply external power to this pin.

ah, thanks for the response on the matter! I was hoping to avoid additional modifications on the cabling between the device and the ACC-14E but maybe it is unavoidable.

The TB1 connector (GND and 5V, unconnected) is however on the card and not (seemingly) connected to J4 & J5. This should always remain unconnected?

Best Regards,
Christer