HSEROUT question

[cncmachineguy]

For your board to talk to the device, you will need to stop using the FTDI converter. you have interface incompatibilities here.

As I understand it, this is you setup:
PIC ->non-inverted serial->FTDI->usb->PC (with virtual com driver prolly)
Other device->true serial->USB adaptor->PC (with virtual com driver prolly)

Just connecting the USB to USB will not work.
connecting non-inverted serial <->true serial will not work

I see 2 choices:

Add a level converter (MAX232) to the PIC serial then connect that to the other device true serial
or
Use 2 new pins and SERIN/SEROUT so you can make true serial data without the converter. I think this should work unless the other device needs RS232 levels (-12 to 12 V). In that case you will have to use a MAX or simular converter.

[Hylan]

Bert you are correct in your description. I was wondering if the FTDI chip was causing a problem. I had posed that question to the audio device tech group and hadn't gotten an answer yet. When I plug my device into a computer, it has to load the drivers in order to function. However, with the audio device, it has no way to do this.

I'll check my schematics and board layout and see if I have another pair of pins I can output to or if I can tap into the trace at a via before the FTDI chip to get the raw signal.

Thank you,
Hylan

[Hylan]

Update: unfortunately not a good one.

I have two versions of my hardware, one of which actually has direct pic to pin access. I used this board to bypass the USB chip and try to go directly to the other audio device with no luck. My device is already in production and this is just a single variant I'm trying to create for a single test, so changing the board is not an option.

I haven't fully given up but am close. This seemed simple in concept but has proven otherwise. I'm currently looking into a small linux based single app computer that could basically function as a host just to capture and pass the signals betweent the two devices using a java program.