ioninja-hwc serialTap - inverted circuit

Hello again

One of the devices that we want to monitor has a TTL serial port, but with a strange customization. Its RX circuit is "regular", but the TX circuit is "inverted"... I do not know why... perhaps there is a real reason, perhaps they try to avoid use standard components...

Anyway, I am interested in capturing this communication using the SerialTap. I know (I did it before in lab) I could simply use an transistor in order to invert it, but this solucion is inconvenient when used in field (with real devices in operation), as we want that the setup that stands installed be clean and simple (and, eg, using the transitor solution, I have somehow to find a "5V Vcc")

I do not know it it would be possible to add an option in order to do this at "serialTap" level (eg. add an option to be able to consider some signals inverted, and apply some kind of "xor 1" over this circuits).

Regards!
Josep

Hello again, Josep,

Unfortunately, it's not feasible to add such a feature to the existing Serial Tap (which is based on a fixed-function dual-channel USB-to-TTL module from Cypress that doesn't support it natively).

But we can add this feature of level inversion for TTL to the upcoming FPGA-based Serial Tap Pro. It's about to be released very soon, actually (in a few months!) and will have many new features such as galvanic isolation of signals, high baud rates (up to 2Mbps), support for 9-bit UART, per-byte high-precision timestamps (1mcs), guarantee of correct sequencing for all events (TX/RX, status line changes, parity & framing errors, etc.), data injection, and more.

We're excited about this release, which will be a huge step forward compared to the current generation of Serial Tap!

Hello again. Ok! And thank you for the premier on the new HW, I look forward for having it available! It is good to know about its capabilities.
About my problem: ok, I was able to solve it with a simple inverter (mosfet) and I managed to get the Vcc I needed

If this is something you could add "for free" to your new development, great! If not, well, I think that this is no a common case, in fact, I found it very weird (but "real" indeed).

If this is something you could add "for free" to your new development, great! If not, well, I think that this is no a common case, in fact, I found it very weird (but "real" indeed).

Yes, it comes for free, so we'll have a setting for that!

Perfect. Thank you!