ESP8266 Community Forum

- Sat May 16, 2015 3:48 am #17537

You are correct of course, it is old fashioned. That is why I wonder why (some) big name new radios are only equipped with TTL level comms. You can of course buy a USB to radio "programming lead" or build one, which is what most hams do.
I am trying to avoid either removing the radio from the car, taking a laptop to the car, or running a long cable to the car every time I want to reprogram the radio's memory channels.

Most, if not all, devices use some form of shifting internally by using a RS232 IC (eg. the above mentioned MAX232). Just bypassing this chip allows you to connect the ESP directly to the TTL/CMOS logic of the device, no need to do this shifting yourself. This is probably not the case for real legacy devices, but for your radio it should work this way.

- Sat May 16, 2015 6:27 am #17547 I some cases I'd prefer to keep the level shifters though, because they make a much more "hard" interface, less chance of static electricity, overvoltage, etc.

- Sat May 16, 2015 6:51 am #17550 Thanks for your input.
My radio's serial (data) port is already the, but most of the legacy gear is not. I will have a look at bypassing the internal level shif device while keeping in mind the protection aspect as well.
Cheers!
All of this is pointless unless I can work out what I am doing wrong.
Is it possible to see the configuration info (from telnet) for a setup that is working?
I think I have tried everything but obviously not....

- Sat May 16, 2015 7:22 am #17551 Can you compile and flash firmware yourself or not? If you can I'd say try my version with static config.