Wireless UART for debug purposes

Il 15/11/2023 09:16, Peter Heitzer ha scritto:
> Hans-Bernhard Br&ouml;ker <HBBroeker@gmail.com> wrote:
>> Am 13.11.2023 um 09:10 schrieb pozz:
> 
>>> However, in some cases, the device is installed far from a PC and it's
>>> difficult to have USB wired cable connection.
> 
>> Define "far", and "UART"
> 
>> If the interface is actual RS232 of modest baudrate, it could be as
>> simple as: make the RS232 cable long, so the USB doesn't have to be.
> Or remote control a notebook connected to the devices UART via ssh or
> RDP (if you are using Windows).

As I said, the device is difficult to physically reach and it is often 
impossible to install a notebook near it.

Am 20.11.2023 um 08:29 schrieb pozz:
> Il 14/11/2023 19:47, Hans-Bernhard Bröker ha scritto:
>> Am 13.11.2023 um 09:10 schrieb pozz:
>>
>>> However, in some cases, the device is installed far from a PC and 
>>> it's difficult to have USB wired cable connection. 
>>
>> Define "far", 
> 
> 10-15 meters should be ok
> 
>> and "UART"
> 
> Standard TX and RX asynchronous signals as in RS232 standard, but at 
> UART low level voltages (3.3V or 5V). Baudrates that I often use are the 
> standard from 9600bps up to 115.2kbps.

Then you need an active device that shifts and boosts signal levels, a 
good deal closer to the machine in question.  A MAX232 equivalent in a 
box small enough to count as a plug casing would probably do it.

> The problem with a long cable is often the position of the device that 
> is uncomfortable to reach. 

"Uncomfortable" should only rule out doing that for use cases at or 
below the urgency of "nice-to-have."

Or, to put it differently: if you can't even get there with a suitable 
plug attached to some thin-ish cable, that puts the situation beyond 
"uncomfortable," into the realm of "practically impossible to use."