On 2/25/2019 10:53 AM, Mike Brandon wrote:
Hi,
TL;DR: What kind of signal is transmitted straight out of UART TX?
I am beating my head against a wall with a circuit I have been
designing related to UART. I know my app works as I can use a
USB-to-Serial adapter connected to beaglebone's USB0 and my app
performs as expected. When I attempt to use UART4, via a MAX3232 chip,
the app does not communicate as expected. Prior to placing the MAX3232
chip in my circuit, I remember having unsuccessful attempts with my
app as well, leading me to believe that I needed to convert the signal
coming out of the UART with the 3232 chip.
The device I am communicating with also has a 3232 chip onboard that
my signal is going through. I a thinking I am misunderstanding the
signal being produced by the UART4. I know I have at some point
confused what results I was obtaining when I had the circuit
breadboarded and was testing things out. So I think I am just needing
to start fresh and do some better documenting of my tests going forward.
However, at this current point in time, I do know my MAX3232 circuit
works as I have tested by looping the RX/TX lines on the other side
and I can send/receive in minicom on the BBB. I also communicated with
another PC via the circuit successfully. In that setup, the BBB was
sending through the MAX3232 which the RX/TX output was connected to a
USB-to-serial adapter that was connected via USB to a windows PC.
I have also a better documented thread of the issue here, for
reference: https://forum.allaboutcircuits.com/threads/max3232-to-max3232.156598/
At this point, looking at my circuit and the device I am attempting to
communicate with, I believe I am sending a TTL signal to the device
connection which is expecting a RS232 signal.
Mainly I am just trying to understand what kind of signal is
transmitting out of the UART TX, is it TTL or RS232? I did look at the
BBB system ref. manual but did not see data related to this.
3.3v ttl
Mike
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