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. Mike -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/2db3e797-1986-47c2-92f9-ec7d49209ac0%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
