I use four independent RS232 Tranceiver on a new pcb design and have a lot of errors during transmit. The signal on the RS232 side looks really bad. I increased the value from C8 and C10 to 300nF but it's still not working.I have the same issue on on all RS232 tranceivers.
Channel 1 RS232 Tx signal (R10)
Channel 2 UART Tx signal (R12)