VIM3 ttyS3 input triggers output string

VIM3
1 
fred@vim3a:~$ uname -a
Linux vim3a 4.9.241 #24 SMP PREEMPT Sat Jan 8 13:20:29 CST 2022 aarch64 aarch64 aarch64 GNU/Linux

Sending output is fine.
Receiving does not function properly.

Send into the VIM3 at ttyS3 a one byte 0X0E and it starts sending a string out.
Bottom trace is the one byte input
Top is the TX pin of VIM3

Tried several different options with reading and all of them have the same issue. Also removed all the overlays with the exception of UART3 and that did not solve the problem.

Any suggestions?

int rx_length = read(fd, rx_buffer, 255);

vim3_uart_1
vim3_uart_11041×628 41 KB

2 bytes sent to VIM

vim3_uart3
vim3_uart31034×610 34.6 KB 

//get termios structure settings
	tcgetattr(fd, &settings);
	
	//cfsetispeed(&settings, BAUDRATE);
	//cfsetospeed(&settings, BAUDRATE);
	//settings.c_cflag &= ~PARENB;
	//settings.c_cflag &= ~CSTOPB;
	//settings.c_cflag &= ~CSIZE;
	//.c_cflag |= CS8;
	
	settings.c_cflag = B9600 | CS8 | CLOCAL | CREAD;		//<Set baud rate
	settings.c_iflag = IGNPAR;
	settings.c_oflag = 0;
	settings.c_lflag = 0;
	tcflush(fd, TCIFLUSH);
	tcsetattr(fd, TCSANOW, &settings);