help about write data RS232

[datbui]

Hello,  I'm starting to work with logic machine, I've been connecting the logic machine to a pc through the rs232 port,  I could write from the logic machine to a pc terminal, but result is wrong with string I wrote.
P/S: I conect LM5 Re:actor with PC by Board USB to USART.
Thank you.

[admin]

Check baud rate, stop bits and parity settings. Defaults for serial library are 115200, 1 stop bit, no parity.

[datbui]

Check baud rate, stop bits and parity settings. Defaults for serial library are 115200, 1 stop bit, no parity.

Thank you for your replay!
I checked, I use : Baud rate 115200, 1 stop bit, no parity.
I wrote string 'gh', Result: '  L'.
Thanks you.
My code in Resident:

if not port then
  require('serial')
  port = serial.open('/dev/RS232', { baudrate =115200 })
  port:flush()
  line = ''
end
port:write('gh')

[admin]

Are you sure you have USB-RS232 adapter? You might have USB-UART (TTL) which can be easily damaged if connected to RS-232 port.

[datbui]

Are you sure you have USB-RS232 adapter? You might have USB-UART (TTL) which can be easily damaged if connected to RS-232 port.

I use board USB to USART (chip CP2102- TTL) and use board STM32F4 discovery communicate by USART, both result same.
Thanks for help.