DT-06 Terminal problem

[leeyome]

I am trying to communicate with the network device RS-232 using DT-06.

The TTL-to-RS232 circuit has been prepared, so communication is possible, but there is a problem that the line change character(LR ? CR?) is added one more time.

And there is also a problem that when the UP arrow key is pressed (originally, the previous command was displayed), special characters appear and it does not work properly.

I think it's because the terminal type on the DT-06 basic firmware is not match on general telnet terminals.