what arduino hardware does it run

[geetee24]

I have an arduino mega using serial3 connected to OBDLink SX USB OBD via HiLetgo FT232RL Mini USB to TTL Serial Converter Adapter Module 3.3V/5.5V

elmduino at 38400 nor 115200 and tried every protocol for lexus rx350 and sample code fails all the time.

Clearing input serial buffer
Sending the following command/query: AT D
Timeout detected with overflow of 0ms
Clearing input serial buffer
Sending the following command/query: AT Z
Timeout detected with overflow of 0ms
Clearing input serial buffer
Sending the following command/query: AT E0
Timeout detected with overflow of 0ms
Clearing input serial buffer
Sending the following command/query: AT S0
Timeout detected with overflow of 0ms
Clearing input serial buffer
Sending the following command/query: AT AL
Timeout detected with overflow of 0ms
Clearing input serial buffer
Sending the following command/query: AT ST 00
Timeout detected with overflow of 0ms
Clearing input serial buffer
Sending the following command/query: AT SP A0
Timeout detected with overflow of 0ms
Setting protocol via AT TP A%c did not work - trying via AT SP %c
Clearing input serial buffer
Sending the following command/query: AT SP 0
Timeout detected with overflow of 0ms
Setting protocol via AT SP %c did not work
Couldn't connect to OBD scanner

yet in terminal at 115200 the odb2 scanner processes correctly all the commands above. Any idea what is wrong in elmduino latest version? Thank you