I had bought your URS232A last week.
I had tested the device with the correct circuit and coding that had been successfully tested before.
Unfortunately, it is not functioned.
May I know how to check whether the device is well-functioned?
As I know to check the functionality of the RS232 circuit by using loop back testing on pin 11 and 12 at MAX232.
I had tried on the device, but it is still not functioned.