The display shows the outputs from two ports Serial.
1. Why are there several of them?
2. When you switch them with a PC232/TTL jumper, do they both switch to the same mode? Is it impossible for one to work in TTL, the second in RS232?
Hello, you can check the product manual you received on the first day. The last page contains the pin definition for this product, which only has one communication port。
Your picture does not match DMG80480T070_ 03WTC