This is not an EIA/TIA-561 or similar pinout. These devices can only be used in pairs. They cannot be used like other similar adapters. RJ-45 Pin 1 <-> DE9 Pin 3RJ-45 Pin 2 <-> DE9 Pin 2RJ-45 Pin 3 <-> DE9 Pin 7RJ-45 Pin 4 <-> DE9 Pin 8RJ- 45, Pin 5 <-> DE9 , Pin 6RJ-45, Pin 6 <-> DE9, Pin 5RJ-45, Pin 7 <-> DE9, Pin 4RJ-45, Pin 8 <-> DE9, Pin 1 Switch cable can be used to switch to the RS232 serial switch port . The DB9 9-pin serial port is usedβ¦