Find attached picture here. You can also refer to page no: 128 on Apex User Manual Rev 2.1 for console pin-out.
Connect Serial/Console cable to Trango Apex at one end and reboot the radio with below Serial/Console port settings on your laptop/computer at other end.
Serial Port Settings:
Bits per second: 115200
Data bits: 8
Stop Bits: 1
Flow Control: none
You will be prompted with trango login: prompt.
Login with Default username: admin password: trango
You need to login to config mode to change configuration. Simply type config in view mode and password: trango