Ways to do Tech 2 RS232 self test?

In 2002, the GM Tech 2 purchased the land by means of its Downtown Improvement Authority for $6 million, in line with a C&G Newspapers report, then tore down the hotel as part of its plan for redevelopment of the civic center area. But the property where the dealership will sit has been vacant since.
The new site will see heavier traffic patterns than the group's existing nearby Cadillac dealership, and it was logical when Prestige compared the cost of building the new dealership with the cost to renovate the existing store, Prestige spokeswoman Renae Logan wrote in an email.
1. Power up the Tech2. Connect RS232 cable with Tech II scanner main unit.
2. Come to main menu. Select F4:Tool Options
3. Select F3: Self Test
4. Follow the system prompts:
Before running the Tech 2 self test:
CANdi interface must not be connected
ALDL loopback should be connected
Failure to follow these instructions may invalidate the self test
Press EXIT to continue
5. Select F3: Selectable main PCB
6. Select F2:RS232 LoopBack
7. Tech2 RS232 cable self test has passed
If RS232 cable passes self test, the commutation between Tech2 scanner and PC is well built.
The article offers information on examining the GM Tech 2 vehicle diagnostic function. The article gives focus to the Vetronix Tech 2, which is said to be the factory scan tool for GM nd a few other brands. It examines data network diagnostics on GM's Class 2 data network systems. It has a monitoring and bidirectional control-based diagnostic feature called the Class 2 Message Monitor.