Motherboard - Serial Port RS-232 Testing Description - QuickTech Self Boot PC Hardware Diagnostic

QuickTech Self Boot PC Hardware Diagnostic
Motherboard - Serial Port RS-232 Testing Description -

Seven COM ports are tested including standard ports at 3F8; 2F8; 3E8, and 2E8. Inactive ports (addresses) are not highlighted.  You can also select any other address via the User COM selection. 

In most cases, cables attached to active COM ports should not have to be removed prior to running this test; however, if one or more COM ports fail the test, you should remove any external cables and then re-run the test to verify the results.

To ensure valid test results when running the External Loopback test, the serial Loopback plug supplied with QuickTech Self Boot  must be connected to the COM port that is to be tested.

When an active serial port is selected, QuickTech Pro identifies the UART chip. If a “Non Win” modem is detected, only internal testing is permitted and the External Loopback test is not available.  If a modem is not detected, both the Internal and External Loopback testing can be performed.

Run Test - You can select from Auto Detect; No Loopback; External Loopback, or forced “Non Win” Modem testing.  This option from the sub-menu performs register and data transfer checks and the entire range of baud rates is verified during the Data Transfer test (data transfer testing is not performed if a “Non Win” modem has been detected). 

If a “Non Win” modem has been detected, only tests applicable to modems are conducted. The Assigned IRQ Number test is only performed during the External Loopback test.

The test runs continuously until you stop it.  If a key is pressed to stop testing, the current loop is completed before the test stops.

External Loopback Test 

This test checks serial ports under simulated Transmit/Receive conditions by using an External Serial Loopback Plug (supplied with QuickTech Self Boot ) which connects to a COM port’s 9-pin connector.  This test also identifies the IRQ (interrupt) allocated to the serial port being tested.  Note that this test is not available if a modem is detected when the serial port is selected for testing.

To ensure valid test results, connect the Serial Loopback Plug to the COM port you wish to test.  Make sure the Loopback Plug is firmly connected to the COM port’s 9-pin connector.  If the Loopback Plug is not connected to the COM port under test, results for that port will be invalid. 


Was this article helpful?
0 out of 0 found this helpful
Have more questions? Submit a request


Please sign in to leave a comment.