Home |
• | SERTEST is a DOS program. |
• | SERTEST was written by me for use on the IBM PC family of computers (IBM PC, IBM XT, etc.) I cannot guarantee correction operation on other computers. |
Step 2.1 | Run SERTEST.EXE The main menu of SERTEST will appear. It shows the serial ports that the POST found installed. |
Step 2.2 | Press the key corresponding to the port that you want to test. |
Step 3.1 | Press the I key. All eight sub-tests are expected to pass. If any fail, there is something wrong - no point in proceeding to do any further tests in SERTEST. |
Step 4.1 | Connect an RS-232 serial loopack plug and the port under test. For the loopback plug, SERTEST requires the following pins to be connected. 25-pin connector: pins 2 and 3, pins 4 and 5, pins 6 and 8 and 20 and 22 (photo at here) 9-pin connector: pins 3 and 2, pins 7 and 8, pins 6 and 1 and 4 and 9 |
Step 4.2 | Press the E key. All eight sub-tests are expected to pass. If all fail: - There is something wrong - no point in proceeding to do any further tests in SERTEST. - Ensure that the required type of loopback connector is fitted. If only one/some fail: - There is something wrong - no point in proceeding to do any further tests in SERTEST. - Ensure that the required type of loopback connector is fitted. - Because the earlier 'internal loopback' test passed, it is highly likely that the fault is a bad level converter chip. |
Step 5.1 | Press the I key. All five sub-tests are expected to pass. |