Digi 90031300 manual Test 7 Sync External Loopback Test, Test 8 Eeprom Test, Test 9 Watchdog Test

Test 7: Sync External Loopback Test

This test places the high-speed synchronous channel in external loopback mode. In video mode, this test can be run with or without an external loopback cable. The external loopback test checks the internally clocked and self clocked transmission modes (0-2, 6-14, 27-29 and 60-74). (See Appendix B, beginning on page 89, for a list of the modes).

Using Display Panel

While 7 is shown on the 7-segment LED display, press the left push-button to begin the test. This test runs in external mode and checks the port in all 12 self-clocking and internally clocked modes (0-2, 6-14, 27-29 and 60-74) of synchronous transmission. All 256 8-bit character values (00h-FFh) are sent in each mode. Errors are counted on the ten LEDs, and the test is repeated until the left push-button is pressed again. At this point, either P7 (pass) or F7 (fail) will be displayed. Pressing the left push-button again restarts the test; pressing the right push-button advances to Test 8.

Test 8: EEPROM Test

This test generates a checksum of the EPROM contents and compares it with the checksum stored in the EEPROM. If the checksums match, the test passes. This test does not write to the EEPROM. (EEPROM write operations occur only when a new node number is set). To begin this test in display panel mode, press the left push-button while 8 is displayed. Errors are counted on the ten LEDs, and the test is repeated until the left push-button is pressed again. At this point, either P8 (pass) or F8 (fail) will be displayed. Pressing the left push-button again restarts the test; pressing the right push-button advances to Test 9.

Test 9: Watchdog Test

This test checks out the watchdog timer. This is a hardware feature that is used to ensure system reliability. When the watchdog timer is loaded and enabled, the timer begins counting down. It is up to the system to keep reloading the timer to prevent it from expiring. Normal test execution allows the timer to expire, then the test is repeated. The test fails if the timer has not expired after 1 second. To begin this test in display panel mode, press the left push-button while 9 is displayed. Errors are counted on the ten LEDs, and the test is repeated until the left push-button is pressed again. At this point, either P9 (pass) or F9 (fail) will be displayed. Pressing the left push-button again restarts the test; pressing the right push-button advances (wraps around) to the node number.

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