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2.2.5.5 Function_4: Test Host Watchdog This function give a demonstration for the usage of host watchdog. The operation steps are given as below : Step 1: send out the #0305.000[0x0D] command Step 2: read back and show the operation result step 3: enable the host watchdog timer and set the watchdog timer = 1 sec step 4: send out the ~**[0x0D] command to refresh the host watchdog timer until user press any key to simulate a host failure condition step 5: wait for user’s key to continue. User can use a voltage meter to measure the D/A output safe value step 6: clear the module status Refer to Sec. 2.1.5 for demonstration. 2.2.5.6 Function_5: RS-485 Network Test This function is designed to test the reliability of RS-485 network. The operation steps are given as below : step 1: read next command and test pattern from TEST.DAT, repeat step2 to step6. step 2: initiate COM port step 3: send out command and receive result string step 4: compare the result string & the test pattern (read from TEST.DAT) step 5: if (result_string = test_pattern) OK=OK+1 else Error=Error+1 step 6 : Go to step 1 Refer to Sec. 2.1.6 for demonstration. DCON Utility (DOS) User’s Manual, Mar/2003, Ver. 1.0.1------------ 39