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Digitizers Verification Tests 153Appendix D
Functional Verification Test
The procedure in this section is used to quickly verify that the digitizer is
functioning. This test should be performed any time the user wants to verify
that the digitizer is connected properly and is responding to basic
commands.
Functional Test
Procedure
This test verifies that the digitizer is communicating with the command
module, external controller, and/or external terminal by accepting the *TST?
common command and performing a digitizer self-test. You have a high
confidence (90%) that the digitizer is operational if self-test passes.
1 Verify that the digitizer and command module or system resource
manager (e.g., embedded controller) are properly installed in the
mainframe.
2 Remove any input connections to the digitizer input terminals. Errors
may be induced by ac signals present on the digitizer's input
terminals during a self-test.
3 Execute the digitizer self-test using the *TST? command.
4 A "0" returned means self-test passed with no failures. Any other
value returned is a self-test error code and means a failure was
detected. See the TEST command in Chapter 3 for obtaining
information about self-test failures. See Appendix C and the TEST
command in Chapter 3 for self-test error codes.
NOTE If an incorrect address is used, the digitizer will not respond. Verify proper
address selection before troubleshooting.
Example: Self-Test
This BASIC example performs a digitizer self-test. Any number other than
0 returned indicates a test failure. See Appendix C and the TEST command
in Chapter 3 for self-test error codes.
10 OUTPUT 70905;"*TST?"
! Send the self-test command
20 ENTER 70905;A
! Read the test result
30 PRINT A
! Display the result
40 END