Intergraph ImageStation ZII Installation And Use Manual page 17

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NOTE You can also reset the Altek digitizer controller to the factory settings by loading the Altek Auxiliary
Menu and selecting the Reset 1-4 commands as described in "Troubleshoot in Windows NT."
If only one COM port is functional, first verify proper cable connections. Second, try swapping the
RS-232 COM port cables (replace the COM 1 cable with the COM 2 cable). If this changes which
COM port is functional, replace the cable. Third, try replacing the two-handed controller or the
interface PEM.
If neither COM port is functional, verify the ribbon cable connections between the digitizer and the
Altek digitizer controller. If both COM ports still do not function, consider replacing the digitizer
and the Altek digitizer controller.
If the two-handed controller fails to operate in the Windows NT environment, and the two-handed
controller is verified -- buttons, force sticks, and X, Y data transmission -- in the terminal program,
then the problem is not the digitizer. Try the following:
First, activate the two-handed controller in the Windows NT environment by selecting "Reset" from
the Altek command menu at the upper left corner of the digitizer. Second, disconnect and reconnect
the Altek digitizer controller power cord and toggle the interface PEM power switch. Third, reinstall
the Altek driver.