Technology
Resistive touch screens on multiple monitors.
(multi-display environment)
Multiple touch screens can be operated with one host computer.
DMC's touch screen controller and mouse-emulation software allow up to 4 pcs of touch screens operated (2pcs in USB + 2pcs RS232C connections) with one host computer.
Feature 1
Usually, a host computer can identify multiple touch screens only if they are connected by RS232C.
In RS232C connection, unique IRQs and port addresses are assigned to each serial ports. Host computer can distinguish each touch screens, recognizing the different IRQ and port addresses.
On the other hand, multiple touch screens could not be identified in USB connection because USB devices share the same IRQ and port address.
DMC's touch screen controller has function to assign unique IDs (up to two IDs) to each USB controller by modifying USB descriptor.
If the touch screen controller (TSC-30/IC) has EEPROM, the EEPROM can store the device ID information. This makes any setting in hardware unnecessary.
Of course, calibration data can be assigned to each touch screen individually.
Feature 2
With DMC's mouse emulation software configuration, user levels can be assigned to connected touch screens.
User levels define the authority levels for each touch screen.
| Admin: | If user level is "Admin", touch screen can be operated any time regardless of operation status of other touch screens. Even if other touch screens are operated, operation right will be moved to a touch screen with Admin authority. |
| User: | If user level is "User", touch screen can be operated only when no other touch screens are operated. If other touch screens are operated, a touch screen with User authority cannot be operated until operation of the other touch screens has ended. |
| Operation right: | If one of multiple touch screens is operated, the operated touch screen is owning operation right. Touch screen with Admin authority can always achieve operation right while User authority allows touch screen to achieve operation right only when no other touch screens are owning operation right. In case other touch screens are owning operation right, touch screen with User authority can achieve operation right only after certain period of time has past after the other touch screens have released the operation right. The release time can be modified in mouse emulation software configuration. |
Usage example of multiple touch screens.
Customers operates touch screen display and, clerks operate the same display from behind for monitoring and maintenance.
[Jan.30,2012]
