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Appendix A - Troubl
Appendi
x A - Troubleshooting
eshooting Guide
Guide
Raw coordinates for the E281-2310 serial controller should range from just
Raw coordinates for the E281-2310 serial controller should range from just
above 0 to just below 4095. When the touchscreen is mounted in its normal
above 0 to just below 4095. When the touchscreen is mounted in its normal
orientation, (cable exiting right-center), the origin will be in the lower-left corner.
orientation, (cable exiting right-center), the origin will be in the lower-left corner.
If the touchscreen is installed with the cable exiting left-center, the origin will be
If the touchscreen is installed with the cable exiting left-center, the origin will be
in the upper-right corner. Both X and Y should increase steadily as you slide your
in the upper-right corner. Both X and Y should increase steadily as you slide your
finger from the origin to the diagonally opposite corner. Check the other two
finger from the origin to the diagonally opposite corner. Check the other two
corners to make sure their coordinates look correct and that the touchscreen
corners to make sure their coordinates look correct and that the touchscreen
appears linear in each axis.
appears linear in each axis.
TOUCHES should display "TRUE" only when you lift your finger. If "TRUE"
TOUCHES should display "TRUE" only when you lift your finger. If "TRUE"
releases are indicated while maintaining a constant touch, a problem such as
releases are indicated while maintaining a constant touch, a problem such as
excessive system noise or low signal strength may be present.
excessive system noise or low signal strength may be present.
TOUCHES is also useful with PC-Bus controllers to verify the correct IRQ is
TOUCHES is also useful with PC-Bus controllers to verify the correct IRQ is
selected and there are no IRQ conflicts..
selected and there are no IRQ conflicts..
RS-232 Connections
RS-232 Connections
Review cable connections and switch settings. If you have used your own cables
Review cable connections and switch settings. If you have used your own cables
or adapters for connection to the serial port, check pinouts. Verify that the data
or adapters for connection to the serial port, check pinouts. Verify that the data
transfer rate (baud rate) of the computer's serial port is the same as selected by
transfer rate (baud rate) of the computer's serial port is the same as selected by
switches or jumpers on the controller.
switches or jumpers on the controller.
The E281-2310 controller operates at standard RS-232 levels. The serial port
The E281-2310 controller operates at standard RS-232 levels. The serial port
connector, P2, is a 2x5 header with pins on 0.100-inch centers. It is configured so
connector, P2, is a 2x5 header with pins on 0.100-inch centers. It is configured so
a ribbon cable and commonly available insulation displacement connectors (IDCs)
a ribbon cable and commonly available insulation displacement connectors (IDCs)
may be used. Pin positions and signals are given below. See page 65 for DB9 and
may be used. Pin positions and signals are given below. See page 65 for DB9 and
DB25 connector pin positions.
DB25 connector pin positions.
9
9
7
7
5
5
3
3
1
1
•••••••••••••••••
•••••••••••••••••
• • · ·
· ·
· ·
· ·
· · • •
• • X X
· ·
· ·
· ·
· · • •
•••••••••••••••••
•••••••••••••••••
10
10
8 8
6 6
4 4
2 2
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Troubleshooting
