OP7100
90 Troubleshooting
Out of the Box
Check the items mentioned in this section before starting development.
•
Verify that the OP7100 runs in standalone mode before connecting any
devices.
•
Verify that the entire host system has good, low-impedance, separate
grounds for analog and digital signals. The OP7100 might be connected
between the host PC and another device. Any differences in ground
potential from unit to unit can cause serious problems that are hard to
diagnose.
•
Do not connect analog ground to digital ground anywhere.
•
Double-check the connecting ribbon cables to ensure that all wires go
to the correct screw terminals on the OP7100.
•
Verify that the host PC’s COM port works by connecting a good serial
device to the COM port. Remember that COM1/COM3 and COM2/
COM4 share interrupts on a PC. User shells and mouse drivers, in
particular, often interfere with proper COM port operation. For
example, a mouse running on COM1 can preclude running Dynamic C
on COM3.
•
Use the supplied Rabbit Semiconductor power supply. If another power
supply must be used, verify that it has enough capacity and filtering to
support the OP7100.
•
Use the supplied Rabbit Semiconductor cables. The most common fault
of user-made cables is failure to properly assert CTS. Without CTS
being asserted, theOP7100’s RS-232 port will not transmit. Assert CTS
by either connecting the RTS signal of the PC’s COM port or looping
back the OP7100’s RTS.
•
Experiment with each peripheral device connected to the OP7100 to
determine how it appears to the OP7100 when powered up, powered
down, and/or when its connecting wiring is open or shorted.
•
The frame ground and 0 V are connected internally via a jumper on
header JP5. Remove the jumper if this connection causes problems or
is otherwise not required.
Summary of Contents for OP7100
Page 1: ...OP7100 Serial Graphic Display User s Manual 019 0065 070831 O ...
Page 10: ...OP7100 x About This Manual ...
Page 16: ...OP7100 16 Overview ...
Page 74: ...OP7100 74 Software ...
Page 82: ...OP7100 82 Graphics Programming ...
Page 88: ...OP7100 88 Installation ...
Page 98: ...OP7100 98 Specifications ...
Page 108: ...OP7100 108 Memory I O Map and Interrupt Vectors ...
Page 112: ...112 Serial Interface Board 2 OP7100 ...
Page 113: ...OP7100 Backup Battery 113 APPENDIX E BACKUP BATTERY ...
Page 116: ...OP7100 116 Backup Battery ...
Page 124: ...OP7100 124 Index ...
Page 126: ...XX0000 Schematics ...