Rabbit OP7100 User Manual download pdf (Page 90)

OP710090

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 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.

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Rabbit OP7100 User Manual Page 90