Troubleshooting

The CMD912X board is fully tested and operational before shipping. If it fails to function properly, inspect the board for obvious physical damage first. Ensure that all IC devices in sockets are properly seated. Verify the communications setup as described under GETTING STARTED and see the Tips and Suggestions sections following for more information.

The most common problems are improperly configured communications parameters, and attempting to use the wrong COM port.

1.Verify that your communications port is working by substituting a known good serial device or by doing a loop back diagnostic.

2.Verify the MODE, CONFIG, and COM switch settings are correct.

3.Verify the power source. You should measure approximately 9 volts between the GND and +VIN connections on the TB1 power connector with the standard power supply provided.

4.If no voltage is found, verify the wall plug connections to 115VAC outlet and the power connector.

5.Verify the logic power source. You should measure +5 volts between the GND and +5V connections on the TB1 power connector. If the +VIN supply is good and this supply is not +5V, immediately disconnect power from the board. Contact support@axman.com by email for instructions and provide board name and problem.

6.Disconnect all external connections to the board except for COM1 to the PC and the wall plug.

7.Make sure that the RESET line is not being held low. Check for this by measuring the RESET pin on P4 for +5V.

8.Verify the presence of a 16MHz square wave at the EXTAL pin or 8MHz E clock signal if possible.

9.Contact support@axman.com by email for further assistance. Provide board name and describe problem.