User Manual

• Serial overrun error (bit 1)

A hardware-level error that occurs when the UART’s internal buffer fills up. This should not

occur during normal operation.

• Serial buffer full (bit 2)

A firmware-level error that occurs when the firmware’s buffer for bytes received on the RX

line is full and a byte from RX has been lost as a result. This error should not occur during

normal operation.

• Serial CRC error (bit 3)

This error occurs when the Maestro is running in CRC-enabled mode and the cyclic

redundancy check (CRC) byte at the end of the command packet does not match what the

Maestro has computed as that packet’s CRC (Section 5.d). In such a case, the Maestro

ignores the command packet and generates a CRC error.

• Serial protocol error (bit 4)

This error occurs when the Maestro receives an incorrectly formatted or nonsensical

command packet. For example, if the command byte does not match a known command or

an unfinished command packet is interrupted by another command packet, this error occurs.

• Serial timeout (bit 5)

When the serial timeout is enabled, this error occurs whenever the timeout period has

elapsed without the Maestro receiving any valid serial commands. This timeout error can be

used to make the servos return to their home positions in the event that serial communication

between the Maestro and its controller is disrupted.

• Script stack error (bit 6)

This error occurs when a bug in the user script has caused the stack to overflow or underflow.

Any script command that modifies the stack has the potential to cause this error. The stack

depth is 32 on the Micro Maestro and 126 on the Mini Maestros.

• Script call stack error (bit 7)

This error occurs when a bug in the user script has caused the call stack to overflow or

underflow. An overflow can occur if there are too many levels of nested subroutines, or

a subroutine calls itself too many times. The call stack depth is 10 on the Micro Maestro

and 126 on the Mini Maestros. An underflow can occur when there is a return without a

corresponding subroutine call. An underflow will occur if you run a subroutine using the

“Restart Script at Subroutine” serial command and the subroutine terminates with a return

command rather than a quit command or an infinite loop.

• Script program counter error (bit 8)

This error occurs when a bug in the user script has caused the program counter (the address

of the next instruction to be executed) to go out of bounds. This can happen if your program

is not terminated by a quit, return, or infinite loop.

4. Using the Maestro Control Center Page 39 of 99