# Script Instructions
Following instructions can be used in expressions.
|RETURN||This instruction returns from the Neuron program to its calling program. The following part of this program is not executed. RETURN must be the last instruction in an expression.|
|GOTO POSxxx||This instruction continues the execution from the statement that contain the declaration of the label xxx (1-999). GOTO POSxxx must be the last instruction in an expression.|
|CALL SRxxx||This instruction calls the subroutine xxx (1-999) and executes the program in that subroutine. After completed the program in the subroutine, or executed a RETURN instruction, the execution continues with the instruction / statement that follows the CALL SRxxx.|
|AUTO||This instruction is to change machine mode from manual mode or service mode to auto mode. Then, it runs auto routine.|
|MANU||This instruction is to change machine mode from auto mode or service mode to manual mode. Then, it runs manu routine.|
|SERV||This instruction is to change machine mode from auto mode or manu mode to service mode. Then, it runs manu routine.|