### MP-090 APC UART input error

An RS232 data transmission error (such as character overrun) has occurred on the APC to SMP400 communication line.

What you should do

1. To clear the error, click Clear error in the XYZ Display window. To clear it using an RCU-II, press and hold down the Servo Power Off button and then press the Joy button twice.

2. If the error reoccurs, call your Giddings & Lewis service representative.