The MP detected an error during data transmission from the host computer. If the host-to-MP communication link is RS-232, possible errors are:
Overrun error
Parity error
Framing error
The overflow of the 256-byte input buffer
The most probable causes of the first three errors are incompatibilities between the MP and the host in baud rate, character length, parity selection and checking, or a number of stop bits.
What you should do:
To clear the error, power the MP down.
On an MP-30, make sure the RS-232 switch settings on the MP control board and quad serial board are correct.
On an SMP-400, make sure that the host RS-232 settings agree with the SMP-400 internal switch settings.
Power the MP back up.
If the error reoccurs, contact your Giddings & Lewis service representative.