NEC VT440 Service Manual page 64

<COM>
Used for the selection of PC Com Port and Baud Rate.
Communication cannot be maintained unless the Baud Rate does not coincide with the PJ setting.
The default setting for the PJ is 38400 bps.
<CRC>
The VT440/540 is provided with a protective function not to perform unwanted POWER ON when the internal
data (except for the adjusting data) have been changed. The CRC function is used in the case of failure in
POWER ON due to the modification of the internal data.
When this button is pressed, the data error detection table is updated so that it is available for the present
data.
METHOD OF ADJUSTMENTS
5-17