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Appendix A System Interface Description
There are two system interfaces:
S one serial interface with RS-232C
S one Parallel Centronics interface.
The interfaces can be operated in three different modes:
S serial interface active
S parallel interface active
S both interfaces active in shared mode
The following chapter gives an overview about interface characteristics, control
signals, protocols, and cabling.
Any change to the operation mode (SERIAL, PARALLEL or SHARED) and to the
size of the interface buffer is possible only when the interface buffer is
completely empty of data.