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System Interface Description
Appendix A
There are two system interfaces:
$ one serial interface with RS-232C or RS-422 support
$ one Parallel Centronics interface.
The interfaces can be operated in three different modes:
$ parallel interface active
$ parallel interface active in shared mode with serial RS-232C
$ parallel interface active in shared mode with serial RS-422
The following chapter gives an overview about interface characteristics, control
signals, protocols, and cabling.
Any change to the operation mode (PARALLEL, PARALL. / RS232, or
PARALL. / RS422) and to the size of the interface buffer is possible only when
the interface buffer is completely empty of data.
A-1
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