Epson C I - 4 0 4 0, C I - 4 0 5 0 user manual Appendix a System Interface Description, For CI

Appendix A System Interface Description

There are two system interfaces:

Sone serial interface with RS-232C or RS-422 support (RS-422 only CI - 4040)

Sone Parallel Centronics interface.

The interfaces can be operated in three different modes: for CI - 4040

Sparallel interface active

Sparallel interface active in shared mode with serial RS-232C

Sparallel interface active in shared mode with serial RS-422

for CI - 4050

Sserial interface active

Sparallel interface active

Sboth 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 (PARALLEL, PARALL. / RS232, or PARALL. / RS422; SERIAL, PARALLEL or SHARED) and to the size of the interface buffer is possible only when the interface buffer is completely empty of data.

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