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Principle of Operation and Addressing
PII
CPU
PIQ
Figure 5-1. General Functional Description
The control program controls the CP 521 via the I/O bus and evaluates its
data.
The I/O bus transfers 64 data bits (8 bytes) from the CPU to the CP 521 and 64
data bits (8 bytes) from the CP 521 to the CPU.
The CP 521 has three interfaces:
•
An interface to the I/O bus
•
Passive TTY and RS-232-C (V.24) interface to the peripheral device
•
A receptacle for a memory submodule
The serial interface transfers data between the module and the peripheral
device.
Compatible peripheral devices:
•
Keyboard
•
Terminal
•
A further CP 521
•
CPU 944 (ASCII interface)
•
CP 523
The memory submodule is only required in print mode and contains the
parameters for the printer interface and the message texts. For permissible
memory submodules see list of accessories ( 2.7).
5-2
Memory
sub-
module
CP 521
•
Printer with active TTY interface
•
Printer with RS-232-C (V.24) interface
CP 521
Printer
Terminal
device or
CP 521
GWA 4NEB 812 6030-02b
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