Pepper Computer RS485, RS232 user manual Functional Description, Smart I/O Block Diagram

SMART I/O User’s Manual Chapter 2 SMART-BASE

2.3 Functional Description

Figure 2.3.0.1: SMART I/O Block Diagram

	MCU	Memory
Clock
	MC68302	FLASH
Generators
	@ 20 MHz	EPROM
		SRAM
Serial Interfaces
		SPI
RS485
		Interface
RS232

DC/DC

I/O Controller

Timer/Counter

Interface

SMART-Module

Interface

The MCU, an MC68302 microprocessor operating at 20 MHz is responsible for handling all communication between the various interfaces and on-board memory.

An RS485 highspeed PROFIBUS 2-wire interface is optically isolated from the system and may be configured for full duplex operation (a 4-wire inter- face available on request for OEM volume). Likewise, a fully configured RS232 modem interface is available for program downloading for example on SMART I/O systems supporting FLASH memory for this task or to the RAM disk etc.

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