Functional Description - PEP Modular Computers Modular Computers RS485 User Manual

SMART I/O User's Manual

2.3 Functional Description

Figure 2.3.0.1: SMART I/O Block Diagram
Clock
Generators
Serial Interfaces
RS485
RS232
DC/DC
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.
Page 2 - 6
MC68302
@ 20 MHz
I/O Controller
Timer/Counter
Interface
©1996 PEP Modular Computers GmbH
Chapter 2 SMART-BASE
MCU
SMART-Module
Interface
Memory
FLASH
EPROM
SRAM
SPI
Interface
March 12, 1996