Pepper-computer Modular Computers RS485 Bedienungsanleitung PDF herunterladen (Seite 289)

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SMART I/O User’s Manual

Chapter 6 Communications Modules

6.1.5 Functional Description

Figure 4.3.5.1: SM-RS232 Schematic Diagram

The serial interface is realized using the TxD3 and RxD3 lines of the 68302

SCC3 port on the SMART-BASE and for this reason this module can only

be used in the first slot on the SMART-BASE. Additionally, a software

programmed DTR function can be created with the CTS line being con-

nected to the interrupt line that is routed to the I/O controller of the SMART-

BASE. Although it is beyond the scope of this manual to discuss this con-

nection, PEP Modular Computers can provide advice on its implementation

if required.

The two LEDs on the front-panel indicate the status of the RxD and TxD

lines (ON means that the line is low).

An on-board serial EEPROM currently contains the ID-Byte for module

recognition and should not be altered. In the future, other module specific

data may be stored to provide more flexibility.

Transceiver

System

Interface

LED

Driver

TxD

RxD

DTR

CTS

GND

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