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SMART I/O User’s Manual

Chapter 6 Communications Modules

6.1 SM-RS232

6.1.1 Introduction

The SM-RS232 provides serial communication observing a true RS232

interface definition. Interface parameters such as baud rate, stop bits, data

bits and parity are defined by software. The hardware itself supports baud-

rates up to 120 kbaud but the delivered software only allows rates up to

19200 baud. Communication tasks are handled directly by the SCC3 port of

the 68302 chip on the SMART-BASE hence this module can only be used in

the first slot of the SMART-BASE as this is the only slot where the CPU

port lines can be used serially. Two LEDs showing data transmission provide

the user interface.

6.1.2 Specifications

† CTS/DTR lines are NOT supported by PEP standard software. XON/

XOFF software protocol is used instead.

6. Communications Modules

Input

Transceiver RxD and CTS †

Up to 19200 Baud

Output

Transceiver TxD and DTR †

Up to 19200 Baud

EEPROM 256 Byte Serial EEPROM

Front Panel

Green RxD LED

Yellow TxD LED

Power Consumption 23mW (min.), 75mW (max.)

Module Weight 30g

ID Byte $80 Read by the SPI Interface

1 2 ... 282 283 284 285 286 287 288 289 290 291 292 ... 319 320

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Pepper-computer Modular Computers RS485 Bedienungsanleitung Seite 287