Pepper Computer Modular Computers RS485 - Manual (Page 287)

SMART I/O User’s Manual
©1996 PEP Modular Computers GmbH March 12, 1996 Page 6 - 5
Chapter 6 Communications Modules
6
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