Pepper Computer RS232, RS485 user manual Smart-Ext

Chapter 3 SMART-EXT SMART I/O User’s Manual

3. SMART-EXT

The SMART-EXT is a carrier unit enabling the connection of a further 2 SMART-Modules thereby enhancing the I/O capacity of the SMART I/O system. Up to 4 of these extensions may be cascaded via a 10-wire flat-band cable with integrated 3-wire SPI (Serial Peripheral Interface). To achieve a common interface between modules, a SMART I/O ‘C’ library is provided by PEP.

3.1 Specifications

Controller	MC68HC705C8A
- Frequency	4 MHz
- Firmware	PEP Firmware for OTP device
Interface Speed	Set to 1 MHz
Power Consumption	Typ. 25 mW
Temperature Range	-20°C to + 125°C
- Storage
- Standard	0°C to +70°C
- Extended	-40°C to +85°C
Operating Humidity	0 to 95% non-condensing
Weight	260g (without modules, blank
	panels or screw terminals

The SPI follows a Motorola defined communication protocol which is beyond the scope of this manual to describe. More information may be found by referring to the relevant data-sheets.

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March 12, 1996 ©1996 PEP Modular Computers GmbH Page 3 - 3