SST-DN3-104-1 and SST-DN3-104-2
Hardware Reference Guide
Card Overview
15
Document Edition: 1.0, Document #: 715-0082, Template Edition: 1.1, Template #: QMS-06-045
Use, duplication or disclosure of this document or any of the information contained herein is subject to the restrictions on page ii of this document.
1.2 Card Features
The card is a PC/104 interface for communication with DeviceNet and other CAN-based
networks. The main features of each channel are:
•
16-bit PC/104 interface (compliant with PC/104, specification 2.4). 16 bits is the width
of the data bus and does not restrict the card from being used in a 32-bit operating
system.
•
66 MHz ColdFire Processor
•
256 KB of shared RAM
•
DeviceNet-compliant 5-pin CAN connector
•
Data rate of up to 1 Mbaud for CAN, and 125K, 250K and 500K for DeviceNet
•
Bi-color LEDs showing card status
•
Isolated physical layer
1.3 Byte Ordering
The card uses Intel-style (little endian) byte ordering for multi-byte entities LSB-low address and
MSB-high address. If your host system uses Motorola (big endian) byte ordering (MSB-low
address and LSB-high address), you must compensate for byte ordering in software.
The following language macro will compensate for byte ordering in a 16-bit data entity:
#define SWAP_WORD (WordData) ((WordData<<8) | (WordData>>8))
1.4 DN3 Compatibility
For a comparison of DN3 with DNP, refer to Section D.2,