EMS CPC-PP User Manual
CAN-PC Interface
CPC-PP
User Manual
EMS
THOMAS WÜNSCHE
Sonnenhang 3
D-85304 Ilmmünster
Tel +49-8441/490260
Fax +49-8441/81860
Documentation for CAN-Interface CPC-PP
Document version: V2.0
Documentation date: January 17th, 2005.
No part of this document or the software described herein
may be reproduced in any form without prior written
agreement from EMS Dr. Thomas Wünsche.
For technical assistance please contact:
EMS Dr. Thomas Wünsche
Sonnenhang 3
D-85304 Ilmmünster
Tel.: +49-8441/490260
Fax: +49-8441/81860
e-mail: support@ems-wuensche.com
Our products are continuously improved. Due to this fact
specifications may be changed at any time and without
announcement.
WARNING: CPC-PP hardware and software may not be
used in applications where damage to life,
health or private property may result from
failures in or caused by these components.
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User Manual CPC-PP
EMS Dr. Thomas Wünsche iii
Contents
1 Overview..................1
1.1 Attributes ...................1
1.2 General description ..............1
1.3 Sample Applications .............2
1.4 Ordering Information .............2
2 Software ..................3
2.1 Functions of CPC-PP .............3
2.2 Application program: Realization concepts . . 3
2.3 Synchronous Interface ............4
2.4 Asynchronous Interface ............4
2.5 Data Structures and Library Functions ....5
2.6 MS-Windows Driver Additional Information . 13
3 Electrical Characteristics ........15
3.1 Absolute Limiting Values...........15
3.2 Nominal Values ...............16
4 Operating Instructions .........17
4.1 Connection Scheme .............17
4.2 Installation ..................18
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1 Overview
1.1 Attributes
CPC-PP offers a range of unique features
which make it valuable for many CAN based
applications:
•
Low cost CAN-interface for IBM PC and
compatibles
•
Connection to the parallel printer port usable also on notebook computers
•
CiA and ISO 11898 compatible
bus-interface
•
Smart system with integrated microcontroller of 80C32-family
• Directly integrated into connector
• Small size for use in low-space condi-
tions
• Modular application interface with libra-
ries for Borland C++, Borland Pascal
and Microsoft C 6.0
•
Optional MS-Windows driver with DLL
based API and VxD/SYS technology for
high communication throughput
1.2 General description
The small size CPC-PP module provides easy
access to CAN-networks using the parallel
printer port of the PC. Due to the fact that no
internal card slot is required, CPC-PP can also
be used with laptop or notebook computers.
CPC-PP eases the development of application
software on the PC. The integrated microcon-
troller takes load of the PC-CPU and preprocesses CAN-messages. A high level programming interface with modular design eases software development. A library of interface
routines for Borland C++, Borland Pascal and
Microsoft C 6.0 is included.
Power supply for CPC-PP is provided directly
across the CAN-bus conforming with CiA standard DS-102. A power saving mode using variation of processor clock can be activated by
software at low bus-speeds. Besides the conceptual properties also the price of CPC-PP
supports low overall costs.
1.3 Sample Applications
The application area of CPC-PP is very wide.
Some sample applications are detailed in the
following:
•
Online-configuration of CAN networks
•
Network setup and analysis
• Use of PCs as CAN nodes on the appli-
cation level
•
Visualisation of process parameters in
CAN based systems
1.4 Ordering Information
10-00-040-20 CPC–PP
Active CAN-PC interface for
printer port
10-00-140-20 CPC–PP/EX
Active CAN-PC interface for
printer port with extended
supply voltage range
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2 Software
The software consists of two parts which communicate across the parallel printer port of the
PC. One part is executed by the microprocessor inside CPC-PP and can not be changed by
the user. The application program runs on the
PC and makes use of the interface library.
2.1 Functions of CPC-PP
CPC-PP offers enhanced functionality for CAN
communication:
•
Transmission and reception of
CAN-messages
• Filtering and buffering of received mes-
sages
• Measurement of bus-load
The functions of CPC-PP are accessed across
the interface library of the PC.
2.2 Application program: Realization concepts
The library of interface functions supports two
ways to implement the application program.
The synchronous mode complies with conventional programming. The sequence of program
steps is given by the program structure. Asynchronous mode allows event driven programming similar to the way used in graphical user
interfaces.
2.3 Synchronous Interface
The implementation of the
main program with synchronous interface allows simple
and clearly arranged programs with sequential flow. It
is suitable mainly for simple
applications, which allow a
predefinition of events to process. This is true if, for example, only CAN-messages are
to be received or only
bus-load measurement is to
be realized.
2.4 Asynchronous Interface
The asynchronous interface
provides enhanced flexibility
in reaction to events which
are not predictable in their
sequence of occurrence.
Communication objects can
be processed independently
of program state, reactions
can be configured flexible.
For this purpose every communication object is handed
on to a set of handling
functions. Such functions are
provided within the programming library. The application
programmer can add routines as required by application purposes.
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command
execution
by CPC-PP
command
initiation
wait for result
continue
main
program
command
execution
by CPC-PP
command
initiation
further
program
execution
use result
main
program
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