Kontron CP372 - Manual (Page 63)

CP372 System Considerations
ID 25780, Rev. 01 © 2002 Kontron Modular Computers GmbH Page 5 - 3
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P R E L I M I N A R Y
5. System Considerations
5.1 Introduction
In addition to the basic specification requirements for signals to and from the CP372 which
have been addressed in the previous chapters, system integrators need to be aware of the
overall system environment and the application needs when designing the interfacing to the
CP372. There are certain basic considerations which require explicit resolution as well as oth-
ers which are of a more subtle nature that may under circumstances impact the performance
or validity of the digital to analog conversion process. The following chapters address a number
of more apparent considerations which should be addressed but certainly not all of the possible
situations which may be encountered. Many of the considerations presented here are recom-
mendations, but some are definite requirements if the CP372 is to successfully achieve its pur-
pose.
5.2 General
Considerations:
1. For output channels, the I or V pins respectively are not to be connected except when
required.
2. It is recommended to use twisted pair wiring for output signals.
3. Mixing of output signal types to be generated by the CP372 is permitted.
4. The type of signal expected to be generated for each output channel of the CP372 must
correspond to the driver software configuration for that channel. If not the result will be
erroneous and the CP372 may be damaged.
5. Care must be taken to ensure that proper grounding concepts are followed, and that the
integrity of the grounding system within the application be maintained.
6. Output wire routing should avoid proximity to high voltage or current sources.
7. Where possible output wiring length should be kept as short as possible.
5.3 Shielding
Considerations:
1. Output cable shielding in general is recommended.
2. The requirements for shielding can be seen primarily as a function of the system design
and environment, but empirical results must also be considered.
3. The CON2 connector has a metal housing which is connected to the CP372 shield and
is isolated from the analog ground.
4. Ensure that if shielding is used that it is not in anyway connected to the analog ground.
5.4 Process-side Signal Conditioning
Considerations:
1. Output signal conditioning on the process side of the application must be as specified for
the signal type or erroneous results will occur as well as possible damage to the CP372.
2. Ensure that when analog ground pins on CON2 are used that on the process side no
grounding loops are created. Refer to chapter 4 for further information.