DS200LDCCH1ANA combustion engine card

  This appendix describes some technical details of the lower layers implementing the AF 100 communication. The information presented is by no means necessary to install and maintain an Advant Fieldbus 100 network. It merely completes the technical description and is intended for the curious reader only. Basic Communication Principles All communication on the Advant Fieldbus 100 is based on the concepts of “Master Frames” and “Slave Frames”. The bus master sends a master frame, and some other modules (or the communication interface itself) responds with a slave frame It is not required that a slave frame be sent after each master frame. Even during normal operation, it is a common event that a slave frame is missing. The master frame merely offers an opportunity to respond with a slave frame. Thus, when no bus master is present, no communication is possible at all.

Mounting/Demounting the Twisted Pair/Twisted Pair Modem TC515 

The Twisted Pair/Twisted Pair Modem TC515 is mounted on a DIN-rail. The DINrail is mounted to a metal sheet in a cabinet or on an enclosure wall with fastening screws every 100 mm, to ensure a good chassis ground connection. The modem has a snap locking device that attaches it to the mounting rail. It is possible to mount the modem both vertically and horizontally. To mount the modem, place it on the top edge of the DIN-rail, release the rail latch with a flat screw driver and snap the bottom mechanism into place. When the unit is in place on the DIN-rail and in vertical position, take away the screw driver and the rail latch will fix the unit in position on the DIN-rail. Release the unit from the DIN-rail in a similar way Snapping the Modem to the DIN-rail makes contact by the Ground Clip Spring with the chassis.

Broadcast

 All frames are broadcast on the Advant Fieldbus 100. This means that all attached communication interfaces are able to receive and interpret data. However, as some frames are intended for a single destination only (for example frames used for message transfer), some built-in hardware filters are available. They enable a communication interface to receive exactly the frames that it wants and not be bothered with frames destined for other communication interfaces.