Trane CVHE-SVU01E-ENX39640712050 Interprocessor Communication, IPC3 Definitions Bus Management

Interprocessor Communication

Inter Processor

Communications IPC3

When using Tracer CH530, you will not be required to know all the details about the structure of the IPC3 bus. However this page gives detailed information about the system for those of you that are really interested in how it works. The IPC3 protocol is based on RS485 signal technology. IPC3 was designed to be very efficient. It communicates at 19.2 Kbaud. This data rate will allow for three rounds of data per second on a 64 device network. A typical CVHE control network will have less than 50 devices. IPC3 allows for a maximum of 255 devices per network.

IPC3 Definitions:

Bus Management:

The DynaView™ provides the bus management having the task of restarting the link, or filling in for missing nodes when the normal communication has been degraded. This involves reassigning node addresses and filling in for nodes that are off-line. The DynaView™ always has a node number of 01.

Node Assignment: When a unit is factory commissioned, the LLIDS must have their node addresses assigned to them for storage in non-volatile memory. The node addresses are normally assigned sequentially during factory commissioning.

Node Zero:

Node number zero is is a special node assignment that is reserved for devices that are service selected. A LLID communicating on node address zero will also communicate on an assigned node address. A LLID will only communicate on node address zero if it is service selected.

Binding:

Binding is the process of assigning a node number and functional IDs to a LLID. Binding is a simple process:

1.Service selecting the LLID with a magnet.

2.Assigning functional IDs to that LLID with TechView™.

Functional Identification:

When each LLID on the bus is bound, its inputs and outputs are given a functional ID. The Frame LLIDS have only one functional ID, but most Panel LLIDs have more than one functional ID. A dual high voltage binary input will have two functional IDs, a quad relay output has four functional IDs.

The DynaView™ Main Processor with its IPC3 Bus communicates to the control panel devices, unit mounted devices, and any remote devices on the IPC3 bus network. The various devices are discussed in the upcoming sections.

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