Understanding bindings

The address table consists of the following elements (refer to column headings in Table 38):

•Use Domain at Index: This number represents a pointer or reference to a table entry in the Domain table. For Trane devices, the value at index (or row) 0 will be a decimal 17.

•Group Number or Subnet Address field: The function varies depending on the binding type. For group bindings, the group number is stored here. For subnet/node bindings, the subnet address is stored here.

•Group Member at Node Address field: This varies depending on the binding type. The group member specifies a unique number for each member of a group binding.

•Group Size field: This specifies the total number of members in the group binding.

The address table in Table 38 shows a subnet/node binding at index 0, which lists a device at DSN 17-1-8 as the destination. And it shows that the device is the second member of Group 1, which has a total of three members.

Table 38. Address table

 

 

 

Group

Group

 

 

 

Use

Number or

Member of

 

Addr

Binding

Domain at

Subnet

Node

 

index

type

Index

Address

Address

Group Size

0

subnet/node

0

1

8

n/a

 

 

 

 

 

 

1

group

0

1

2

3

 

 

 

 

 

 

2

unbound

 

 

 

 

 

 

 

 

 

 

3

unbound

 

 

 

 

 

 

 

 

 

 

14

unbound

 

 

 

 

 

 

 

 

 

 

Designing bindings

On a LonWorks job, binding connections should be designed and documented just like wiring connections are designed and documented on shop drawings. Follow these rules, limits, and the methodology provided when designing bindings:

Binding rules and limits

1.Bindings can be made only between NVs that have the same network variable type (SNVT or UNVT).

For example, nvoSpaceTemp is of type SNVT_temp_p and nviSpaceT- emp is also of type SNVT_temp_p, so these two variables can be bound. Rover takes care of matching network variable types for you, but during design, this fundamental rule should be kept in mind.

2.Unique subnet/node binding types consume an address table entry on the sending device only.

BAS-APG001-EN

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Trane Engineered Smoke Control System for Tracer Summit manual Designing bindings, Binding rules and limits, Address table
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BAS-APG001-EN, Engineered Smoke Control System for Tracer Summit specifications

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