Gateway Link Failure - Banner Sure Cross Performance DX80 Instruction Manual

Wireless i/o networks

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Sure Cross

Performance DX80 Wireless I/O Networks

Host System

5.8.2 Gateway Link Failure

Gateway link failures are determined by three global parameters: polling interval, maximum missed message count, and

re-link count.

The polling interval (or rate) defines how often the Gateway communicates with each Node to verify the radio link is

operating. The Gateway increments a Node's missed message count if a Node does not immediately report back from a

polling request. If a Node's missed message count exceeds the maximum missed message count, the Gateway

generates a timeout error in the Modbus I/O 8 register of the appropriate Node.

The auto-recover feature uses the re-link count parameter. If enabled, the error condition heals itself if the Gateway and

Node have successfully exchanged N-number of good polling messages. The N-number is the re-link count, or the number

of messages required to re-establish a radio link.

When the Node's Gateway Link Failure flag is set and the Gateway determines a timeout condition exists for a Node, any

outputs linked from the failing Node are set to the user-defined default state. Each Node has a Gateway Link Failure flag

that can be set or cleared depending on the particular application.

In the sample system shown, the communication link between the Gateway and Node 1 has failed. Node 2 must have its

Gateway Link Failure flag set to allow any outputs linked to Node 1 to be set to the defined default state when the

communication link between Node 1 and the Gateway fails.

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Host System

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Gateway

Node 2

Gateway

Node 2

Node 1

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