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Appendix M. PakBus Networking Details

The RF401 or RF430 will not reduce the hop metric, only increase it.

The radio compares the hop metric of the Hello message received by the

radio (both RF sourced and wire sourced) to a calculated hop metric

based on duty cycle and signal strength. The largest hop metric is used.

Below is a more detailed explanation about the method used to modify

the hop metric.

M.6.1 Hop Metric Code

The HopMetric code corresponds to the following times that are seen in

PakBus Graph:

HopMetric Code

Time

0 200 msec or less

1 1000 msec

2 5000 msec

3 10000 msec

4 20000 msec

The duty cycle portion of the hop metric is:

Standby Mode

Hop Metric

<24 mA Always On 0

< 4 mA 1/2 sec Cycle 1

< 2 mA 1 sec Cycle 1

<.4 mA 8 sec Cycle 2

The signal strength portion of the hop metric is determined by:

Signal level for upper threshold of hop metric going from

2 -> 1 => 60 (-80 dBm)

Signal level for lower threshold of hop metric going from

1 -> 2 => 49 (-94 dBm)

These two hop metrics are added together to give the composite hop

metric. For example, if the radio was always ON, and signal level >60,

the composite hop metric would be 1 (1000 msec). If the radio was

doing the ½ sec Cycle, and signal level was <49, the composite hop

metric would be 3 (5000 msec).

The signal strength that is used for the hop metric is averaged, and

incorporates hysterisis so that it neither changes quickly nor

sporadically. The radio keeps track of the averaged signal strength for

10 individual neighboring nodes (30 for the RF Router mode).

M.7 RF Router

RF401 or RF430 radios using PakBus Node protocol can be set as a

PakBus RF router. In this mode, the radio is not attached to any

datalogger or PC; it is ONLY a RF router. The radio will maintain a

routing table, discover additional nodes, and route PakBus packets

based on its routing table. The radio will also have a Beacon Interval,

Hello List, Verify Interval, and Central Router setting. These settings

function as they do in the CR1000. The default settings are:

M-3

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