Message Flow Between The Radio And Sensor; Start-Up Mode; Normal Mode - Honeywell ISA100 Gen X User Manual

Radio module

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6. Message Flow between the Radio and Sensor

Radio On Power ON (or) Restart, requests for some initial information from the Sensor board,

using stack specific message ISA100_GET_INITIAL_INFO (0x1C). The Sensor responds with

ISA100_NOTIFY_DEVICE_INFO (0x83 command) section.

The Radio sends the ISA100_GET_INITIAL_INFO message continuously once every

1.6 seconds up to 50 seconds. During this time, the Radio expects the Sensor to send at least

battery power status using ISA100_NOTIFY_POWER_STATUS (0x82) command. If the

Sensor does not send ISA100_NOTIFY_DEVICE_INFO and

ISA100_NOTIFY_POWER_STATUS packets to the Radio in 50 seconds, the Radio assumes

low battery power status and proceeds further. After 50 seconds, the Radio goes to a normal

mode condition, and then the Sensor can send ISA100_JOIN_STATUS (0x0D) command

Radio to request for join status.

In addition to initial notification of Power Status using ISA100_NOTIFY_POWER_STATUS

(0x82), the power status information have to be communicated to the Radio periodically every

minute or on a change of power supply status or both.

The Sensor has to keep querying for the join status every 30 seconds (ISA100_JOIN_STATUS:

(0x0D)) until it receives the ISA100_NOTIFY_JOIN (Join Status Data is 1) from the Radio,

informing the Sensor that the Radio has joined the network. When the Radio drops off from the

network, the Sensor is notified by the Radio by the same message ISA100_NOTIFY_JOIN

(Join Status Data is 0) and sensor resumes its request for join status.

For the Sensor to publish data over the network, it requires a contract. The Sensor has to request

for a contract using ISA100_CONTRACT_REQUEST. It takes a while for the Radio to receive

the contract details from the system manager. The Sensor keeps requesting for a contract

ISA100_CONTRACT_REQUEST every 5 seconds until the

ISA100_NOTIFY_ADD_CONTRACT message containing the contract details is received from

the Radio. Once the contract is details are received the AI and BI data will be published over the

network as per the publish period obtained from the contract details message. The Radio also

keeps the Sensor notifying the TAI time every 20 seconds and the RSSI and RSQI values

every 1 minute.

Release Independent

April 2018

ISA100 Gen X Radio Module User's Guide

Honeywell

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