ICP DAS USA PMC-523 Series, Руководство пользователя

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ICP DAS PMC-523x/PMC-224x/PMD Series User Manual
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completing the setting, click the "Add" button to add the variable. For
the message the PMC/PMD receives from IBM Bluemix is based on
JSON format, the PMC/PMD can also get the corresponding value of
the variable from the received message. Following is an example of the
message which PMC/PMD receives:
{
"Target":"door",
"Action":"open",
"Timestamp":"2016/10/17 15-17-22"
}
In this example, the “Target” and “Action” variable setting will be
performed first. Each time when the PMC/PMD receives the message,
it will retrieve the corresponding value for the “Target” and “Action”
variables from the message. The value of the variables can be used in
the evaluation criteria of IF Condition to trigger THEN/ELSE Action
for logic operation.
x After completing all settings on the IBM Bluemix Setting Page, please
click “Save” button to save the settings. After downloading the settings
to the PMC/PMD, the PMC/PMD will initiate the connection to IBM
Bluemix, and start the Publish Message/Subscribe Message mechanism
with IBM Bluemix.
9.3 MQTT Setting
PMC/PMD provides complete MQTT Client function. The MQTT Client
can connect with two (Maximum) MQTT Brokers concurrently. In order to
enable the MQTT Client function, user has to complete the setting of the
PMC/PMD’s Publish Topic and its message content with the MQTT
Brokers, and also the setting of the PMC/PMD’s Subscribe Topics. In
addition, PMC/PMD provides the “Topic Import/Export” function. It will
help user to organize the MQTT topics from different MQTT devices in an
easy way. The configuration page for MQTT setting is shown as below.
9.3.1 Broker Setting
PMC/PMD provides the setting for two (Maximum) MQTT Brokers. It
can Publish/Subscribe the Topic with the two MQTT Brokers at the same
time, and the Topic setting for the two Brokers is also independent. The
configuration page of MQTT Broker setting is shown as below: