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(Новая страница: «Let's subscribe to the status messages of the first relay connected via RS-485 of the WB-MRM2 relay module: <syntaxhighlight lang="bash"> root@wirenboard:~# mosqu…») |
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===Pressing a button in the web interface and switching the relay on the external module=== | ===Pressing a button in the web interface and switching the relay on the external module=== | ||
[[File:Web-devices-serial.png|400px|thumb|Web interface after pressing relay 1 on the relay module [[WB-MRM2/en| MRM2]] CONNECTED via RS-485]] | [[File:Web-devices-serial.png|400px|thumb|Web interface after pressing relay 1 on the relay module [[WB-MRM2/en| MRM2]] CONNECTED via RS-485]] | ||
Suppose that the relay module WB-MRM2 is connected to the controller via the [[RS-485/en| RS-485]] bus. The user presses the relay button in the web interface and switches it on. Let's see how the command from the web interface gets to the external module: <pre>/devices/wb-mrm2_130/controls/Relay 1/on 1</pre>It means that the device WB-MRM2 with the address ''130'' must transfer Relay 1 to the state of the logical | Suppose that the relay module WB-MRM2 is connected to the controller via the [[RS-485/en| RS-485]] bus. The user presses the relay button in the web interface and switches it on. Let's see how the command from the web interface gets to the external module: | ||
#After clicking the button, the web interface places the following message in the queue:<pre>/devices/wb-mrm2_130/controls/Relay 1/on 1</pre>It means that the device WB-MRM2 with the address ''130'' must transfer Relay 1 to the state of the logical 1 - "on". | |||
#[[Драйвер wb-mqtt-serial/en|The wb-mqtt-serial driver]] responsible for this hardware function receives this message (it is subscribed to all messages related to RS-485 devices) and sends a command to turn on the first relay via the RS-485 bus to the relay module. | #[[Драйвер wb-mqtt-serial/en|The wb-mqtt-serial driver]] responsible for this hardware function receives this message (it is subscribed to all messages related to RS-485 devices) and sends a command to turn on the first relay via the RS-485 bus to the relay module. | ||
#The WB-MRM2 relay module receives a command from the controller, switches the relay and sends back a notification ("Relay 1 is on"). | #The WB-MRM2 relay module receives a command from the controller, switches the relay and sends back a notification ("Relay 1 is on"). | ||