ICP DAS USA PMC-523 Series, Руководство пользователя

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ICP DAS PMC-523x/PMC-224x/PMD Series User Manual
324
Appendix VII
：
The JSON format for the communication with IoT
Platform
PMC/PMD supports the functions to publish the JSON format messages to
Microsoft Azure and IBM Bluemix IoT Cloud platforms, and also subscribe/receive
the JSON format messages from IoT Cloud platform to change the value of the
output channel of I/O modules or power meter modules that are connected to
PMC/PMD. The following lists the detailed information of JSON format message
with PMC/PMD.

Message format
{
"msg_type" :
" CHANNEL_UPDATE " The "CHANNEL_UPDATE"
type of message indicates the
message published by
PMC/PMD to inform IoT
Cloud platform the update of
the power data or I/O channel
data.
" CHANNEL_OUTPUT " If PMC/PMD receives the
message in the type of
"CHANNEL_OUTPUT", then
PMC/PMD will perform the
task to change the value of the
output channel.
"if_type" : It indicates the connection interface between PMC/PMD and
the power meter or I/O module where the channel resides. The
following table shows the code and the interface it represents.
0 XV-Board
1 COM Port
2 Ethernet
"com_port" : "3" indicates the connection interface between PMC/PMD and
the power meter or I/O module is COM port 3. "4" indicates
the connection interface between PMC/PMD and the power
meter or I/O module is COM port 4. If the connection
interface is XV-Board or Ethernet, please ignore this field.