ICP DAS USA U-7500 Series, User Manual

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OPC UA I/O Series User Manual V4.0 – ICP DAS
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Appendix B. MQTT JSON Format of the UA I/O Series
MQTT JSON Example & Format Descriptions:
{
"Variable" : [ {
"Name" : "Bool_R[0]",
"Attribute" : "R",
"Datatype" : "Bool",
"Value" : 0,
"Quality" : "Uncertain"
}, {
"Name" : "Short_R[0]",
"Attribute" : "R",
"Datatype" : "Int16",
"Value" : 0,
"Quality" : "Uncertain"
}, {
"Name" : "Short_R[1]",
"Attribute" : "R",
"Datatype" : "Int16",
"Value" : 0,
"Quality" : "Uncertain"
}, {
"Name" : "Short_R[2]",
"Attribute" : "R",
"Datatype" : "Int16",
"Value" : 0,
"Quality" : "Uncertain"
}, {
"Name" : "Short_RW[2]",
"Attribute" : "RW",
"Datatype" : "Int16",
"Value" : 0,
"Quality" : "Uncertain"
} ]
}
Name Descriptions
Variable The array name of JSON.
Its structure includes several
member data as below.
Name The member name of the array
element
Attribute The member attribute of the array
element:
“R” : can read
“W” : can write
”RW” : can read and write
Datatype The member’s data type of the
array element:
"Bool"
"Int8"
"UInt8"
"UInt16"
"Int16"
"UInt32"
"Int32"
"UInt64"
"Int64"
"Float"
"Double"
"String"
Value The member’s current value of the
array element
Quality The member’s current status of
the array element:
"Uncertain"
"Good"
"Bad"