How do I decode a 4-20mA Current Loop Sensor Uplink Event?

How do I decode a 4-20mA Current Loop Sensor Uplink Event?

The 4-20mA Current Loop Sensor will generate events if the measured value rises above or falls below the configured thresholds, rate of change, or is set for periodic reporting.

 

Byte 0: 7-4

Byte 0: 3-0

Byte 1

Byte 2 

 

Byte 3 and Byte 4

Protocol version

 

 

(4 bits)

Counter

 

 

 

(4 bits)

4-20mA Current Loop Message Type Code

 

 

0x11

4-20mA Analog Measurement Event Payload

 

 

(0x03 in the example below)

Analog Current measurement

 

 

(0x021F in the example below)

 

 

 

 

Protocol Definition

              First 4 bits are defined by Radio Bridge for the protocol

              Next 4 bits are a counter that goes from 0 to F (Hex) and repeats

             

Message Type

              0x11 represents the 4-20mA Analog Measurement Message Type

 

4-20mA Analog Measurement Sensor Event

              Byte 2                         Description

                  0x00                              Periodic Report

                  0x01                              Current has risen above upper threshold

                  0x02                              Current has fallen below lower threshold

                  0x03                              Report on change increase 

                  0x04                              Report on change decrease

 

Byte 3

              Current measurement in units of 10uA

 

Example of 4-20mA Current Loop Sensor Event Message

 

10 11  03 02 1F

 

1                                 Protocol Version (currently always 0x1)

0                                 Packet Counter (increments by 1 each message and wraps from 0xF to 0x0)

11                               4-20mA Event Type (0x11)

03                              4-20mA Current Loop Event (Report on Change Increase = 0x03)

021F                           Current measurement in units of 10uA (0x021F = 543uA)

 

 

The Radio Bridge Console will generate the following output for this message:

4-20mA Current Loop Event: Report on change increase

Current Measurement: 0.543 mA

 

 

 

 

 

 

 



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