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1.1.4.1 Universal commands
These are commands understood by all devices, and to which all devices give the same reply.
0. Read unique identifier
the addressed device provides the following in it’s reply:
Manufacturer’s code (provided by the HART foundation, see appendix)
Product code (provided by manufacturer, see chapter 5.2.1.1)
Universal command table code ( HART 5 )
Device ID
Software version
Hardware version
Device status
1. Read primary variable
This reads the digital value (Primary Value) that the transmitter sends to the 4…20 mA output.
The unit also belongs to the numeric value.
2. Read output current in mA and in percent of range
3. Read output current and four dynamic variables
The primary, secondary, tertiary and quaternary variables are transmitted.
The secondary, tertiary and quaternary variables are specified in the manual of the given device.
6. Modify (short) polling address (Write polling address)
If there is more than one device in the loop (multidrop), each device must have a different address.
In this case, the address should be configured before connecting the device to avoid errors caused by devices with the same addresses replying at the same
time.
11. Read unique device identifier associated with tag
Devices are queried based on their short TAG and not based on their addresses.
As a result, there must not be more than one device with exactly the same short TAG.
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