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User Manual
BACnet Master / SNMP Agent
Document code: MN67726_ENG Revision 1.100 Page 37 of 42
Note:
The data blocks from 1 to 8 are used to read/write the entire internal BACnet arrays of the converter. The data are represented in
bytes.
Each BACnet Object defined in the section “Set BACnet Access” is associated to a specific MIB too. In order to read/write a specific BACnet
Object from SNMP, it is necessary to use the Data Block 9.
The BACnet Objects in write will be mapped consecutively to the BACnet Objects in read. So, in the MIB structure, you will find all the
BACnet Objects in read defined and then all the BACnet Objects in write. See the following example for more informations.
Example:
We have defined two Analog Inputs in the section “Set BACnet Access -> BACnet Read” and two Analog Outputs in the section “Set BACnet
Access -> BACnet Write”.
In order to read the first Analog Input (the first raw of the “BACnet in Read” table), the MIB to require will be 1.3.6.1.4.1.33118.1.1.1.4.
9
.
1
where:
-
9
: Data Block 9
-
1
: First raw of the “Set BACnet Access” section
The BACnet Objects in write will be mapped consecutively to the BACnet Objects in read, so, in this example, in order to write the first
Analog Output (the first raw of the “BACnet Write” table), the MIB to require will be 1.3.6.1.4.1.33118.1.1.1.5.
9
.
3
where:
-
9
: Data Block 9
-
3
: n + 1, where ‘n’ is the last raw’s number of the “BACnet Read” table.
Note:
It is possible to read an entire data block or only a specific byte/value (for the Data Block 1 to 8). It depends on the MIB used:
•
1.3.6.1.4.1.33118.1.1.1.4.x.0: entire data block
•
1.3.6.1.4.1.33118.1.1.1.4.x.y: value of the data block/specific byte
