BB2-7030 User Guide – Rev. 1.0
Page 48
Rule number simply tells you where you're at on the list of OID maps. Click "next" and "prev" to
scroll through the list. To advance directly to a specific map, enter the desired number in the
"Showing" box, then click Update.
Rules entered on this page only write data to remote devices. Go to the Client Read Map to read
data from those devices. The full parameter set is different for read versus write.
An abbreviated version of a list of rules is shown on this page. Any of the parameters shown may
be changed here and registered by clicking the Update button. To view and/or modify the
complete set of parameters, click on the map number in the left most column.
Data from the local object given will be multiplied by the scale factor before being written. For
each remote OID to be written, enter the register type, format, number, and location (device).
The names in the device list are defined in the Devices page. The name is optional and used only
for display purposes.
Important note about data type: SNMP does not have a universally accepted representation for
floating point. The most commonly used means of representing real data is scaled integers, and
this method is supported by BB2-7010. IEEE 754 is not recognized as an SNMP standard and is
not used. X.690 defines an encoding for real data, but it is inefficient and little used. A common
recommendation is to use ASCII string representation of floating point data, and this method is
supported by BB2-7010 (Octet String Num). Another known but application specific
implementation is the ASN OPAQUE FLOAT used in netsnmp applications. This method is also
supported by BB2-7010 but should be tested to confirm compatibility.
Selecting "none" for remote type effectively deletes the rule even though it will still appear in the
list until deleted. Unused rules at the end of the list will always show none as the type.
Local Object is internally a coded number consisting of BACnet object type multiplied by 1000,
then added to the object number starting from #1. These are translated into abbreviations that are
easy to interpret on the web page as follows:
