ICC XLTR-1000 Instruction Manual page 114

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device instance is associated with. By default, the gateway will use dynamic
device binding if a service object is not configured to use static device binding.
Static Device Binding
Not all BACnet devices support dynamic device binding. If the gateway needs to
request data from an MS/TP slave, or an MS/TP master that doesn't support
dynamic device binding, then static device binding must be used. Static device
binding allows the user to manually define the information that the client would
normally acquire using dynamic device binding. The only additional information
the user must define is the network address of the destination device. This
feature may also be useful if the destination device instance is unknown, but the
network address of the device is known. In this case, an arbitrary device instance
may be used (as long as it does not conflict with any other device instances in
other defined service objects) and the destination address must be set to the
network address of the device.
9.3.2.4 BACnet Object Mapping
Analog Objects
Analog objects are mapped in the database as either an 8-bit, 16-bit, or 32-bit
value, depending on the data type selected. This means that each analog object
in a service object consumes one, two, or four database addresses, respectively.
For example, if a service object's starting analog output instance is "1", the
number of instances is "5", the database address is "100", and the data type is
"32-bit Unsigned", then AO 1 through 5 will be mapped at database addresses
100 through 119 (AO 1 is mapped at address 100 through 103, AO 2 is mapped
at address 104 and 107, and so on).
Binary Objects
Binary objects are mapped on a bit-by-bit basis in the database starting with the
least significant bit of the database byte. For example, if a service object's
starting binary output instance is "1", the number of instances is "12", and the
database address is "240", then BO 1 through 8 will be mapped to bit 0 through
7, respectively, at address 240, and BO 9 through 12 will be mapped to bit 0
through 3, respectively, at address 241. The remaining 4 bits in the byte at
address 241 are unused.
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