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ICC
11.2
A.O. Smith PDNP Master
11.2.1
Overview
The gateway supports the A.O. Smith Proprietary Device Network (PDN) master
protocol on its RS-485 port. This protocol is primarily used in A.O. Smith Boiler
products. Some notes of interest are:
•
Requests are fully configurable through service objects.
•
Network characteristics are fixed at 19200 baud, 8 data bits, 1 start bit, 1
stop bit and no parity.
11.2.2
PDNP Service Objects
The PDNP master driver uses service objects to describe what services the
gateway should perform. For each service object, the gateway will continually
read the parameters defined within the service object from the designated slave,
storing the value(s) in the database (if the read function is enabled). When data
in the database changes where the parameters are mapped, a write request is
generated to the designated slave notifying it of the changed parameter value(s)
(if the write function is enabled). For more information on configuring PDNP
service objects, refer to section 8.8.2.2.
