AAON Orion Control Systems MiniLink PD 5, Техническое руководство

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MiniLink PD 5 Technical Guide
4
OVERVIEW
Overview & Features
Features
The MiniLink PD 5 utilizes token passing communication ar-
chitecture. The MiniLink PD 5 is designed to serve as the local
communications loop master. This means that it is responsible
for sending the token to all the controllers on the local commu-
nications loop.
Network communications are RS-485 type operating at 19,200 or
115,200 baud. Local communications are also RS-485 type and
operate at 9600 or 57,600 baud. See
Figure 2, page 6.
The MiniLink PD 5 is factory default set to low speed. The baud
rate is set with dipswitches 7 & 8. See
Figure 3
,
page 7
.
Overview
The MiniLink PD 5 is an RS-485 communications device that
is used to integrate multiple local RS-485 communication loops
into an RS-485 network communications system. See
Figure 1
,
page 5
for dimensions.
The MiniLink PD 5 is required on the Orion Control system to
separate local loops. Up to 60 MiniLink loops can be on a system.
Local loop terminals of the MiniLink PD 5 are designed to con-
nect to controllers that are daisy-chained together on its RS-485
local communications loop.
Network RS-485 loop terminals on the MiniLink PD 5 are used
to daisy-chain multiple MiniLinks back to a CommLink 5 to
form a network communications loop. This provides for a fully
networked RS-485 communications system.
The MiniLink PD 5 is required for VAV systems to allow infor-
mation to be shared between the HVAC Unit Controller and the
VAV/Zone BACnet
®
Controllers (VAVZB). It is also required
for zoning systems to facilitate voting of the zones to determine
the HVAC units heating and cooling mode of operation. It also
provides tenant-logging capabilities.