Bryant 548J - Manual (Page 33)

33
RTU--MP CONTROL SYSTEM
The RTU--MP controller, see Fig. 46, provides expanded
stand--alone operation of the HVAC system plus
connection and control through communication with
several Building Automation Systems (BAS) through
popular third--party network systems. The available
network systems are BACnet MP/TP, Modbus and
Johnson J2. Communication with LonWorks is also
possible by adding an accessory interface card to the
RTU--MP. Selection of the communication protocol and
baud rate are made at on--board DIP switches.
Bryant’s diagnostic display tools BACviewer6 Handheld
and Virtual BACview (loaded on a portable PC) must be
used with the RTU--MP controller. Connection to the
RTU--MP board is at the J12 access port, see Fig. 46.
The RTU--MP control is factory--mounted in the 548J
unit’s main control box, to the left of the CTB. See Fig. 47
(or Fig. 48). Factory wiring is completed through
harnesses connected to the CTB. Field connections for
RTU--MP sensors will be made at the Phoenix connectors
on the RTU--MP board. The factory--installed RTU--MP
control includes the supply--air temperature (SAT) sensor.
The outdoor air temperature (OAT) sensor is included in
the FIOP/accessory EconoMi$er 2 package.
Refer to Table 14, RTU--MP Controller Inputs and Outputs
for locations of all connections to the RTU--MP board.
C07129
Fig. 46 -- RTU--MP Multi--Protocol Control Board
548J