26
On 551J units equipped with factory--installed Smoke
Detector(s), the smoke detectorcontroller implements the
unit shutdown through its NC contact set connected to the
unit’s CTB input. The FSD function is initiated via the
smoke detector’s Alarm NO contact set. The RTU--MP
controller communicates the smoke detector’s tripped
status to the BAS building control. See Fig. 38, the
RTU--MP System Controlwiring schematic.
The Fire Shutdown Switch configuration,
MENU
→
Config
→
Inputs
→
input 5, identifies the
normally open status of this input when there is no fire
alarm.

ConnectingDiscrete Inputs

FilterStatus

The filter status accessory is a field--installed accessory.
This accessory detects plugged filters. When installing
this accessory,the unit must be configured for filterstatus
by setting MENU
→
Config
→
Inputs
→
input3,5,8,or9
to Filter Status and normally open (N/O) or normally
closed (N/C). Input 8 or 9 is recommended for easy of
installation. Refer to Fig. 36 and Fig. 38 for wire
terminationsat J5.

Fan Status

The fan status accessory is a field--installed accessory.
This accessory detects when the indoor fan is blowing air.
When installing this accessory, the unit must be
configured for fan status by setting
MENU
→
Config
→
Inputs
→
input3,5,8,or9to Fan
Status and normally open (N/O) or normally closed (N/C).
Input 8 or 9 is recommended for easy of installation. Refer
to Fig. 36 and Fig.38 for wire terminations at J5.

Remote Occupancy

The remote occupancy accessory is a field--installed
accessory. This accessoryove rrides the unoccupied mode
and puts the unit in occupied mode. When installing this
accessory, the unit must be configured for remote
occupancy by setting MENU
→
Config
→
Inputs
→
input 3,
5, 8, or 9 to Remote Occupancy and normally open (N/O)
or normally closed (N/C).
Also set MENU
→
Schedules
→
occupancy source to DI
on/off. Input 8 or 9 is recommended for easy of
installation. Refer to Fig. 36 and Table 3 for wire
terminationsat J5.

PowerExhaust (output)

Connectthe accessory Power Exhaust contactor coil(s) per
Fig. 51.
Power ExhaustJ11-3CTANGRAPECCTBTHERMOSTAT
C08464
Fig. 51 --RTU--MP Power Exhaust Connections

Communication Wiring --Protocols

General

Protocols are the communication languages spoken by
control devices. The main purpose of a protocol is to
communicate information in the most efficient method
possible. Different protocols exist to provide different
kinds of information for different applications. In the BAS
application, many different protocols are used, depending
on manufacturer. Protocols do not change the function of
a controller;just make the front end user different.
The RTU--MP can be set to communicate on four different
protocols: BACnet, Modbus, N2, and LonWorks.Switch 3
(SW3) on the board is used to set protocol and baud rate.
Switches 1 and 2 (SW1 and SW2) are usedto set the
board’snetwork address. See Fig. 52 for the switchsetting
per protocol. The 3rd party connection to the RTU--MP is
through plug J19.
NOTE: Power mustbe cycled after changing the SW1--3
switchsettings.
Refer to the RTU--MP 3rd Party Integration Guide for
more detailed information on protocols,3rd party wiring,
and networking.
551J
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