Carrier 50HCQA - Manual (Page 31)

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Input 8 or 9 is recommended for easy of installation. Refer
to Fig. 47 and Fig. 49 for wire terminations at J5.
Remote Occupancy: The remote occupancy accessory is
a field--installed accessory. This accessory overrides 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. 47 and Table 8 for wire
terminations at J5.
Power Exhaust (output): Connect the accessory Power
Exhaust contactor coil(s) per Fig. 55.
Power Exhaust
J11-3
C
TAN
GRA
PEC
CTB
THERMOSTAT
C08464
Fig. 55 -- RTU--MP Power Exhaust Connections
Space Relative Humidity Sensor: The RH sensor is not
used with 50HCQ models at this time.
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 used to set the
board’s network address. See Fig. 56 for the switch setting
per protocol. The 3rd party connection to the RTU--MP is
through plug J19.
NOTE: Power must be cycled after changing the SW1--3
switch settings.
Refer to the RTU--MP 3rd Party Integration Guide for
more detailed information on protocols, 3rd party wiring,
and networking.
SW3 Protocol Selection
PROTOCOL DS8 DS7 DS6 DS5 DS4 DS3 DS2 DS1
BACnet MS/TP
(Master)
Unused OFF OFF OFF ON OFF Select Baud Select Baud
Modbus
(Slave)
Unused OFF OFF ON ON OFF Select Baud Select Baud
N2
(Slave)
Unused OFF OFF OFF ON ON OFF OFF
LonWorks Unused ON ON OFF ON OFF OFF OFF
NOTE:
DS = Dip Switch
BACnet MS/TP SW3 example shown
Baud Rate Selections
BAUD RATE DS2 DS1
9600 OFF OFF
19,200 ON OFF
38,400 OFF ON
76,800 ON ON
C07166
Fig. 56 -- RTU--MP SW3 Dip Switch Settings
50H
C
Q
A