Carrier 50HCQA Communication Wiring - Protocols, RTU-MPPower Exhaust Connections, General, J11-3

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

afield-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
	PEC		TAN		J11-3
				CTB
				THERMOSTAT
		GRA			C
					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.

50HCQA

SW3 Protocol Selection

PROTOCOL	DS8	DS7	DS6	DS5	DS4	DS3	DS2	DS1
BACnet MS/TP	Unused	OFF	OFF	OFF	ON	OFF	Select Baud	Select Baud
(Master)
Modbus	Unused	OFF	OFF	ON	ON	OFF	Select Baud	Select Baud
(Slave)
N2	Unused	OFF	OFF	OFF	ON	ON	OFF	OFF
(Slave)
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

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