Bryant 548J*14D Communication Wiring - Protocols, RTU-MP Power Exhaust Connections, General

Power Exhaust (output): Connect the accessory Power Exhaust contactor coil(s) per Fig. 46.

Power Exhaust
	PEC	GRA
					J11-3
				CTB
				THERMOSTAT
			TAN		C
					C10362

Fig. 46 - RTU-MP Power Exhaust Connections

Space Relative Humidity Sensor - The RH sensor is not used with 548J*14D 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. 47 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.

Local Access —

BACview6 Handheld: The BACview6 is a keypad/display interface used to connect to the RTU-MP to access the control information, read sensor values, and test the RTU, see Fig. 48. This is an accessory interface that does not come with the MP controller and can only be used at the unit. Connect the BACview6 to the RTU-MP’s J12 local access port. There are 2 password protected levels in the display (User and Admin). The user password is defaulted to 0000 but can be changed. The Admin password is 1111 and cannot be changed. There is a 10 minute auto logout if a screen is idle. Contact your Bryant applications engineer for details on navigation and screen content.

Virtual BACview: Virtual BACview is a freeware computer program that functions as the BACview6 Handheld. The USB Link interface (USB-L) is required to connect a computer to the RTU-MP board. The link cable connects a USB port to the J12 local access port. This program functions and operates identical to the handheld.

RTU-MP Troubleshooting —

Communication LEDs The LEDs indicate if the controller is speaking to the devices on the network. The LEDs should reflect communication traffic based on the baud rate set. The higher the baud rate the more solid the LEDs will appear.

548J*14D

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. 47 - RTU-MP SW3 Dip Switch Settings

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