Bryant 581J Communication Wiring Protocols, General, Protocol DS8 DS7 DS6 DS5 DS4 DS3 DS2 DS1

Page 31

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 Open 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. 49 and 50 for protocol switch settings and address switches. The 3rd party connection to the RTU Open is through plug J19. See Fig. 51 for wiring.

NOTE: Power must be cycled after changing the SW1-3 switch settings.

Contact your Bryant applications engineer 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

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. 49 - RTU Open SW3 Dip Switch Settings

 

 

 

581J

C10815

Fig. 50 - RTU Open Address Switches

Fig. 51 - Network Wiring

C10816

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Contents Installation Instructions Safety Considerations Unit Dimensional Drawing Sizes Unit Dimensional Drawing Sizes 07-09 Unit Dimensional Drawing Size Unit Dimensional Drawing Size 12 Units LB KG Operating WeightsPlan for Unit Location Roof MountInspect Unit Plan for Sequence of Unit InstallationProvide Unit Support Roof Curb Details Sizes Roof Curb Details Size Field Fabricate Ductwork MAX Weight Dimensions UnitRig and Place Unit Positioning on Curb Ductwork when requiredInstall Outside Air Hood Convert to Horizontal and ConnectInstall Gas Piping Install Flue HoodEconomizer Hood and Two-Position Hood Natural Gas Supply Line Pressure Ranges Steel Pipe Spacing of Supports Nominal Diameter DimensionUnit Model Unit Size MIN MAX Gas Line Piping Condensate Drain Pan Side View Install External Condensate Trap and LineAll Units Field Power SupplyUnits Without Factory-Installed Disconnect Make Electrical ConnectionsConvenience Outlet Location Weatherproof Cover InstallationUnit Connect Primary Transformer Field Control WiringUnits without Thru-Base Connections ThermostatField Control Wiring Raceway Heat Anticipator Settings To connect the Edge Programmable Thermidistat T6-PRH01-A Perfect Humidityt Control ConnectionsPerfect Humidity Space RH Controller To connect a field-supplied humidistatOAT RRS RTU Open Multi-Protocol Control Board RTU Open Control SystemRTU Open System Control Wiring Diagram C11070 RTU Open Controller Inputs and Outputs Supply Air Temperature SAT SensorField Connections Space Temperature SPT SensorsEconoMi$er2 IAQ Sensor SEN J4-2 COM J4-3 24 VAC Relative Humidity Sensors Space or Duct Mounted Space Relative Humidity Sensor Typical WiringConnecting Discrete Inputs Duct Relative Humidity Sensor Typical WiringBaud Rate DS2 DS1 Communication Wiring ProtocolsGeneral Protocol DS8 DS7 DS6 DS5 DS4 DS3 DS2 DS1RTU Open Troubleshooting Local AccessDifferential Enthalpy Control Outdoor Air Enthalpy Control PNO 33CSENTHSWLEDs LEDs on the RTU Open show the status of certain functionsSystem WiringSmoke Detectors Return Air Enthalpy SensorSmoke Detector Locations See Completing Installation of Return Air SmokeSupply Air Return Air Detector Shipping Position Unit Wire/Fuse or Hacr Breaker Sizing Data Hacr FLA LRA Brkr Unit NOM IFM Combustion Power No P.EUnbalanced 3-Phase Supply Voltage Smoke Detectors Adjust Factory-Installed OptionsInstall Accessories EconoMi$er IV Occupancy Switch
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