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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.
PROTOCOL
DS8
BACnet MS/TP
Unused
(Master)
Modbus
Unused
(Slave)
N2
Unused
(Slave)
LonWorks
Unused
NOTE:
DS = Dip Switch
BACnet MS/TP SW3 example shown
Baud Rate Selections
BAUD RATE
9600
19,200
38,400
76,800
Fig. 51 − RTU Open Controller Address Switches
SW3 Protocol Selection
DS7
DS6
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
DS2
DS1
OFF
OFF
ON
OFF
OFF
ON
ON
ON
Fig. 50 − RTU Open Controller SW3 Dip Switch Settings
C10815
The RTU Open controller 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. 50
and 51 for protocol switch settings and address switches.
The third party connection to the RTU Open controller is
through plug J19. See Fig. 52 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, third party wiring, and
networking.
DS5
DS4
DS3
OFF
ON
OFF
ON
ON
OFF
OFF
ON
ON
OFF
ON
OFF
Fig. 52 − Network Wiring
32
DS2
DS1
Select Baud
Select Baud
Select Baud
Select Baud
OFF
OFF
OFF
ON
C07166
C10816
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