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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.
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. 59 for the switch
setting per protocol. The 3rd party connection to the RTU
Open is through plug J19.
NOTE: Power must be cycled after changing the SW1- - 3
switch settings.
Refer to the RTU Open Controller Integration Guide
(Catalog No. 11- - 808- - 428- - 01) for more detailed information
on protocols, 3rd party wiring, and networking.
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
SW3 Protocol Selection
DS7
DS6
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
DS2
DS1
OFF
OFF
ON
OFF
OFF
ON
ON
ON
Fig. 59 - - RTU Open SW3 Dip Switch Settings
Local Access —
6
The BACview
BACview
Handheld:
interface used to connect to the RTU Open to access the
control information, read sensor values, and test the RTU,
see Fig. 60. This is an accessory interface that does not
come with the MP controller and can only be used at the
unit. Connect the BACview
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. See Form 48- - 50H- - T- - 2T, Appendix A
for navigation and screen content.
Virtual BACview is a freeware computer
Virtual BACview:
program that functions as the BACview
USB Link interface (USB- - L) is required to connect a
computer to the RTU Open board. The link cable connects
a USB port to the J12 local access port. This program
functions and operates identically to the handheld.
RTU Open 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.
DS5
DS4
DS3
OFF
ON
OFF
ON
ON
OFF
OFF
ON
ON
OFF
ON
OFF
32
6
is a keypad/display
6
to the RTU Open's J12 local
6
Handheld. The
DS2
DS1
Select Baud
Select Baud
Select Baud
Select Baud
OFF
OFF
OFF
OFF
C07166
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