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 (SWl and SW2) are used to
set the board's network address. See Fig. 67 and 68 for
protocol switch settings and address switches. The 3rd
party connection to the RTU Open is through plug J19.
See Fig. 69 for wiring.
NOTE: Power must be cycled after changing the SW1-3
switch settings.
Refer to the RTU Open v3 Integration Guide for more
detailed information on protocols, 3rd party wiring, and
networking.
PROTOCOL
BACnet MS/TP
(Master)
Modbus
(Slave)
N2
(Slave)
LonWorks
DS8 DS7 DS4 DS1
Unused OFF ON Select Baud
Unused OFF ON Select Baud
Unused OFF ON OFF
Unused ON ON ON
NOTE:
DS = Dip Switch
BACnet MS/TP SW3 example shown
DS3
OFF
OFF
ON
OFF
Baud Rate Selections
BAUD RATE DS2 DSl
96OO OFF OFF
19,2OO ON OFF
38,4OO OFF ON
76,800 ON ON
SW3 Protocol
DS6
OFF
OFF
OFF
ON
Selection
DS5
OFF
ON
OFF
OFF
O_t_ S_ t_ N;STP
_Jnu_d Pert (m_r}
DS2
Select Baud
Select Baud
OFF
OFF
3&4_
_Jd
Fig. 67 - RTU Open SW3 Dip Switch Settings
C07166
Fig. 68 - RTU Open Address Switches
C10815
Fig. 69 - Network Wiring
C10816
38
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