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RTU-MP Controller
5
Communications wiring - protocols
Protocol Overview
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. Different protocols do
not change the function of the controller, but, they typically require the owner to change systems or
components in order to change from one protocol to another. The RTU-MP is an effective solution to minimize
the amount of equipment change necessary to communicate with different protocols. Currently, the four most
common protocols are: BACnet, Modbus, N2, and LonWorks.
The RTU-MP can be set to communicate using one of four different protocols: BACnet, Modbus, N2, or
LonWorks. The default setting is BACnet. 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 the table below for the
specific switch settings. The 3rd party connection to the RTU-MP is through port
J19
for BACnet, Modbus, and
N2, and through
J15
for the LonWorks Option Card.
NOTES
○
Changing protocol requires no programming or point assignment by the installer or operator.
○
Power must be cycled after changing the
SW1
-
SW3
settings.
SW3 Switch Settings Table
Protocol Selection
Baud Rate
Protocol
DS8
DS7
DS6
DS5
DS4
DS3
DS2
DS1
BACnet MS/TP
(Default)
Unused
Master
Off
Off
Off
On
Off
Select
Baud
Select
Baud
Modbus
Unused
Slave
Off
Off
On
On
Off
Select
Baud
Select
Baud
N2
Unused
Slave
Off
Off
Off
On
On
Off
Off
Lonworks
Unused
On
On
Off
On
Off
Off
On
Baud Selection Table
Baud Rate
SW3/DS2
SW3/DS1
Off
9,600
Off
On
19,200
Off
Off
38,400
On
76,800
On
(Default)
On
Installation
Summary of Contents for RTU-MP
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