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Installation
Communications wiring - protocols
Protocol Overview
Protocols are the communication languages spoken by the control devices. The main purpose of a protocol is to
communicate information in the most efficient method possible. Different protocols exist to provide specific
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 WSHP Open is an effective solution to minimize the amount of
controllers that you may need to change in order to communicate with different types of protocols.
You can set the controller to communicate 1 of 4 different protocols:
•
BACnet MS/TP
•
Modbus
•
N2
•
LonWorks
The default setting is BACnet MS/TP. Switch 3 (SW3) on the board sets protocol and baud rate. Switches MSB
(SW1) and LSB (SW2) set the board's network address. See table below for specific switch settings. The third
party connects to the controller through port J19 for BACnet MS/TP, 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 MSB (SW1) - LSB (SW2) settings or connecting the LonWorks Option
Card to J15.
SW3 Switch Settings Table
Protocol
BACnet MS/TP
(Default)
Modbus
N2
Lonworks
Baud Selection Table
Baud Rate
9,600
19,200
38,400
76,800
WSHP Open v3
DS8
Master Unused
Slave
Unused
Slave
Unused
Unused
SW3/DS2
Off
On
Off
(Default)
On
Protocol Selection
DS7
DS6
DS5
DS4
Off
Off
Off
On
Off
Off
On
On
Off
Off
Off
On
On
On
Off
On
SW3/DS1
Off
Off
On
On
Baud Rate
DS3
DS2
DS1
Off
Select Baud
Select Baud
Off
Select Baud
Select Baud
On
Off
Off
Off
Off
On
5
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