34
DENT
Instruments
PowerScout 24
Prepping for Field Installation
Establishing Communication Protocol
The PowerScout communicates using the BACnet MS/TP or Modbus RTU protocols via the
RS-485/Ethernet interface. To establish communication with a
RS-485
, the settings must meet the
following requirements:
The Modbus/BACnet address on the PowerScout and in the ViewPoint software must be set to
the same value.
The PowerScout meter default serial parameters are:
Parameter
Defaults
Modbus
Settings
BACnet
Settings
Baud
9600
76800
Data bits
8
8
Parity
None
None
Stop Bit
1
1
Table 9: Serial Communication Settings
The supported baud rates include 9600, 19200, 38400, 57600 (Modbus only), 76800, and 115200
(Modbus only).
NOTE:
The baud rate on the user interface (ViewPoint) must match the PowerScout setting. If these
settings differ, the PowerScout cannot communicate. There are no baud rate settings when connected
via Ethernet.
S
WITCHING BETWEEN
BAC
NET AND
M
ODBUS
M
ODE
Changing Communication Mode Using
ViewPoint
Using the Comms Setup tab in ViewPoint is the preferred way to change communications modes
between Modbus and BACnet.
Note:
The baud rate and serial settings may need to change between Modbus and BACnet. Setting
address switches to “00” will set the unit in Modbus protocol, 9600 baud rate.
If communication fails, see the section
Changing Baud Rate or Communication Mode using Address
Switches (between Modbus and BACnet)
on the next page.