CHAPTER 7: COM OPTION B: BACNET MS/TP WITH MODBUS TCP/IP CONFIGURING COM OPTION B: BACNET MS/TP WITH MODBUS TCP/IP
EPM 2200 POWER METER – INSTRUCTION MANUAL 7–9
• Modbus TCP Port for TCP to RTU Router - the default port is 502. As long as this
field is not 0, the router is enabled, which lets the meter communicate with
Modbus TCP/IP Master devices.
• Enable BACnet/IP Control Objects - Check this box to allow direct access to
Modbus registers. If enabled, the Control Objects are represented by the following
three Analog-Value BACnet Objects:
• 500001 is a writeable object called MOD_ID_TARGET (“target device
identifier to be read/written”). Since the meter has a hard-coded Modbus
address of “1” only this value needs to be entered before first access to a
Modbus register. The default = -1.0. -1.0 also means do not execute
#500003 (neither read nor write).
• 500002 is a writeable object called MOD_REGISTER (“register to be read/
written”); for example, “1000” to access the first register of volts A-N. The
default = -1.0 after any reboot. -1.0 also means do not execute #500003
(neither read nor write).
• 500003 is a readable/writeable value called MOD_VALUE (“value to be read
from or written to select register”).
The MOD_REGISTER resets with -1.0 after each Read/Write (whether or not
successful), from/to MOD_VALUE with valid MOD_ID_TARGET and
MOD_REGISTER. MOD_REGISTER will also be set to -1.0 30 seconds after it is
written to.
7. Click OK to process your changes. You will see the following message
You still need to activate the configuration for the changes to take effect.
Note
You can change all settings back to their default by clicking the Restore Default button at
the bottom of the page.
8. Click MS/TP Settings on the left side of the webpage to see the page shown below.
Use this page to make any necessary changes to your MS/TP settings.
You can change the following fields:
• Baud Rate - select the baud rate you need from the pull-down menu.
• This station (MAC) - the MAC address of this MS/TP node (the EPM 2200 meter).
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