34
CONNECTING BACNET
BACNET MS/TP NETWORK ADDRESS
The iCOMM-CM defaults to a BACnet MS/TP network address of 80. This is the base
address with all the connected water heating appliances having MS/TP addresses equal to
the base a its iCOMM™ network addresses. The iCOMM™network addresses can
be viewed (see Assign Network Addresses on page 26) with the control system display on
each appliance. However, with only one tank type water heater connected to the CM
(communication module) the iCOMM™ network address will not be visible on the
appliance’s control system display but will default to 1.
The iCOMM™ network addresses for all connected water heating appliances and the
BACnet MS/TP base network address (and software revision) for the CM can be viewed on
the CM’s LCD screen. Pressing the Display Button repeatedly will cycle through the various
information screens the CM can display. See Figure 22 on page 33, Figure 23 below and the
Display Button Operation section on page 30.
Changing BACnet MS/TP Network Address
Setting the BACnet MS/TP network base address of the CM to an address other than its
default of 80 requires the CM to be plugged into an Ethernet LAN (Local Area Network) with
a router that will assign it an IP address automatically (DHCP). It also requires a PC
(personal computer) capable of running telnet (commonly available on most PCs) on the
same LAN.
If not using the web interface (BMS mode only), or no local Ethernet connection is available,
an inexpensive (usually < $50) off the shelf router, will work. These are available at most
stores that sell computer hardware will do.
1 Turn off power to the CM; unplug the 5 VDC round power supply plug from the 5 VDC socket on
the CM - see Figure 22 on page 33.
2 Connect both the CM and the PC into the same LAN (or router). Make sure to use the “LAN
PORT” (Ethernet) connector on the CM - see Figure 21 on page 30.
3 Restore power to the CM plug the 5 VDC round power supply plug into the 5 VDC socket on the
CM.
Figure 23
iCOMM™ system CM (communication module)
CM’s BACnet Information Screen
