ONICON D-100 Dualnet - Manual (Page 13)

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D-100 Dual Network Interface Installation Guide 07/14 - 1015 Page 13
1.6.2 Biasing and Termination
The ONICON D-100 does not provide biasing voltage to the RS485 network. A jumper
selectable 120Ω termination resistor is provided as show below. The termination resistor
should only be used when the meter is installed at the end of the line.
NOTE: See Fig. 1 on page 8 to locate the termination resistor on network interface board
with auxiliary input.
Jumper selectable
120 Ohm resistor
1.7 NETWORK ADDRESSING
Before the D-100 can communicate on the BACnet and or MODBUS networks, the
appropriate addresses must be programmed into the Btu meter.
For RS485 networks a device address is required. BACnet also requires a device instance
number. Both must be assigned through the Btu meter. Section 1.7.1 details the procedure
for changing both the device address and the device instance number.
For IP networks, an IP address is required. BACnet/IP networks also require a device
instance number. In addition, managed IP networks may require a gateway address. The
procedure for assigning the device instance number is detailed in section 1.7.1. The
procedure for entering the IP address and the gateway address is detailed in section 1.7.2.
It requires the use of a PC with an Ethernet card, Ethernet cable and an available port.
1.7.1 Changing the MAC Address and Device Instance Number
To communicate via RS485, the Btu meter must be assigned a device address (Station I.D.).
BACnet MS/TP networks also require a device instance number (Node I.D.). The BACnet/
IP interface does not require a device address, only the device instance number. The device
address can be any number from 001 – 127. The device instance number can be any number
from 0 – 4,194,303. Both addresses are entered via the D-100 user interface on the front
panel of the meter. The procedure for entering or changing either the device address or the
device instance number is outlined in the table on the next page.
Unused Leave
OFF