ONICON System-10 Dualnet User Manual

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System-10 Dual Network Interface Installation Guide 05/14 - 0972-1

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1.6.2 Biasing and Termination

The ONICON System-10 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 System-10 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 System-10 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.

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