ONICON System-10 BACnet User Manual

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System-10-BAC Network Interface Installation Guide 04/14 - 0652-8 / 16957

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1.5.2 Biasing and Termination

The ONICON System-10 does not provide biasing voltage to the RS485 network. A jumper

selectable 120W termination resistor is provided as show below. The termination resistor

should only be used when the display 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

1.6 NETWORK ADDRESSING

Before the System-10 can communicate on the BACnet network, the appropriate addresses

must be programmed into the Btu meter.

For MS/TP networks the required addresses are the MAC address and the device instance

number. Both must be assigned to the display. Section 1.6.1 details the procedure for changing

both the MAC address and the device instance number.

For IP networks, an IP address and a device instance number must be assigned to the meter.

In addition, managed IP networks may require a gateway address. The procedure for assigning

the device instance number is detailed in section 1.6.1. Procedures for entering the IP address

and the gateway address are detailed in sections 1.6.2 and 1.6.3. Both require the use of the

RUInet utility program and a PC with an Ethernet card and an available port.

1.6.1 Changing the MAC Address and Device Instance Number

To communicate with the network, the BACnet MS/TP interface requires a MAC address

(Station I.D.) and a device instance number (Node I.D.). The BACnet/IP interface does not

require a MAC address, only the device instance number. The MAC address can be any

number from 001 – 254. 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 MAC address or the

device instance number is outlined in the table on the next page.

IMPORTANT NOTE

As per the BACnet standard, assigning a MAC address of 128 or higher will disable the
“automatically discover new devices” feature in the host software. Displays with a MAC
address of 128 or higher are slave devices and must be manually added to the network.