ONICON System-10 BACnet - Manual (Page 12)

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System-10-BAC Network Interface Installation Guide 04/14 - 0652-8 / 16957
Page 12
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.
i
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.