ONICON System-10 N2 - Manual (Page 10)

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System-10-N2 BTU Meter Installation and Operation Guide 05/14 - 0655-5 / 18322
Page 10
1.5 RS485 BIASING AND TERMINATION
The ONICON System-10-N2 does not provide biasing voltage or termination to the RS485
network. A 120W termination resistor should be used when the meter is installed at the end of
the line.
1.6 NETWORK ADDRESSING
Before the System-10 can communicate on the N2 network, the appropriate device address must
be programmed into the meter. The N2 network address for ONICON System-10 BTU Meters may
be set to any address from 001 to 255. This address is set at the Btu meter. Section 1.6.1 details
the procedure for changing this address.
1.6.1 Changing the Device Address
Every ONICON System-10 is individually programmed at the factory with application
specific data provided by the customer during the ordering process, and this may include
network addressing information. If the device address information was provided, the
meter will be programmed with that number. If no address is provided, ONICON Btu
meters are programmed with a default address of 017. The address may be changed at
the System-10 using the procedure outlined in the table below.
STEP ACTION REACTION COMMENT
0
Obtain a device address from the
network administrator.
The device address is
a three digit number
between 001 - 255,
excluding zero.
1
With the meter running, open
the front panel and locate switch
DEV ADD/PROG ENAB. Press
DEV ADD/PROG ENAB and then
release it.
None
The DEV ADD/PROG ENAB
is located on the heat
computer board. (See
appendix page A-1.)
2 Close the front panel.
3
Press the PROGRAM button. (If
you do not press the PROGRAM
button, the meter will revert to the
RUN mode after 5 minutes.)
The System-10 changes
to PROGRAM mode and
the DEVICE ID page will
appear with the first digit
of the address flashing.
The PROGRAM button is on
the front panel.