ONICON System-10 BACnet - Manual (Page 23)

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System-10-BAC Network Interface Installation Guide 04/14 - 0652-8 / 16957
Page 23
REPORTED PROBLEM POSSIBLE SOLUTIONS
Device will not communicate with the
network controller. (cont.) • RS485 cable impedance should be matched to
a termination resistor at the end of the cable.
ONICON boards have a jumper selectable 120
ohm resistor for termination. This resistor
should only be used if the display is the last
device on the network cable. (See section
1.5.2 of this manual for details.)
• A unique IP address is required for each
device on TCP/IP networks. Duplicate
addresses will cause multiple devices to
respond to the same poll. This will cause
some or all of the devices on the network to
quit working. (See section 1.6.2 of this manual
for details.)
• Managed IP networks may require that a
gateway IP address be programmed into the
ONICON TCP/IP device. (See section 1.6.3 of
this manual for details.)
Network communications are disrupted when the
device is connected. • The RS485 network cable connections are
polarity sensitive and must be connected the
same way on every device (i.e. + to + and
- to -). (See section 1.4.1 of this manual for
details.)
• Is the transmit LED flashing? The transmit
LED will only flash when the device is
responding to a poll. A unique address is
required for each device on the network.
Duplicate addresses will cause some or all of
the devices on the network to quit working.
(See section 1.6.1 of this manual for details.)
• A unique IP address is required for each
device on TCP/IP networks. Duplicate
addresses will cause multiple devices to
respond to the same poll. This will cause
some or all of the devices on the network to
quit working. (See section 1.6.2 of this manual
for details.)
• Shield drain connections should be daisy
chained in the same manner as the signal
cables for RS485. The shield drain wire
should be left unterminated at the end of
the cable and connected to earth only at the
network master controller. Shield wires must
not be connected to the RS485 connector on
the System-10.