ONICON D-100 BACnet - Manual (Page 23)

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D-100 Display Module BACnet Installation and Operation Guide 05/14 - 0635-6 / 18341
Page 23
3.1 TROUBLESHOOTING
Reported Problem Possible Solutions
Device will not communicate
with the network controller. • Is the receive LED flashing on the network board? This
LED will flash whenever there is traffic on the network. If
the LED is not flashing, look for an open network cable.
• 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.)
• 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.)
• The Baud rate setting must match the network Baud rate.
(See section 1.5.1 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 D-100.
• The maximum number of devices allowed on an RS485
network segment without a repeater is 32. Adding more
than 32 devices to a single segment may reduce the
transceiver output voltage to a level that is too low to be
distinguished from background noise on the cable.
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.)
SECTION 3.0: NETWORK TROUBLESHOOTING TIPS