ONICON D-100 N2 - Manual (Page 18)

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D-100-N2 Network Interface Installation Guide 05/14 - 0659-4 / 18344
Page 18
SECTION 3.0: NETWORK TROUBLESHOOTING TIPS
3.1 TROUBLESHOOTING
Reported Problem Possible Solutions
Device will not communicate
with the network controller. • 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.)
• 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 supervisory
controller. Shield wires must not be connected to the
RS485 connector on the D-100.
• The maximum number of devices allowed on a 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.
• RS485 cable impedance should be matched to a
termination resistor at the end of the cable. ONICON
boards do not have a resistor for termination. A resistor
should only be used if the display is the last device on
the network cable. (See section 1.5.1 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.)
• 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.)
• 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.