ONICON System-10 MODBUS - Manual (Page 29)

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System-10-MOD Network Interface Installation Guide 05/14 - 0653-10 / 18321
Page 29
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 TCP/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.)