Onicon FT-3200 - Section 3.0 Network Troubleshooting Tips; Troubleshooting

FT-3200 MODBUS TCP/IP SUPPLEMENT
ON I CON
Flow and Energy Measurement
11451 Belcher Road South • Largo, FL 33773 • USA • (P) 727.447.6140 • (F) 727.442.5699 • onicon.com
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.
• The RS485 network cable connections are polarity sensitive and must
be connected the same way on every device (i.e. + to + and - to -).
• The Baud rate setting must match the network Baud rate.
• 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 FT-3200.
• 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. This resistor should only be used if the meter
is the last device on the network cable.
Network communications are disrupted
whent he 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 -).
• 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.
• 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 FT-3200.
Device will not communicate with
the MODBUS TCP/IP controller
• Conrm that the network cable connector (RJ45) is fully seated in the
socket.
• Conrm that the IP address, subnet mask and gateway addresses are
correct.
• Conrm that the MODBUS network port is set to 502.