Onicon F-5500 - Wiring: RS485 Modbus RTU or BACnet MS;TP; RS485 Wiring

i
IMPORTANT NOTE:
• In order to use the RS485 feature on the Model F-5500, this feature
must be chosen when the meter is ordered from the factory.
Modbus RTU and BACnet MS/TP are not available with meters
ordered with the Pulse/Alarm option.
• W1 jumper will be shipped in the open or unterminated position. It
should be in the terminated position on the last meter in the series.
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F-5500 Thermal Mass Flow Meter Manual 06/17 - 2030 / 107023 Page 35
Model F-5500
WIRING
( - ) (+)
Power
12-28VDC
4-20mA(
-
)
!
4-20mA(+) Common Tx/Rx(
-
)
Tx/Rx(+)
Tx/Rx(+)
Termination Resistor Jumper W1
Tx/Rx( - )
Communication Common
Termination Resistor Jumper (detail)
Terminated
No Termination (Open)
RS485 Wiring for RS485 Modbus RTU or BACnet MS/TP
Wiring connections are made as shown in the diagram below for Modbus or BACnet
communication.
Termination Resistor
Connect a termination resistor across the receive/transmit signals of the last device on
the communication line. To connect the 120 ohm termination resistor on the F-5500,
set jumper W1 to the TERM position.
Disconnect the termination resistor on all other external RS485 devices. The
termination resistor of the F-5500 is disconnected by setting jumper W1 to the OPEN
position.
Fig. 3.6: RS485 Wiring
Wiring: RS485 Modbus RTU or BACnet MS/TP
RS485 Wiring