Dwyer UXF3 - Manual (Page 9)

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3.2 Wiring
3.2.1 RS-485 interface
ƒ Use twisted pair cables with shield.
Recommended cable: UL2464, UL2448, etc.
ƒ The total extension length of the cable is up to 1000 m (3281 ft.). A master station and up to 31 units
can be connected per line.
ƒ Terminate both ends of the cable with 120Ÿ (1/2 W or higher) terminating resistors.
Note: See the specifications of the master for the terminating resistors of the master station unit.
ƒ The shield wire of the cable should be grounded at one place on the master station unit side.
ƒ If this instrument is to be installed where the level of noise applied to this instrument may exceed 1000 V, it is
recommended to install a noise filter in the master station side as below.
Transmission
cable
RS-232C œRS-485 Noise filter . UXF3
Master station
(PC, etc.)
Slave station (UXF3)
TRX1
TRX2
Twisted pair cable with shield
FG
RS-485 interface
or
RS-485 side of the
RS-232C RS-485 converter
Master station side
Slave station (UXF3)
Slave station (UXF3)
TRX1
TRX2
TRX1
TRX2
Bulletin F-107-UXF3-S