Kurz Instruments Inc. December 13, 2007
360210-AH Rev.A 504/534FTB Installation AH - 14
described in the previous paragraph. You may want to put a short cut to this program in
your Start menu.
RS-485/Modbus
The RS-485 interface is half duplex and supports baud rates of 9600, 14400, 19200,
38400 and 57600. Wiring is a shielded twisted pair, two signal lines and one shield
connection. The signal lines can be connected in any order provided the 485 bus is
biased so the flow meter knows which signal is positive. See 342038 for a wiring
example of this. A junction tee (see www.turck.com ) between the network bus and
instrument drop is recommended so instruments may be removed for service without
interruption to the network bus.
Desk computers and laptops can interface to the
RS-485 devices using a USB dongle converter.
We recommend the industrial version from
EasySync, available from Kurz (PN 700491) or
the manufacture. This device is optically
isolated, screw terminal interface with metal
enclosure and status LEDs, with a biased bus
allowing the auto-polarity detection to work. .
EasySync’s devices have a known issue with the Microsoft Windows Vista operating
system. Contact EasySync at support@easysync-ltd.com for help in installing the
device.
The Modbus interface must be set for device address, protocol, baud rate, and byte
order. See 342042 for more information on how to configure or verify Modbus
communications settings. Once properly connected and configured, you will not only see
the yellow LED flash for RS-485 receive activity, you will see the green LED flash for
transmit or response of the flow transmitter. The MFT B-Series unit has two red LEDs
used for receive and transmit, respectively. The full protocol specification and register
variable map is found in the serial communications
section of the manual.
5-Wire Sensor Connections
For the TS version you must field install the wiring between the sensor and its electronics
enclosures. In addition to the field wiring diagram 342038 you need to refer to 342039 for
the TS part. This is a 5-wire connection which must use quality wire whose wire
resistance is less than 1 Ω per wire. Each wire must be matched within 0.01 Ω or 10 mΩ
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