Serial Line - Elis FLONET FN20xx.1 Series Design, Assembly And Service Manual

Design, Assembly and Service Manual
Page 40 of 69
Electromagnetic flowmeter FLONET FN20xx.1
ELIS PLZEŇ a. s.

7.1.6. Serial line

The meter is equipped with a serial communication interface intended for servicing purposes. In the standard
configuration, the USB port is implemented. On request, the flowmeter can be equipped with galvanically
isolated RS-485 port.
Serial port USB
This port is accessible through USB type B connector. Connection to the computer is facilitated by means of
a USB cable type A connector at one end and USB type B connector at the other end.
The USB port is not galvanically isolated from the other meter circuits. It is primarily intended for servicing
purposes, not for a permanent operation.
Serial port RS-485
The RS-485 is an optional port of the flowmeter. It is galvanically isolated from the other meter circuitry and
allows for a connection of up to 31 flowmeters to a common communication network. The maximum length of
the connecting two-wire twisted cable is 1,200 m. If repeaters are used, the number of meter stations and
cable length can further be increased. The cable wires are to be connected to terminals 6 and 7.
The flowmeter found at the end of the communication network shall be provided with jumper W1 with
a terminal resistor 120 R. Jumper W1 is located on the terminal board FNS5 between the terminal strip and
lightning arrestor
flowmeter 1 flowmeter 2 flowmeter 3 flowmeter 4
Connection of flowmeters to RS-485 communication line
ELIS PLZEŇ a. s., Luční 425/15, 301 00 Plzeň, Czech Republic, Phone: +420/377 517 711, Fax: +420/377 517 722 Es90420K/c