Laurel Electronics Ethernet Node Configuration for Series 2 Digital Panel Meters, Counters, Timers, Transmitters and Ethernet-to-Serial Device Servers - Manual (Page 3)

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2. APPLICABILITY
This Manual applies to Ethernet option boards for our 1/8 DIN size digital panel meters and
counters, to our DIN-rail Ethernet transmitters, and to our DIN-rail Ethernet-to-serial device
server. These modules serve as Ethernet Nodes and are as follows:
• Our LNET Ethernet option board plugs into a host 1/8 DIN digital panel meter or counter, and
provides an RJ45 connector for a 10/100BaseT Ethernet interface. Before using this board with
your meter, verify that the meter label states “Series 2”. The host meter can be ordered with a
choice of displays, signal conditioner boards, relay output boards, and analog output boards.
• Our LNET485 Ethernet-to-serial device server option board also plugs into a host meter. It
provides an RJ45 connector for a 10/100BaseT Ethernet interface, plus an RJ11 connector to
serve as a device server for up to 31 meters on an RS485 bus. RS485 wiring is via commercial
straight-through 6-wire data cables. The host meter can be ordered with a choice of displays,
signal conditioner boards, relay output boards, and analog output boards.
• Our LTE Series DIN-rail Ethernet transmitter provides an RJ45 connector for a 10/100BaseT
Ethernet interface instead of the screw terminals for RS232 / RS485 serial communications of
our LT Series transmitters. Our transmitters accept the same signal conditioner boards as our
1/8 DIN size meters and counters. An isolated 4-20 mA analog output and dual relays are
standard. The Ethernet circuitry is on the transmitter main board. Power over Ethernet (PoE)
operation is jumper selectable with the DC power option (10-48 Vdc).
• Our LTNET485 DIN-rail mounted Ethernet-to-serial device server provides an electrically
isolated 10/100BaseT Ethernet interface via an RJ45 Ethernet connector, plus an RJ11
connector and screw terminals to serve as a device server for up to 31 meters and transmitters
on an RS485 bus. The RJ11 connector and screw terminal are wired in parallel. This DIN-rail
mounted server is the preferred Ethernet gateway for a bank of transmitters with screw
terminal data connectors. Even though it looks like a transmitter, the LTNET485 does not
accept a signal conditioner board.
Ethernet Nodes and instruments attached via RS485 to our device server Nodes can be accessed
over a LAN or a WAN once the Nodes have been configured via our PC-resident Node Manager
Software (see Section 7) or the Web Server (see Section 8) which is built into all Nodes. Once
communications have been established, the instruments associated with the Nodes can be set up
using our Instrument Setup Software (see Section 9), for example to scale the input and define
setpoints for relay operation. Custom software can also be written by users as described at the
end of this manual.
Instruments from other manufacturers can be operated on an RS485 bus supported by our
Ethernet-to-serial device server if the host computer uses the Modbus TCP protocol and com-
mands are issued suitable for these instruments.