Laurel-electronics Ethernet Node Configuration for Series 2 Digital P Manual de usuario descargar pdf (Pagina 11)

4.2 LTNET485 Ethernet-to-RS485 Device Server

3 Power GND

AC neutral or -DC

AC high or +DC

5 ARX (RX-)

4 ATX (TX-)

3 GND

2 BRX (RX+)

1 BTX (TX+)

RJ11

RJ45

P4 Ethernet

P3 RS485

The LTNET485 Ethernet-to-serial device server features an RJ45 Ethernet connector for direct

connection to a computer, router, switch or hub via an Ethernet cable, plus an RJ11 RS485

connector which is wired in parallel to five screw terminals. These additional connections allow

the server to support a total of 31 meters and transmitters on an RS485 bus.

The RJ11 connector is designed for use with our meters having the dual 6-pin RJ11 RS485 com-

munication option. These jacks allow multiple meters to be daisy-chained using readily-available

6-wire straight-through data cables with no need for hand-wiring or an RS485 hub.

The five screw terminals are designed for use with our non-Ethernet transmitters, which provide

screw terminals for RS485 I/O as a standard feature. Using screw terminals on the server and

transmitter ends allows data transmission via five discrete wires, with no need for adapters.

Serial Signal Duplex Jumpers Termination Resistor*

Full None E6 a + c

RS485

Half E6 b + d ** E6 c

* Only install termination resistor(s) if the device server is at one end of an RS485 line longer

than 200 feet (60 m).

** Or externally jumper BTX to BRX and ATX to ARX (same effect as internal jumpers).

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Laurel-electronics Ethernet Node Configuration for Series 2 Digital P Manual de usuario Pagina 11