Laurel-electronics Ethernet Node Configuration for Series 2 Digital P Bedienungsanleitung PDF herunterladen (Seite 12)

4.3 LT Series DIN-Rail Transmitters on an RS485 Bus

P4 Analog

output (standard)

P3 Solid state

relays (normally

open, standard)

P5 Signal

input &

excitation

output

Ana out - 1

Ana out + 2

Alarm 2 1

Alarm 2 2

Aalrm 1 3

Alarm 1 4

Signal

conditioner

board

RS485

6 N/C

5 ARX

4 ATX

3 GND

2 BRX

1 BTX

3 Power GND

2 AC neut or -DC

1 AC high or +DC

RS232

GND

P1 Power input

Communications

Reset

LT Series transmitters on an RS485 bus offer RS485 data I/O as a standard feature along with an

isolated 4-20 mA, 0-20 mA or 0-10V analog output and dual 120 mA solid state relays for alarm or

control. Signal conditioner boards are available for all popular industrial analog, frequency and

pulse-type transducer signals.

For Ethernet connectivity, connect up to 31 LT Series transmitters to our LTNET485 DIN-rail

Ethernet-to-serial device server using discrete, parallel wires in daisy chain fashion from the

server to each transmitter.

• For full-duplex communications, use five wires to connect BTX to BTX, BRX to BRX, ATX to

ATX, ARX to ARX, and GND to GND, all in daisy chain fashion without crossover.

• For half-duplex communications, use three wires to connect A to A, B to B, and GND to GND.

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 transmitter is the last device on an RS485 line longer

than 200 feet (60 m).

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

To reset the transmitter (same as power-up), press the Reset button.

To reset communications to 9600 baud, command mode, Custom ASCII protocol, and Address 1,

place a jumper at E1 and power up the transmitter, then remove the E1 jumper.

Other jumper positions are as for our LTE Ethernet Transmitter Node (Section 4.1).

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