Westermo LD-63B DC, LD-63B AC Installation Manual

Linjedelare, optisk fiber

- RS-422/485

Line sharing device, fibre optic

- RS-422/485

Glasfaser Leitungsteiler

- RS-422/485

INSTALLATIONSANVISNING

INSTALLATION MANUAL

INSTALLATIONS ANLEITUNG

6072-2021

www.westermosales.com

LD-63B

AC

LD-63B

DC

©

Westermo Teleindustri A B • 20 0 0 • Rev. C

Galvanic
Isolation

Transient

Protection

Balanced

TransmissionCEApproved

10 6072-2021

Specifications LD-63B

Transmission Asynchronous, full/half duplex or simplex
Interface 1 EIA RS-422/RS-485/ CCITT V.11

5-position screw block

Interface 2 4 ST-connectors, see table of power budget
Data rate 500 kbit/s to 4Mbit/s Manchester code*
Indicators Power, TD, RD, TX1, TX2, RX1, RX2
Temperature range 41–122°F, ambient temperature
Humidity 0–95% RH without condensation
Dimension

2.2x3.9x5 in. (WxHxD)

Weight 0.6 kg
Mounting

On 1.4 in. DIN-rail

Power supply alternatives

* For higher data rate, please contact Westermo.

Description LD-63B

The LD-63B is a line splitter for use in multi-drop fiber optic networks. The LD-63B
allows conversion between RS-422/485 and fiber optic. LD-63B is specially developed for
Manchester coded protocols with transmission rates over 500 kbit/s. The LD-63B
consists of two F/O channels, each with its separate transmitter and receiver (TX1, TX2,
RX1 and RX2). On the front of the units there are seven LED’s indicating the datatrans­mission on the channels. The fiber optic interface is transparent which means that data
received on RX1 is retransmitted on TX2 and data received on RX2 on TX1.
The number of LD-63B in multidrop is limited. See table of ”Maximum number of units”
on page 15.

Model description

LD-63B LD-63B LD-63B LD-63B LD-63B
AC 115V AC DC 36–55V DC 110V DC

Power supply 230V AC 115V AC 24V DC 48V DC 110V DC/80V AC

+15/–10% +15/–10% +50/–50% +15/–25% +10/–10%
Frequency 48–62Hz 48–62Hz – – –/48–62Hz
Fuse, F2 100mA S 100mA S 1.6A S 1.6A S 1A T/1A T

.2x.8 in. .2x.8 in .2x.8 in

.2x.8 in –/–

Littelfuse Littelfuse Littelfuse Littelfuse Wickmann
Power consumption 5VA 5VA 3W 3W 3W/3VA
Overvoltage

protection 430V 220V – – 430V
Isolation 1 500V 1 500V 500V 500V 3 750V

RMS

Gross Automation [phone] · www.westermosales.com · [e-mail]

116072-2021

Power budget

The LD-63B is developed for Manchester coded protocols and this means that the power
budget will change with the number of preamble bits in the actual protocol. Preamble bits
are sent before the actual data and has the function of synchronise units in the network
(see figure below).

The LD-63B uses the preamble bits for stabilising before receiving data and this means that
the LD-63B will distort the preamble bits used with more than 10%. The diagrams shows the
available power budget at different number of available preamble bits and at different trans­mission speeds.

Observe that the diagrams state the
minimum guaranteed power budget.
Experience show however that the typical
value is about 4 dBm higher with 820 nm,
about 3,5 dBm higher with 1300 nm and about 6 dBm higher with singel mode.
Also observe that the calculated values applies between two LD-63B units. In larger networks
each fiber optical loop needs to be summated to get the number of used preamble bits.

Example:

Calculation of number of used
preamble bits.

Assume 820 nm units and 1 Mbit/s tranmission rate.
This means that fiberloop 1, which need 6 dB, will use maximum 1 preamble bit
(from diagram).
Fiberloop 2 needs 14 dB and will use maximum 10 preamble bits (from diagram).
This gives a total maximum of 11 preamble bits.

Idle line 3 preamble bits Start sending data

(Manchester coded)

LD-63B

Loop 1

6dB 14dB

Loop 2

LD-63B LD-63B

Connection:

Gross Automation [phone] · www.westermosales.com · [e-mail]