HFBR-0528 Avago Technologies US Inc., HFBR-0528 Datasheet - Page 12

• Manufacturer Part Number: HFBR-0528
• Description: KIT EVAL FIBER OPTIC 10MBD
• Manufacturer: Avago Technologies US Inc.

Specifications of HFBR-0528

• Main Purpose: Interface, Fiber Optics
• Embedded: No
• Utilized Ic / Part: HFBR-1528, HFBR-2528
• Primary Attributes: 10MBd, Communication up to 50m using 1mm POF
• Secondary Attributes: Crimpless Connectors
• Silicon Core Number: HFBR-1528, HFBR-2528
• Kit Contents: TX/RX Mods, Cable, Pol Kit, SW, Pwr. Sup
• Silicon Family Name: Versatile Link
• Features: Fiber Optic Transmitter And Receiver
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 516-2144; HFBR-0528

V. Application Examples
1. Introduction to Industrial Communication Networks
Compared to 0 years ago, today’s industrial control
equipment has changed dramatically. No longer are
many single twisted-paired lines from sensors and actu-
ators bundled into one huge and heavy cable and con-
nected to a programmable logic controller. Today, the
intelligence is distributed in the network; the actuators
and sensors are connected via a bus, star or ring topology
to a master unit. Standards committees and user groups
have defined serial data rates from several kBd to more
than 2 MBd for twisted pair and fiber-optic media inter-
faces. But these open-system standards do not always
meet the application requirements because of speed,
noise immunity, and distance specifications. Proprietary
networks for critical, real-time applications, for example,
must have faster response times than today’s standards
are specified for. These applications need serial noiseless
communication channels with data rates as high as 0
MBd to achieve the desired performance of the control
system. At these conditions, it is worth considering the
de-facto industry standard HFBR-0508Z, fiber-optic link
for isolated and reliable optical interconnects.
Figure 19. Network Overview with RS 485 TP Bus and Fiber Optic Active Star
2
DTE
DATA
TERMINAL
EQUIPMENT
OPTIC
LINKS
FIBER
DTE
DTE
DTE
DTE
DTE
*
*
R
REPEATER
DTE
DTE
R
*
ACTIVE STAR
DTE
DTE
DTE
1.1. Interface to RS 422 and RS 485
Many networks are based on an RS-485/422 physical
media interface, which are based on a bus topology.
Different ground potentials and noise sources may not
allow a non-isolated bus structure. Therefore, active star
couplers with fiber-optic ports are preferred. Quite often,
a mixed topology consisting of fiber cable and twisted-
pair wire is desired. In this case, the Versatile Link family
is the most cost-effective line of products for fiber-optic
inter-repeater links. The Versatile Link’s small package al-
lows Avago Technologies' parts to be assembled into an
adapter housing for an electrical-optical converter. One
side of the housing holds the electrical subminiture con-
nector to interface with the twisted-pair bus, the oppo-
site side has the duplex, snap-in, fiber-optic connection.
Standard “off-the-shelf ” line drivers and receivers for RS-
422 and RS-485
bus and the TTL receiver output and transmitter input.
While the majority of industrial communication appli-
cations are specified for data rates of 2 MBd and below
(much lower than the speed of the HFBR-0508Z link), the
large dynamic range of the HFBR-2528Z receiver allows
a fiber-optic link to be designed without transmitter op-
tical output power adjustment. This factor makes the in-
stallation instruction much simpler and avoids trouble-
shooting exercises due to receiver overdrive conditions.
Whether the link is anywhere from zero meters up to the
maximum length specified in the data sheet or whether
the fiber is HCS or POF, the link will work reliably the mo-
ment that the power is turned on.
DTE
TWISTED
BUS
TERMINAL
PAIR
R
R
OPTIC
FIBER
LINK
[5,6,20]
interface between the twisted-pair