Frankonia LWL-RS422 Bedienungsanleitung
Manual
LWL-RS422
Digital optical transmitter
for RS422 signals
Table of contents
1 Box contents.......................................................................................................................4
2 Characteristics....................................................................................................................4
3 Field of application.............................................................................................................
4 Maintenance.......................................................................................................................
Trouble shooting.................................................................................................................7
6 Accessories / Options.........................................................................................................8
Appendix: Details and operation.......................................................................................A1
Date:
08/22/13
LWL-RS422
Page: 4 Manual
1 Box contents
Quantity Description
2 Transceiver LWL-RS422
1 Duplex multimode optical fiber 62, / 12 µm
2 Chargers (standard)
1 Manual (english)
2 External battery packs (optional)
The shipment includes charged batteries. However, due to the self-
discharging of NiMH-batteries they should be recharged again before use.
Read chap.4(Maintenance) before charging the devices!
2 Characteristics
The digital optical system LWL-RS422 can be used to optically transmit
RS422 signals. Because of the optical transmission, the system is very
robust against EMS (electromagnetic susceptibility). It can withstand high
electric and magnetic fields, like they appear in EMC-tests. The system also
is optimized for low noise emission.
Power is supplied by internal NiMH-batteries which make the system easy
to use. The LWL-RS422 is prepared for the use of external batteries (with
optional battery pack).
Read chap. 4 before
charging!
LWL-RS422 Date:
08/22/13
Manual Page
3 Field of application
•Transmission of RS422 signals up to 1Mbit/s during EMC-tests
•Transmission of RS422 signals over long distances without signal loss
(up to 1000m or more, depending on timing requirements)
•Handle ground potential problems
4 Maintenance
Recharge batteries after use with the enclosed charger. To prevent a lazy
battery effect, discharge the devices every times completely by using the
automatic switch off (Leave the system on, until it turns off automatically).
Afterwards, charge the devices as usual.
The devices have to be turned off before connecting to the charger. If this
is disregarded, the system might get damaged!
4.1 shows the pinning of the charge connector. Chargers have to be
connected to pin 2 (+) and pin 4 (GND). An external supply (6…8V, 0. A)
can be connected to pin 3 (+) and pin 4 (GND). Use only po er supplies
hich are certified by Frankonia.
Maximum charging
current is 1 A
Fig. 4.1: Pinning of charge- / buffer connector
Devices must be
turned off before
connecting to
charger, or else the
system might get
damaged!
Pinning of charge- /
buffer connector
Date:
08/22/13
LWL-RS422
Page: 6 Manual
The included chargers are not meant to power the transceivers during
operation. The transceiver outside the shielded room can be run with an
external power supply (optional). The internal transceiver can be run with
an external battery, if needed (optional). Do not use the external power
supply or charger to power the transceiver inside the shielded room while
EMI-tests are running. This might damage the transceiver!
Due to self-discharge issues with NiMH batteries, recharge batteries before
use, if the system has not been used for a longer time.
Do not use cleaning agents or solvents to clean the devices, only use a
slightly moistened, soft cloth.
Do not open the devices, as there are no parts inside which have to be
maintained. The opened housing can pose a fire hazard through short-
circuit currents! Please contact your distributor or the manufacturer if you
have any problems. Send in the complete system (both transceivers), if a
problem cannot be solved by turning the devices off and on again or by
checking the positions of the switches. Please contact us in any case before
sending in the devices.
Do not open the
devices!
Short cut / fire
hazard!
Do not use charger
or po er supply
during EMI-test!
LWL-RS422 Date:
08/22/13
Manual Page 7
5 Trouble shooting
The following trouble shooting list is provided to assist you while having
problems. It might let you use the system again without a long down time:
Error: Possible reasons: Solution:
No or erroneous
transmission
Receiver does not
receive an optical signal
Cables damaged or not
attached properly
Wrong optical fibers
(diameter)
Low battery
System turned off
Check optical fibers and
connections, change
fibers if necessary
Check connectors and
cables for damages
Use fiber with
62, /12 µm
Charge batteries
Turn on all devices
Transmission stops Low battery
No optical signal at
receiver
System turned off
Charge batteries
Check for light at optical
output. Replace optical
fiber
Turn on all devices
Device cannot be
turned on, cannot be
charged
Batteries damaged
Internal fuse is broke
Charger or cable
damaged
Batteries
over discharged
Send device to us
Send device to us
Check / replace charger
and charging cable
Charge batteries,
maybe use other
charger ( battery cells)
Common problems Defective optical or
electrical cables or
connectors
Check connectors, fibers
and cables. Test with
other ones.
Replace cables
Date:
08/22/13
LWL-RS422
Page: 8 Manual
6 Accessories / Options
Part Order number Comment
Optical fiber LWL-2-xm x = length in m, duplex
External batteries FPB-60 6V/4Ah
Connector cable for
FPB-60
AK-BP Length approx. 1 cm
Charger with
connector plugs CH-1- m Standard charger
Manual MA-LWL-RS422 english
LWL-RS422 Date:
08/22/13
Manual - Appendix Page A1
Appendix: Details and operation
The following chapter de cribe pecial detail of the LWL-RS422 for half
duplex tran mi ion of RS422 ignal with max. 1MB/ data rate
(depending on ignal condition ). The y tem con i t of two identical
tran ceiver , one to be connected to the DUT and one to be connected to
the RS422 controller. The optical tran ceiver are code tran parent.
a) Housing and connectors / switches
Fig. a.1 how the front ide of the tran ceiver with connector and
witche :
•power pu h button with control LED (Pwr On/Off)
•battery information LED (Info)
•charge plug (Charge)
•optical connector FSMA (Optical In .. Out) for duplex multimode
fiber (62,5/125µm)
Frankonia GmbH - Zeppelin tr. 1 - 73274 Notzingen - Tel: +(49) 7021-9566925
Fig. a.1 Front side of the devices with connectors and push buttons
Front ide with
connector and pu h
button
Charge
Pwr Info
On/Off
Optical
In Out
Date:
08/22/13
LWL-RS422
Page: A2 Manual - Appendix
Fig. a.2 how the rear ide of the tran ceiver with SUB-D connector. The
pinning of the connector i al o hown in the figure:
•Connector SUB-D 9 for the RS422 ignal . The Pinning i printed on
the tran ceiver and hown in Fig. a.2.
The hou ing of the SUB-D 9 connector i connected to the aluminum ca e,
which i connected to the circuit GND. Thi hould be taken into account
during the te t (po ible ground loop , hort circuit , para itic to GND-
plane!).
b) Mode of operation
The RS422 format i tran mitted with the following rule:
∆U≥+ 200mV = “High” => optical Out = ON
∆U≤ -200mV = “Low” => optical Out = OFF
The optical receiver generate the RS422 data from the received optical
ignal .
U e a Z=120Ohm two-wire line to connect DUT and LWL-RS422 and
connect both power ground of LWL-RS422 and DUT (in ide and out ide
ALC) to avoid erroneou data due to potential difference (See pinning of
SUB-D 9 in Fig. a.2 and example of how to connect LWL-RS422 and DUT in
Fig. b.1). For longer wire line , both end hould be terminated with 120Ω.
Frankonia GmbH - Zeppelin tr. 1 - 73274 Notzingen - Tel: +(49) 7021-9566925
Fig. a.2 Rear side of the devices with connectors and switches
Rear ide with
connector . Pinning
i printed on the
hou ing too.
The SUB D housing
has the same
potential as the
aluminum case!
NC
54321
9 8 7 6
5
Out+In+GNDNC
NC NC In- Out-
No internal Termination !
RS422 – I/O
opto
Tx Rx
Add external
termination to the
SUB D9 plugs. If
longer cables are
used, it should be
terminated on both
ends!
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