Westermo ODW-630-F1 User manual

www.westermo.com
ODW-630-F1
Fibre Optic Modem
Industrial Converter
Serial RS-485 to Fibre Optic Link
Point to Point applications

26651-22641

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6651-22641
General information
Legal information
The contents of this document are provided “as is”. Except as required by applicable law,
no warranties of any kind, either express or implied, including, but not limited to, the
implied warranties of merchantability and fitness for a particular purpose, are made in
relation to the accuracy and reliability or contents of this document. Westermo reserves
the right to revise this document or withdraw it at any time without prior notice.
Under no circumstances shall Westermo be responsible for any loss of data or income or
any special, incidental, and consequential or indirect damages howsoever caused.
More information about Westermo can be found at the following Internet address:
www.westermo.com

46651-22641
Safety
Before installation:
Read this manual completely and gather all information on the unit. Make sure
that you understand it fully. Check that your application does not exceed the safe
operating specifications for this unit.
This unit should only be installed by qualified personnel.
This unit should be built-in to an apparatus cabinet, or similar, where access is
restricted to service personnel only.
The power supply wiring must be sufficiently fused, and if necessary it must be
possible to disconnect manually from the power supply. Ensure compliance to
national installation regulations.
This unit uses convection cooling. To avoid obstructing the airflow around the unit,
follow the spacing recommendations (see Cooling section).
Before mounting, using or removing this unit:
Prevent access to hazardous voltages by disconnecting the unit from the power
supply.
Warning! Do not open a connected unit. Hazardous voltages may occur within
this unit when connected to a power supply.
Class 1 Laser Product
This unit is designed to meet the Class 1 Laser regulations. However, the user is
warned not to look directly into fibre optical port or any connected fibre.
Care recommendations
Follow the care recommendations below to maintain full operation of the unit and to
fulfil the warranty obligations.
This unit must not be operated with covers or lids removed.
Do not attempt to disassemble the unit. There are no user serviceable parts inside.
Do not drop, knock or shake the unit. Rough handling beyond the specification may cause
damage to internal circuit boards.
Do not use harsh chemicals, cleaning solvents or strong detergents to clean the unit.
Do not paint the unit. Paint can clog the unit and prevent proper operation.
Do not expose the unit to any kind of liquids (rain, beverages, etc).
The unit is not waterproof. Keep the unit within the specified humidity levels.
Do not use or store the unit in dusty, dirty areas. Connectors as well as other
mechanical parts may be damaged.
If the unit is not working properly, contact the place of purchase, nearest Westermo
distributor office, or Westermo Tech support.
Fibre connectors are supplied with plugs to avoid contamination inside the optical port.
The plug should be fitted when no optical fibre is inserted in the connector, e.g. during
storage, service or transportation.
!
!
!

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6651-22641
Note. Fibre Optic Handling
Fibre optic equipment requires careful handling as the fibre components are very
sensitive to dust and dirt. If the fibre is disconnected from the modem, the protective
plug on the transmitter/receiver must be replaced. The protective plug must be kept on
during transportation. The fibre optic cable must also be protected in the same way.
If this recommendation is not followed, it can jeopardise the warranty.
Cleaning of the optical connectors
In the event of contamination, the optical connectors should be cleaned by using forced
nitrogen and some kind of cleaning stick.
Recommended cleaning fluids:
• Methyl-, ethyl-, isopropyl- or isobutyl-alcohol
• Hexane
• Naphtha
Maintenance
No maintenance is required, as long as the unit is used as intended within the specified
conditions.
Product disposal
This symbol means that the product shall not be treated as
unsorted municipal waste when disposing of it. It needs to
be handed over to an applicable collection point for recy-
cling electrical and electronic equipment.
By ensuring this product is disposed of correctly, you will
help to reduce hazardous substances and prevent potential
negative consequences to both environment and human
health, which could be caused by inappropriate disposal.

66651-22641
FCC Part 15.105
Notice:
This equipment has been tested and found to comply with the limits for a Class A
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a
commercial environment.
This equipment generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instruction manual, may cause harmful interfer-
ence to radio communications. Operation of this equipment in a residential area is likely
to cause harmful interference in which case the user will be required to correct the
interference at his own expense.
Type Approval / Compliance
EMC EN 61000-6-1, Immunity residential environments
EN 61000-6-2, Immunity industrial environments
EN 61000-6-3, Emission residential environments
EN 61000-6-4, Emission industrial environments
EN 55022, Emission IT equipment, class A
EN 55024, Immunity IT equipment
FCC part 15 Class A
EN 50121-4, Railway signalling and telecommunications apparatus
IEC 62236-4, Railway signalling and telecommunications apparatus
Safety EN 60950-1, IT equipment
Agency approvals and standards compliance
Simplified EU declaration of conformity
Hereby, Westermo declares that the equipment is in compliance with EU directives. The
full EU declaration of conformity and other detailed information are available at the
respective product page at www.westermo.com.

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Electromagnetic Compatibility
Phenomena Test Description Level
ESD EN 61000-4-2 Enclosure contact ± 6 kV
Enclosure air ± 8 kV
RF field AM modulated IEC 61000-4-3 Enclosure 10 V/m 80% AM (1 kHz), 80 – 800 MHz
20 V/m 80% AM (1 kHz), 800 – 1000 MHz
20 V/m 80% AM (1 kHz), 1400 – 2700 MHz
RF field 900 MHz ENV 50204 Enclosure 20 V/m pulse modulated 200 Hz, 900 ± 5 MHz
Fast transient EN 61000-4-4 Signal ports ± 2 kV
Power ports ± 2 kV
Surge EN 61000-4-5 Signal ports unbalanced ± 2 kV line to earth, ± 2 kV line to line
Signal ports balanced ± 2 kV line to earth, ± 1 kV line to line
Power ports ± 2 kV line to earth, ± 2 kV line to line
RF conducted EN 61000-4-6 Signal ports 10 V 80% AM (1 kHz), 0.15 – 80 MHz
Power ports 10 V 80% AM (1 kHz), 0.15 – 80 MHz
Pulse Magnetic field EN 61000-4-9 Enclosure 300 A/m, 6.4 / 16 µs pulse
Voltage dips
and interruption
EN 61000-4-11 AC power ports 10 & 5 000 ms, interruption
200 ms, 40% residual voltage
500 ms, 70% residual voltage
Mains freq. 50 Hz EN 61000-4-16 Signal ports 100 V 50 Hz line to earth
Mains freq. 50 Hz SS 436 15 03 Signal ports 250 V 50 Hz line to line
Radiated emission EN 55022 Enclosure Class B
FCC part 15 Class A
Conducted emission EN 55022 AC power ports Class B
FCC part 15 AC power ports Class B
EN 55022 DC power ports Class A
Dielectric strength EN 60950 Signal port to all other
isolated ports
2 kVrms 50 Hz 1min
Power port to other
isolated ports
3 kVrms 50 Hz 1min
2 kVrms 50 Hz 1min (@ rated power < 60V)
Environmental
Temperature Operating –40 to +70°C
Storage & Transport –40 to +70°C
Maximum surface
temperature
135ºC (temperature class T4)
Humidity Operating 5 to 95% relative humidity
Storage & Transport 5 to 95% relative humidity
Altitude Operating 2 000 m / 70 kPa
Service life Operating 10 year
Vibration IEC 60068-2-6 Operating 7.5 mm, 5 – 8 Hz
2 g, 8 – 500 Hz
Shock IEC 60068-2-27 Operating 15 g, 11 ms
Packaging
Enclosure UL 94 PC / ABS Flammability class V-1
Dimension W x H x D 35 x 121 x 119 mm
Weight 0.26 kg
Degree of protection IP 21
Cooling IEC 529 Enclosure Convection
Mounting Horizontal on 35 mm DIN-rail
Type tests and environmental conditions

86651-22641
STATUS
C
NO
NC
LED’s
Switches
CH 1
SFP
Fibre transceiver
TX
RX
I
nternal
E
lectronics
ODW-630-F1
COM
COM
+VA
O
V
P
+VB
POWER
T
/R
-
T/R+
RS -485
R
-
R+
+5V
0V
+5V
0V
O
C
P
O
V
P
Functional description
OVP Over Voltage Protection
OCP Over Current Protection
Converter serial interface – optical fibre
ODW-630-F1 is a fibre optic modem that converts between electrical RS-485 and a fibre
optic link.
ODW-630-F1 can also be used to convert from RS-232 to RS-485 by using one
ODW-620-F1 and one ODW-630-F1.
Data rate up to 1.5 Mbit/s
ODW-630-F1 converts data using rates from 300 bit/s up to 1.5 Mbit/s.

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Point-to-point communication via fibre optical network
The serial data is transferred via a fibre optic network between two ODW-630-F1s.
This application is useful e.g. for long distance communication, where electromagnetic
interference may occur or when isolation of the electrical network is needed. The maxi-
mum optical fibre distance between two units depends on selected fibre transceiver and
fibre type.
Note! The bi-di transceivers must always be used in pair, see example:
TX 1310 nm RX 1310 nm
RX 1550 nm TX 1550 nm
POWER CH 1
COM +VA +VB COM
POWER CH 1
COM +VA +VB COMTX RX TX RX
Fibre optical connection
at point-to-point communication
POWER CH 1
COM +VA +VB COM
POWER CH 1
COM +VA +VB COM
TX/
RX
TX/
RX
Fibre optical connection
at point-to-point communication (Bi-di transceiver)
Bi-di transceiver, TX 1310 nm,
RX 1550 nm.
Bi-di transceiver, TX 1550 nm,
RX 1310 nm.
Serial data transfer can be set in two modes:
…Syncronous mode: Transfer special protocols such as Manchester coded protocol.
See special switch settings on page 17.
…Asyncronous mode: Data will be sent over the fibre optic network when a start-bit has
been identified. The data rate and number of data bits should be set by DIP-switches.
The turning time (from sending serial RS-485 data until changing to receive mode) is
automatically calculated from the DIP-switch setting.

10 6651-22641
Optical fibre link functionality and status indication
At power on, all LED’s will be active during an initiation sequence followed by an auto-
matic initiation of the optical fibre link. The alarm will be set until the fibre optic link is in
operation and ready to transfer serial data. Data can be transferred over the fibre optic
link as long as the link is in operation.
When the fibre optic link is out of operation this will be indicated by a local alarm out-
put. When the link returns to operation, the alarm will reset automatically.
RS-485 interface
A 4 position detachable screw terminal that can handle full duplex data rates up to
1.5 Mbit/s and can be set to either 2- or 4-wire RS-485 system.
When 4-wire RS-485 is selected, the terminals T/R+ and T/R– will always be set to
transmit and terminals R+ and R– will always receive data.
Manchester coded protocol can be transferred with synchronous mode.
Redundant power supply, galvanic isolated (2 kVAC) to other ports
The ODW-630-F1 should be supplied with safety extra low voltage (SELV). It is designed
to operate permanently over a wide DC or AC voltage input range and provided with
two independent inputs for enhanced redundancy if either supply fails.
Single- or multimode LC fibre connectors
The ODW-630-F1 uses Small Form Factor Pluggable (SFP) transceivers that are in
compliance with Multi-Sourcing Agreement (MSA). A wide range of different fibre
transceivers and connectors can be used.
Status interface
This port enables supervision of fibre optic link status by a relay with both normally
open and closed contacts.
The status will be set if:
• Local or remote of fibre link errors exist.
• The unit is out of service, e.g. no power supply.
Designed for harsh environments, such as industrial, road and railway
applications
The ODW-630-F1 complies with standards for industrial environments, railway signalling
and telecommunications apparatus. Additionally the wide temperature range permits it to
be installed in out-door cabinets without any additional measures, such as heating, etc.

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6651-22641
System delay in an optical network
Serial data transferred from one ODW-630-F1 via an optical network to a second one,
will be delayed due to the length of optical fibre and the signal processing within the
units. The signal processing delay is dependent on the data rate and conversions, and the
fibre delay is dependent on the total length of the optical fibre.
Item Functions Delay
1 Fibre:
Optical fibre length delay (typical)
5 ms/km
2 Converter electrical to fibre:
Signal processing
0.6 ms (synchronous mode)
1 tBit + 0.6 ms
(asynchronous mode)
3 Converter fibre to electrical:
Signal processing
0.6 ms
Note t
bit = 1 / Baud rate (Baud rate in bit/s)
The system delay when transferring data from the serial input at one ODW-630-F1 to
the serial output of other one is calculated by adding the following:
1. Fibre: The optical fibre length delay.
2. Converter electrical to fibre: Signal processing delay.
3. Converter fibre to electrical: Signal processing delay.
Example 1: Synchronous data data transfer from one ODW-630-F1 to a second
converter with a total fibre length of 25 km. Data rate of 9 600 bit/s.
1. Fibre: The total optical fibre length delay 25 * 5 ms = 125 ms.
2. Converter electrical to fibre: Signal processing delay 1 tbit + 0.6 ms = 105 ms + 1.0 ms
= 106 ms.
3. Converter fibre to electrical: Signal processing delay = 0.6 ms.
4. The system delay is calculated by adding the delays in items 1 to 3 above = 232 ms
Example 2: Synchronous data transfer from one ODW-630-F1 to a second converter
with a total fibre length of 25 km. Data rate of 9 600 bit/s.
5. Fibre: The total optical fibre length delay 25 * 5 ms = 125 ms.
6. Converter electrical to fibre: Signal processing delay = 0.6 ms.
7. Converter fibre to electrical: Signal processing delay = 0.6 ms.
8. The system delay is calculated by adding the delays in item 1 to 3 above = 126 ms

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Status
Port type Signal relay, changeover contacts
Rated voltage Up to 48 VDC
Operating voltage Up to 60 VDC
Contact rating 500 mA @ 48 VDC
Contact resistance < 50 mW
Isolation to Serial port and Power port
Connection Detachable screw terminal
Connector size 0.2 – 2.5 mm² (AWG 24 – 12)
Shielded cable Not required
* External supply current capability for proper startup
RS-422/485
Electrical specification EIA RS-485, 2-wire or 4-wire twisted pair
Data rate 300 bit/s – 1.5 Mbit/s
Data format 9 – 12 bits
Protocol Start-bit followed by 8-11 bits
Retiming Ye s
Turning time
(2-wire RS-485)
One tbit
tbit = 1 / Baud rate (Baud rate in bit/s)
Transmission range < 1200 m, depending on data rate and cable type (EIA RS-485)
Settings 120 W termination and failsafe biasing 680 W
Protection Installation Fault Tolerant (up to ±60 V)
Isolation to Status and Power port
Connection Detachable screw terminal
Connector size 0.2 – 2.5 mm² (AWG 24 – 12)
Shielded cable Not required
Interface specifications
Power
Rated voltage 12 to 48 VDC
24 VAC
Operating voltage 10 to 60 VDC
20 to 30 VAC
Rated current 300 mA @ 12 V
150 mA @ 24 V
75 mA @ 48 V
Rated frequency DC: –
AC: 48 to 62 Hz
Inrush current I²t 0.2 A²s
Startup current* 1.0 Apeak
Polarity Reverse polarity protected
Redundant power input Ye s
Isolation to RS-422/485 and Status port
Connection Detachable screw terminal
Connector size 0.2 – 2.5 mm² (AWG 24 – 12)
Shielded cable Not required

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FX (Fibre) SM-LC80 SM-LC40 SM-LC15 MM-LC2
Fibre connector LC duplex LC duplex LC duplex LC duplex
Fibre type Singlemode
9/125 mm
Singlemode
9/125 mm
Singlemode
9/125 mm
Multimode,
62.5/125 and
50/125 mm
Wavelength nm 1550 1310 1310 1310
Transmitter
Output optical power min/max
–5/0 dBm** –5/0 dBm** –15/–8 dBm** –20/–14 dBm*
Receiver
Input sensitivity, max
–34 dBm –34 dBm –31 dBm –31 dBm
Receiver
Input optical power, max
–5 dBm*** –3 dBm*** –8 dBm –8 dBm
Optical power budget,
worst-case
29 dB 29 dB 16 dB 11 dB
Transceiver type Small Form Factor Pluggable (SFP)
Multi-Sourcing Agreement (MSA) compliant
Laser class Class 1, IEC 825-1 Accessible Emission Limit (AEL)
Optical Power Budget
The allowed link length is calculated from the optical power budget (OPB), the available optical
power for a fibre-optic link, and the attenuation of the fibre, comprising losses due to in-line
connectors, splices, optical switches and a margin for link ageing (typical 1.5 dB for 1300 nm).
The worst-case optical power budget (OPB) in dB for a fibre-optic link is determined by the differ-
ence between the transmitter’s output optical power (min) and the receiver input sensitivity (max).
FX (Fibre) Bi-di
LC-60
Bi-di
LC-40
Bi-di
LC-20
Bi-di
MM LC-2
Fibre connector LC Simplex LC Simplex LC Simplex LC Simplex
Fibre type Singlemode
9/125 µm
Singlemode
9/125 µm
Singlemode
9/125 µm
Multimode
62.5/125 and
50/125 µm
Wavelength nm, connector 1
Wavelength nm, connector 2
Tx 1310, rx
1550 Tx 1550,
rx 1310
Tx 1310, rx
1550 Tx 1550,
rx 1310
Tx1310, rx
1550 TX
1550, rx 1310
Tx 1310, rx
1550 Tx 1550,
rx 1310
Transmitter
Output optical power min/max
–5/0 dBm ** –8/0 dBm ** -10/0 dBm ** –10/–8 dBm *
Receiver
Input sensitivity, max
–34 dBm –34 dBm –28 dBm –28 dBm
Receiver
Input optical power, max
0 dBm*** 0 dBm*** 0 dBm –0 dBm
Optical power budget,
worst-case
29 dB 26 dB 18 dB 18 dB
Transceiver type Small Form Factor Pluggable (SFP)
Multi-Sourcing Agreement (MSA) compliant
Laser class Class 1, IEC 825-1 Accessible Emission Limit (AEL)
* Output power is power coupled into a 62.5/125 mm multimode fibre
** Output power is power coupled into a 9/125 mm singlemode fibre
*** The optical power should be reduced by at least 5 dB (SM-LC80 and Bi-di LC-60) or 3dB (SM-LC-40
and Bi-di LC-40) between the optical output and input.

14 6651-22641
Location of Interface ports, LED’s and DIP-switches
Position Direction* Description Product
marking
1 In Common
voltage
COM
2 In Voltage A +VA
3 In Voltage B +VB
4 In Common
voltage
COM
Position Direction Description Product
marking
1 NO Contact with C
when fibre opti-
cal links are in
operation
NO
2 C Common C
3 NC Open (no con-
tact with C)
when fibre opti-
cal links are in
operation
NC
Position Direction* Description Product marking
1 In R+ (EIA RS-485 A’) R+
2 In R– (EIA RS-485 B’) R–
3 In/Out T+ (EIA RS-485 A) T/R+
4 In/Out T– (EIA RS-485 B) T/R–
LED Indicators
(for details
see page 5)
DIP-switches accessible under lid
(for details see page 16-18)
FX(Fibre)
(for details
see page 13)
Status
screw terminal
Power
screw terminal
RS-422/485
screw terminal
* Direction relative this unit

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6651-22641
Position Direction* Description Product marking
1 In R+ (EIA RS-485 A’) R+
2 In R– (EIA RS-485 B’) R–
3 In/Out T+ (EIA RS-485 A) T/R+
4 In/Out T– (EIA RS-485 B) T/R–
LED indicators
LED Status Description
PWR
Power
ON In service (power)
Flashing Fault condition
OFF Out of service
RDR OFF Not used
CH 2 OFF Not used
CH 1 ON Fibre link at port CH 1 in operation.
Data can be transmitted
OFF Fibre link at port CH 1 out of operation
TD
Serial data Receive
Flashing Receive accepted data on the serial port.
Data will be transmitted to the fibre link
OFF –
RD
Fibre link data Receive
Flashing Receive data on the fibre link. This frame
is transmitted to the serial port
OFF –
FL R (Red)
Failure Link Remote
ON Remote fibre link failure. A fibre link is
out of operation at any other unit of the
optical network
OFF All fibre links are in operation at all
other units in the fibre optical network
FL L (Red)
Failure Link Local
ON Local fibre link failure. This unit has
identified a fibre link failure
OFF Fibre link of this unit is in operation

16 6651-22641
Configuration
All needed configurations and parameter settings are done by the DIP-switches, located
under the top lid.
!
DIP-switch settings
Before DIP-switch settings:
Prevent damage to internal electronics from electrostatic discharges (ESD)
by discharging your body to a grounding point (e.g. use of wrist strap)
Note: Disconnect power before DIP-switch settings.
S2S1
S1 DIP-switch, asynchronous mode
ON
1 2 3 4 5 6 7 8
RS-485 2-wire
ON
1 2 3 4 5 6 7 8
RS-485 4-wire
ON
1 2 3 4 5 6 7 8
300 bit/s
ON
1 2 3 4 5 6 7 8
1 200 bit/s
ON
1 2 3 4 5 6 7 8
2 400 bit/s
ON
1 2 3 4 5 6 7 8
4 800 bit/s
ON
1 2 3 4 5 6 7 8
9 600 bit/s
ON
1 2 3 4 5 6 7 8
19.2 kbit/s
ON
1 2 3 4 5 6 7 8
38.4 kbit/s
ON
1 2 3 4 5 6 7 8
57.6 kbit/s
ON
1 2 3 4 5 6 7 8
115.2 kbit/s
ON
1 2 3 4 5 6 7 8
125 kbit/s
S3
ON
1 2 3 4 5 6 7 8
187.5 kbit/s
ON
1 2 3 4 5 6 7 8
230.4 kbit/s
ON
1 2 3 4 5 6 7 8
250 kbit/s
ON
1 2 3 4 5 6 7 8
500 kbit/s
ON
1 2 3 4 5 6 7 8
1.0 Mbit/s
ON
1 2 3 4 5 6 7 8
1.5 Mbit/s

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6651-22641
Factory settings
ON
1 2 3 4 5 6 7 8
S1
ON
1 2 3 4 5 6 7 8
S2
S1 DIP-switch
ON
1 2 3 4 5 6 7 8
9 bits data format
ON
1 2 3 4 5 6 7 8
10 bits data format
ON
1 2 3 4 5 6 7 8
11 bits data format
ON
1 2 3 4 5 6 7 8
12 bits data format
S2 DIP-switch
ON
1 2 3 4 5 6 7 8
Protocol Asynchronous mode,
with start-bit control
ON
1 2 3 4 5 6 7 8
Set status port at local fibre link
error*
S3 DIP-switch
No termination and fail-safe
Termination with fail-safe (4-wire)
Termination with fail-safe (2-wire)
ON
1 2 3 4
ON
1 2 3 4
ON
1 2 3 4
S3
ON
1 2 3 4
ON
1 2 3 4 5 6 7 8
Synchronous mode
(see table on next page)
Supervision table when selecting data format
Start bit … … … … … … … …
7 bit … … … …
8 bit … … … …
Parity … … … …
1 stop bit … … … …
2 stop bit … … … …
Number of bit 9 10 10 10 11 11 11 12
* SW 2:6 ON: The status relay only change status in the unit that is connected to the receive side.

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SW:1 SW:2 Transmitter
ON
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
1.6 ms
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
416 µs
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
208 µs
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
104 µs
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
52 µs
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
26 µs
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
13 µs
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
8.6 µs
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
4.3 µs
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
4 µs
Synchronous mode ODW-630-F1
RS-485 transmitter on-time after last data transition
SW:1 SW:2 Transmitter
ON
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
2.6 µs
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
2.1 µs
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
2 µs
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
1 µs
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
500 ns
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
300 ns
Example:
The data speed in a particular application is
250 kbit/s.
Calculate the maximum data transition time:
1/250 x 103 = 4 x 10-6 = 4 µs.
Using dip-switches 1:3 – 1:6, set the transmitter
on time to the closest higher value, e.i. 4.3 µs.
Note: Selecting a transmitter on time that is
shorter than the data transition time will result
in corrupted data.

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6651-22641
RS-485 termination at system level
The system should be installed in according to the RS-485 specification. A system should
always form a bus structure where the termination is at the end points of the bus.
See diagrams for details of how this is done with RS-485 2-wire and 4-wire.
=Termination
ODW-630-F1
Slave unit Slave unit Slave unit
ODW-630-F1
Slave unit Slave unit Slave unit
Max 0.3 metre
=Termination
T/R+
T/R–
T/R+T/R– T/R+T/R– T/R+T/R–
R+
R–
T+
T–
R– R+ R+T– T– R– R+ T– T+T+T+ R–

20 6651-22641
Cooling
This unit uses convection cooling. To avoid obstructing the air-
flow around the unit, use the following spacing rules. Minimum
spacing 25 mm (1.0 inch) above /below and 10 mm (0.4 inches)
left /right the unit. Spacing is recommended for the use of unit
in full operating temperature range and service life.
Removal
Press down the black support at the top of the unit. See figure.
Mounting
This unit should be mounted on 35 mm DIN-rail, which is
horizontally mounted inside an apparatus cabinet, or similar.
Snap on mounting, see figure.
CLICK!
CLICK!
10 mm *
(0.4 inches)
25 mm
25 mm
* Spacing (left/right) recommended for
full operating temperature range