westermo MDW-45 Serial Converter User Guide
- June 9, 2024
- westermo
Table of Contents
MDW-45
Converter
RS-232 – RS-422/485
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
www.westermo.com
Safety and Regulations
Warning signs are provided to prevent personal injury and/or damages to the
product.
The following levels are used:
Level of warning| Description| Consequence personal injury|
Consequence material damage
---|---|---|---
WARNING| Indicates a potentially hazardous situation| Possible death or major
injury| Major damage to the product
CAUTION
| Indicates a potentially hazardous situation| Minor or moderate injury|
Moderate damage to the product
NOTICE
| Provides information in order to avoid misuse of the product, confusion or
misunderstanding| No personal injury| Minor damage to the product
NOTE
| Used for highlighting general, but important information| No personal
injury| Minor damage to the product
Before installation:
Read this manual completely and gather all information on the product. Make
sure that you understand it fully. Check that your application does not exceed
the safe operating
specifications for this product.
WARNING – SAFETY DURING INSTALLATION
The product must be installed by qualified service personnel and built in to
an apparatus cabinet or similar, where access isrestricted to service
personnel only.
WARNING – HAZARDOUS VOLTAGE
Do not open an energized product. Hazardous voltage may occur when connected
to a power supply.
WARNING – PROTECTIVE FUSE
The power supply wiring must be sufficiently fused.
It must be possible to disconnect manually from the power supply.
Ensure compliance to national installation regulations.
CAUTION – ELECTROSTATIC DISCHARGE (ESD)
Prevent electrostatic discharge damages to internal electronic parts by
discharging your body to a grounding point (e.g. use a wrist strap).
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 recycling 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.
Care recommendations
Follow the care recommendations below to maintain full operation of product and to fulfill the warranty obligations:
- Do not drop, knock or shake the product. Rough handling above the specification may cause damage to internal circuit boards.
- Use a dry or slightly water-damp cloth to clean the product. Do not use harsh chemicals, cleaning solvents or strong detergents.
- Do not paint the product. Paint can clog the product and prevent proper operation.
If the product is used in a manner not according to specification, the
protection provided by the equipment may be impaired.
If the product is not working properly, contact the place of purchase, nearest
Westermo distributor office or Westermo technical support.
Declaration of Conformity
Hereby, Westermo declares that this product is in compliance with applicable
EU directives and UK legislations. The full declaration of conformity and
other detailed information is available at www.westermo.com/support/product-
support.
Agency approvals and standards compliance
| Type | Approval / Compliance |
|---|---|
| EMC | EN 61000-6-2 |
| EN 61000-6-4 | Emission industrial environments |
FCC Part 15.105 Notice:
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
Type tests and environmental conditions
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 – 1
000 MHz
20 V/m 80% AM (1 kHz), 800 – 960 MHz
20 V/m 80% AM (1 kHz), 1 400 – 2 700 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
Magnetic field, power freq.| EN 61000-4-8| Enclosure| 100 A/m, 50 Hz, 16.7 Hz
& 0 Hz
Pulse Magnetic field| EN 61000-4-9| Enclosure| 300 A/m, 6.4 / 16 ms pulse
Mains freq. 50 Hz| EN 61000-4-16| Signal ports| 100 V 50 Hz
Mains freq. 50 Hz| SS 436 15 03| Signal ports| 250 V 50 Hz
Radiated emission| CISPR 22| Enclosure| Class B
FCC part 15| | Class B
Conducted emission| CISPR 22| AC power ports| Class B
FCC part 15| AC power ports| Class B
CISPR 22| DC power ports| Class B
Dielectric strength| | Signal port to all other| 2 kVrms 50 Hz 1min
Power port to all other| 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
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, MDW-45| UL 94| PC / ABS| Flammability class V-1
Dimension W x H x D| | | 35 x 121 x 119 mm
Weight| | | 0.19 kg
Degree of protection| IEC 529| Enclosure| IP 21
Cooling| | | Convection
Mounting| | | Horizontal on 35 mm DIN-rail
Functional description
The MDW-45 is an RS-422/485 to RS-232 converter. This device can be used in multidrop and point to point applications to connect devices like PCs, PLCs, drives and other automation equipment. In 2-wire half duplex applications (RS-485) the MDW-45 can automatically control the state of the data bus based just on the data it receives. This allows the unit to be used with equipment that has no handshaking signal. The maximum transmission rate possible is 115.2 kbit/s.
Interface specifications
Power
| MDW-45 LV| MDW-45 HV
Rated voltage| 12 to 48 VDC| 95 to 240 VAC
110 to 250 VDC
Operating voltage| 9.6 to 57.6 VDC| 85.5 to 264 VAC 88 to 300 VDC
Rated current| 95 mA @ 12 VDC
35 mA @ 48 VDC
| 21 mA @ 95 VAC
10 mA @ 110 VDC
Rated frequency| DC| 48 – 62 Hz / DC
Polarity| Reverse polarity protected| Polarity independent
Connection| Detachable screw terminal| Detachable screw terminal
Connector size| 0.2 – 2.5 mm² (AWG 24-12)| 0.2 – 2.5 mm² (AWG 24-12)
RS-422/485
Electrical specification| RS-485
Data rate| 1 200 bit/s – 115.2 kbit/s
Data format| 7 or 8 data bit, Odd, even or none parity, 1 or 2 stop bit
Connection| Detachable screw terminal
Connector size| 0.2 – 2.5 mm² (AWG 24-12)
Transmission range| In accordance with EIA RS-485
≤ 1200 m, depending on data rate and cable type
Settings| 120 Ω termination and failsafe biasing 680 Ω , by DIP-switch
Protection| Installation Fault Tolerant (up to ±60 V)
RS-232
Electrical specification| RS-232
Data rate| 1 200 bit/s – 115.2 kbit/s
Data format| 7 or 8 data bit, Odd, even or none parity, 1 or 2 stop bit
Connection| 9-pin D-sub female DCE
Transmission range| 15 m
Locations of Interface ports, LED`s and DIP-switches
Railway installation close to the rails (RS-232, RS-422/485)
For a cable located inside 3 m boundary and connected to this port, the use of shielded cable is recommended, this to minimize the risk of interference. The cable shield should be properly connected (360°) to an earthing point within 1 m from this port. This earthing point should have a low impedance connection to the conductive enclosure of the apparatus cabinet, or similar, where the unit is built-in. This conductive enclosure should be connected to the earthing system of an installation and may be directly connected to the protective earth.
LED Indicators
LED| Status| Description|
---|---|---|---
PWR| ON| In service
OFF| Out of service
TD| ON| Transmitted Data: Displays data received from the local RS-232 port
OFF| No data
RD| ON| Received Data: Displays data leaving the modem on the RS-232 port
OFF| No data
RTS| ON| Status of RTS from the RS-232 interface
OFF| No RTS
CTS| ON| Status of CTS from the RS-232 interface
OFF| No CTS
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).
S2 Below panel, RS-422/485 termination
No termination and fail-safe
Termination with fail-safe (2-wire)
Termination with fail-safe (4-wire)
Note! DIP-switch alterations are only effective after a power on.
Factory settings
Data rate – 9600 bit/s, data format – 10 bitBus format, 2-wire
Note: Switch 1:8 is not used
No termination and fail-safe
Unit specific description
When the converter is set to data-control mode the transmitter is activated by
data on TD (RS-232).The time the transmitter stays active corresponds to one
character-time plus the turning time for the set data rate and number of bits.
If more data arrives on TD before the turning time has expired the transmitter
stays active for an additional one character time and so on. In RTS-control
mode the transmitter is activated by the RS-232 RTS-signal. In this mode the
dip-switches for data rate and number of bits have no effect. The LED
indicators show the status of the data signals. The fail-safe termination
ensures that the signal level at the receiver is in ‘mark state’
(differential>0.2 Volts) when there is no data on the RS-485 bus. Full duplex
is only possible if 4-wires are used.
Field of application
RS-422 and RS-485 were both designed for multidrop applications. When a system
is installed it should always form a bus structure (see diagrams). Star shaped
networks should never be created; there are other Westermo products that can
be used to create star net applications. To install a system according to the
RS-422/485 specification it is
very important that the line is terminated at the correct points. The
recommendation is to terminate the receiver on the master unit and the final
bus slave unit. See diagrams for details of how this is done with RS-485
(2-wire) and RS-422 (4-wire).
N.B. R+/R–, T+/T– definitions are not standard, it can help to shift + and – if the unit does not work.
Line connection
Westermo • Metallverksgatan 6, SE-721 30 Västerås, Sweden
Tel +46 16 42 80 00 Fax +46 16 42 80 01
E-mail: [email protected]
www.westermo.com
References
- Westermo ᐅ Robust and Secure Industrial Networking Solutions
- Product support, user guides and software downloads ᐅ Westermo