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:
http://www.westermo.com
2
6619-2202
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Safety
Before installation:
This modem is for restricted access area use only.
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.
Maximum 20 A branch circuit protection required.
The product is intended to work with IT power system.
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 voltage by disconnecting the unit from power supply.
Warning! Do not open connected unit. Hazardous voltage may occur within this
unit when connected to power supply or TNV circuits.
Care recommendations
Follow the care recommendations below to maintain full operation of unit and to fulfil
the warranty obligations.
This unit must not be operating with removed covers or lids.
Do not attempt to disassemble the unit. There are no user serviceable parts inside.
Do not drop, knock or shake the unit, rough handling above 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
part may be damaged.
If the unit is not working properly, contact the place of purchase, nearest Westermo
distributor office or Westermo Tech support.
Maintenance
No maintenance is required, as long as the unit is used as intended within the specified
conditions.
The unit interior doesn’t contain any user settable items, all configuration is performed
via the DTE interface with AT-commands.
6619-2202
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Page 4
Agency approvals and standards compliance
TypeApproval / Compliance
EMCEN 61000-6-2, Immunity industrial environm
EN 55024, Immunity IT equipment
EN 61000-6-3, Emission residential environments
FCC part 15 Class B
EN 50121-4, Railway signalling and telecommunications apparatus
IEC 62236-4, Railway signalling and telecommunications apparatus
SafetyEN 60950-1 and UL 60950-1, IT equipment
PSTNCS 03 Part 1, issue 9
FCC part 68, TIA-968-A
ETSI TS103 021-1, ETSI TS103 021-2, ETSI TS103 021-3
AS/ACIF S002, AS/ACIF S006
According to:
TIA-968-A and CS-03 Part 1, issue 9
This equipment complies with Part 68 of the FCC rules and the requirements adopted by the ACTA.
On the left side of this equipment is a label that contains, among other information, a product
identifier in the format US:AAAEQ##TXXXX. If requested, this number must be provided to the
telephone company.
A plug and jack used to connect this equipment to the premises wiring and telephone network must
comply with the applicable FCC Part 68 rules and requirements adopted by the ACTA. A compliant
telephone cord and modular plug is provided with this product. It is designed to be connected to a
compatible modular jack that is also compliant. See installation instructions for details.
Caution-to reduce the risk of fire, use only No.26 AWG or lager telecommunication cable.
The USOC jack required RJ11-C, and the REN is used to determine the number of devices that
may be connected to a telephone line. Excessive RENs on a telephone line may result in the
devices not ringing in response to an incoming call. In most but not all areas, the sum of RENs
should not exceed five (5.0). To be certain of the number of devices that may be connected to a
line, as determined by the total RENs, contact the local telephone company. For products approved
after July 23, 2001, the REN for this product is part of the product identifier that has the format
US:AAAEQ##TXXXX. The digits represented by ## are the REN without a decimal point
(e.g., 03 is a REN of 0.3). For earlier products, the REN is separately shown on the label.
If this equipment TDW-33 causes harm to the telephone network, the telephone company will notify
you in advance that temporary discontinuance of service may be required. But if advance notice
isn't practical, the telephone company will notify the customer as soon as possible. Also, you will be
advised of your right to file a complaint with the FCC if you believe it is necessary.
The telephone company may make changes in its facilities, equipment, operations or procedures that
could affect the operation of the equipment. If this happens the telephone company will provide
advance notice in order for you to make necessary modifications to maintain uninterrupted service.
4
6619-2202
Page 5
If trouble is experienced with this equipment TDW-33, for repair or warranty information, please
contact Westermo Data Communication,Inc. 11200 Westheimer,Suit 900. Houston,TX,,77042.
Phone number: 713-240-0367. If the equipment is causing harm to the telephone network, the
telephone company may request that you disconnect the equipment until the problem is resolved.
There are no repairs the customer/user can perform inside the modem.
In the event of equipment malfunction, all repairs should be performed by our Company or an
authorized agent. It is the responsibility of users requiring service to report the need for service to
our Company or to one of our authorized agents. Service can be facilitated through our office at:
Connection to party line service is subject to state tariffs. Contact the state public utility commission,
public service commission or corporation commission for information.
If your home has specially wired alarm equipment connected to the telephone line, ensure the installation of this TDW-33 does not disable your alarm equipment. If you have questions about what will
disable alarm equipment, consult your telephone company or a qualified installer.
Electrical Safety Advisory:
Parties responsible for equipment requiring AC power should consider including an advisory notice
in their customer information suggesting the customer use a surge arrestor. Telephone companies
report that electrical surges, typically lightning transients, are very destructive to customer terminal
equipment connected to AC power sources. This has been identified as a major nationwide problem.
Westermo Teleindustri AB
SE-640 40 Stora Sundby, Sweden
Herewith declares that the product(s)
Type of product Model Art no Installation manual
DIN-rail Tele modem TDW-33
3619-0001
6619-2201
is in conformity with the following EC directive(s).
No Short name
89/336/EEG Electromagnetic Compatibility (EMC)
73/23/EEG Low Voltage Directive - LVD
References of standards applied for this EC declaration of conformity.
No Title Issue
EN 61000-6-2 Immunity for industrial environments 2 (2001)
EN 55024 Information technology equipment – Immunity 1 (1998)
EN 61000-6-3 Emission standard for industrial environments 1 (2001)
EN 60950 Safety of information technology equipment 6 (2000)
EN 50121-4 Railway signalling and telecommunications apparatus
IEC 62236-4 Railway signalling and telecommunications apparatus
UL 60950-1 Safety – Part 1: General Requirements 1 (2007-07-07)
CSA C22.2 60950-1-03 Safety – Part 1: General Requirements 1 (2006-07)
FCC Part 68 Terminal Equipment to Telephone Network according
to TIA-968-A and CS-03 Part 1, Issue 9
(2006-11-03)
The last two digits of the year in which the CE marking was affixed: 06
Herewith declares that product(s) listed above is in conformity with
Storage & Transport5 to 95% relative humidity non condensing
Operating
2 kVrms 50 Hz 1 min
3 kVrms 50 Hz 1 min
2 kVrms 50 Hz 1 min (@ rated power <60 V)
2 g, 8 – 500 Hz
Page 8
Description
The TDW-33 is designed to function reliably within industrial environments and in areas
of high level interference. The modem has an RS-232 interface supporting terminal data
rates up to 115 kbit/s.
The TDW-33 is a V.90 modem meaning that it can support data rates of up to 56 kbit/s
on the PSTN line side.
The modem is equipped with transient protection on the line side and a “watchdog”
that monitors and automatically resets the modem in the event of a fault. These functions together with remote configuration make the modem perfect for installation at
unmanned sites and prevent the need of costly service trips.
The modem also has password protection, dial-back security and caller ID answering to
ensure that only authorised users can communicate with the modem and any connected
equipment.
The TDW-33 is ideal for industrial applications as it mounts easily on to a 35 mm
DIN-rail, runs from 12–36 VDC power supplies, has screw terminal connections and
is tri galvanically isolated.
For ease of setup the modem is supported by the Westermo TD-tool configuration software. Drivers for Windows setup are also supplied.
… Extended temperature range –25°C to +70°C
… Data rate up to 56 kbit/s (V.90)
… Terminal rate up to 115.2 kbit/s
… DTR and incoming data dialling
… Watchdog
… Secure call back and access
… Industrial environment transient protection on all interfaces
… Up to 11 data bits
… Tri-Galvanic isolation (interface/line/supply)
… Caller ID presentation and answering
… Remote configuration
8
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Interface specifications
Power LV
Rated voltage12 to 48 VDC or 12 to 34 VAC
Operating voltage10 to 60 VDC or 10 to 42 VAC
Rated current150 mA @ 12 VDC
Rated frequencyDC: –
Inrush current I
2
Startup current*0.30 A
PolarityPolarity independent
Isolation toAll other ports 3 kV
ConnectionDetachable screw terminal
Connector size0.2 – 2.5 mm
Shielded cableNot required
* External supply current capability for proper startup
70 mA @ 24 VDC
40 mA @ 48 VDC
150 mA @ 12 VAC
70 mA @ 24 VAC
AC: 48 – 62 Hz
t 0.25 A2s
RS-232 2 kV
peak
rms 50 Hz 1 min
2
(AWG 24-12)
rms 50 Hz 1 min
rms 50 Hz 1 min
RS-232
Electrical specificationEIA/TIA-232
Data rate1 200 bit/s – 115.2 kbit/s
Data format7 or 8 data bits, Odd, even or none parity, 1 or 2 stop bits; S 9-12 bits
ProtocolTransparent
RetimingYes
Transmission rangeCable length < 15 m
Isolation toPower port 3 kV
RS-232 2 kV
rms 50 Hz 1 min
rms 50 Hz 1 min
Connection9-pin D-sub female (DCE) and Detachable screw terminal (DCE )
Connector sizeDetachable screw terminal 0.2 – 2.5 mm
2
(AWG 24 – 12)
Shielded cableNot required **
Conductive housingIsolated to all other circuits
** To minimise the risk of interference, a shielded cable is recommended when the cable is located inside 3 m
boundary to the rails and connected to this port. 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.
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Page 10
RS-232 (DCE)
Position
D-subDirection*Description
No. 1OutData Carrier Direct (DCD)
No. 2OutReceived Data (RD)
No. 3InTransmitted Data (TD)
No. 4InData Terminal Ready (DTR)
No. 5–Signal Ground (SG)
No. 6OutData Set Ready (DSR)
No. 7InRequest To Send (RTS)
No. 8OutClear To Send (CTS)
No. 9OutRing Indicator (RI)
Position
Screw
terminal*
Direction*Description
–Not Connected Data Carrier Direct (DCD)
No. 2OutReceived Data (RD)
No. 1InTransmitted Data (TD)
No. 3InData Terminal Ready (DTR)
No. 5–Signal Ground (SG)
No. 4OutData Set Ready (DSR)
PSTN
Position
RJ-11C Direction* Description
aNot Connected
bNot Connected
cIn/OutPSTN Transmit/ Receive
dIn/OutPSTN Transmit/ Receive
eNot Connected
fNot Connected
D-sub
description
1
2
3
4
5
Product marking
PSTN
LED Indicators
(for details see
next page)
6
7
8
9
* Direction relative this unit.
10
Power LV
Position Direction* Description Product marking
No. 1In–Voltage
No. 2In+Voltage
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LED Indicators
LEDStatusDescription
TD
Transmit data
RD
Receive data
RTS
Request
to send
DCD
Data carrier
detect
DTR
Data terminal
ready
REL
Reliable mode
LINEOFFThe modem is on-hook
PWR
Power
OFFNo data
ON / FLASH The modem receiving data on the DTE interface
OFFNo data
ON / FLASH The modem transmitting data on the DTE interface
OFFRTS signal is inactive
ONRTS signal is active
OFFDCD signal is inactive
ONDCD signal is active, modem has detected a carrier
or the signal is set to always ON
OFFDTR signal is inactive
ONDTR signal is active
OFFReliable mode is OFF, direct or normal mode
ONReliable mode is ON
FLASHReliable mode with error correction and compres-
sion
ONThe modem is off-hook with a established connection
FLASHThe modem is off-hook and negotiating
OFFThe modem has no power
ONThe modem is up and running
FLASHThe modem is in the power-on selftest
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Mounting
CLICK!
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.
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.
10 mm *
(0.4 inches)
25 mm
* Spacing (left/right) recommended for
Removal
Press down the black support at the top of the unit. See figure.
12
full operating temperature range
25 mm
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Windows configuration tool TD-Tool
The TD-Tool is a PC – application program with a graphical interface for easy
configuration of the complex functions found on the encolsed CD or at the Westermo
website.
Please refer to TD-Tool for a complete description of the functionality of the Windows
program.
AT-Commands
Please refer to the AT Commands Interface Guide found on the enclosed CD or at
the Westermo website for a complete list of all available AT-commands and a detailed
description of the serial AT-command interface.
Configuration
The TDW-33 can be configured both from the local DTE interface and remotely over
the PSTN network. Whether the local or remote interface is used the configuration
can be made with AT-commands or with a PC-based application configuration tool.
Basic configurations can also be made with DIP switches locally.Remote configuration
The TDW-33 can be configured from a remote modem. To configure a TDW-33 any GSM,
ISDN or PSTN modem can be used.
The modem used to configure is referred as the “local modem”.
Please make sure that the remote TDW-33 is connected to the PSTN network and is
powered up.
… Connect the local modem to it's media (ISDN, PSTN or GSM)
… Connect the PC's com-port to the DTE interface of the local modem.
… Connect the power supply.
… Start a terminal emulation program (i.e. Windows Hyper-Terminal).
… Configure the local modem data rate and word format.
… Set up a connection to the remote TDW-33 to be configured by using the normal
dial command: ATD<No><CR>. When connected send the remote escape sequence
<++++>. The called remote TDW-33 will acknowledges by requesting the remote
password. Enter the correct password (default: no password, just return). Next; configure the remote TDW-33 using AT-commands. The password for remote configuration is defined with AT*WRCP – Remote configuration password.
… Configure the parameter on the remote TDW-33 from your terminal program and
save the settings with AT&W.
… Hang up the connection using the ATH command.
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Page 14
Application examples
DTR
DSR
DCD
… TDW-33 connected to TDW-33 with DTR signal call
PSTN
Network
Configure the units
AT&FSet the unit to factory default
AT&WStore default settings
Set up the connection – The dialling modem
AT&Z0=nnnStore the number of the remote modem in the dialling TDW-33
AT&S0Set DSR signal always high (if this signal is used to trig the DTR)
AT&B1Activates automatic DTR dialling if DTR switches from low (OFF) to high
AT&WSave settings
Switch DTR from
OFF to ON
Set up the connection – The answering modem
ATAEnter the answer command when RING comes from the network or set up
(ON)
The modem will now dial the phone number stored in the first location of
the telephone number table (AT&Z0=<nnn>)
ATS0=1 to auto answer on 1 RING signal (or more than 1)
NOTE:If no valid DTR signal can be provided by external application, the modems
DSR signal can be used to trig the transmission. Connect the DSR signal via
a relay, or other potential free contact, to the DTR signal. A 10 kohm pull
down resistor should also be connected between the DTR and a signal that
is always low e.g. the DCD.
10 kohm
May be required in harsh environments.
14
Relay
External
application
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… Frequently used settings for PLC-systems
PSTN
Network
Most PLC-systems and other industrial applications where modems are used require the
same changes to the standard settings.
The most commonly encountered problems concern speed, parity and control signals
from the connected equipment.
If this action does not solve the problem the modem’s answering codes and possible
echoing of commands might be the source of the difficulty.
Below follows a list of commands that might resolve the problems. The commands may
of course be placed on one single command line if desired.
Configure the TDW-33 connected to the PLC
AT&FSet the unit to factory default.
ATV0Gives the answering codes in short format. (digits)
ATQ1No result codes are sent on the RS-232/V.24 connection.
ATE0Commands that are sent from the terminal/computer etc. are not echoed
AT&C1DCD will follow the carrier on the line.
AT&K0 No hand shaking.
AT&A1Character abort option on.
AT&WStore default settings.
back to the RS-232/V.24 connection.
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Page 16
… TDW-33 – Secure Call-back
The TDW-33 is connected to a PLC which one want to restrict access to. The TDW-33
can support access control through the Secure Callback function. In this example password and callback to a predefined number is chosen. The modem in the calling end is
here chosen to be a PSTN modem, but can be any of the PSTN, ISDN or GSM modem
from the Westermo product range.
The DTE serial speed between the PLC – TDW-33 and TD-36 – PC is assumed to be
9600 8N1 but can be chosen to fit the actual system requirement.
NO CARRIERWait 10sThe connection is broken and TDW-33
CONNECT 9600TDW-33 dials +4670428000The number programmed correspond-
CONNECT 9600Connection is established between the
The answering modem
TDW-33
requests to TDW-33
to the passwords stored and if
true compare dissconnects.
Comment
Dial the number to TDW-33
Operator/system at
TD-36 enters
Password: n3Y9kA6otYZu8
waits the programmed 10s for TDW-33
to disconnect
ing to the password is dialled, preferable it’s the number to the TD-36
PC at TD-36 and the PLC at TDW-33
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Page 18
… TDW-33 – Silent answering on predefined number
The TDW-33 is connected to a power meter which is remotely monitored. The TDW-33
shares the PSTN line with normal telephones which is preferred not to give a ring signal
when the meter is read.
The TDW-33 is configured to answer calls on the Caller ID received, the valid numbers
to answer is programmed into the TDW-33. There exists a number of standards for sending Caller ID check which standard is used by your operator. The TDW-33 supports the
major implementations of Caller ID. In this example the DTMF Caller ID version is used.
Note that some implementations doesn’t give the possibility to make a silent answer
since the Caller ID is sent between first and second ring signal.
The modem in the calling end is here chosen to be a PSTN modem, but can be any of
the PSTN, ISDN or GSM modem from Westermo product range.