Vaisala DXL421 User manual

Leased Line Modem
DXL421
USER'S GUIDE
M210636EN-B
February 2005

PUBLISHED BY
Vaisala Oyj Phone (int.): [phone]
P.O. Box 26 Fax: [phone]
FIN-00421 Helsinki
Finland
Visit our Internet pages at http://www.vaisala.com/
© Vaisala 2005
No part of this manual may be reproduced in any form or by any means,
electronic or mechanical (including photocopying), nor may its contents be
communicated to a third party without prior written permission of the copyright
holder.
The contents are subject to change without prior notice.
Please observe that this manual does not create any legally binding obligations for
Vaisala towards the customer or end user. All legally binding commitments and
agreements are included exclusively in the applicable supply contract or
Conditions of Sale.

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VAISALA_________________________________________________________________________ 1
Table of Contents
CHAPTER 1
GENERAL INFORMATION............................................................................ 3
About This Manual ................................................................... 3
Contents of This Manual ....................................................... 3
Safety......................................................................................... 4
General Safety Considerations ............................................. 4
ESD Protection...................................................................... 4
Warranty .................................................................................... 5
CHAPTER 2
PRODUCT OVERVIEW.................................................................................. 7
Introduction to DXL421............................................................ 7
Assembly................................................................................... 7
CHAPTER 3
OPERATION................................................................................................... 9
Installation................................................................................. 9
Mode Settings......................................................................... 10
Operator Commands.............................................................. 11
Point-to-point.......................................................................... 13
Application, DXL421 and ROSA in 2/4-wire point-to-point
Operation............................................................................. 13
Multi-point ............................................................................... 14
Application, DXL421 and ROSA in 2-wire Multi-point
Operation............................................................................. 14
CHAPTER 4
CONTACT INFORMATION .......................................................................... 15
Technical Support .................................................................. 15
Return Instructions ................................................................ 15
CHAPTER 5
TECHNICAL DATA ...................................................................................... 17
Specifications ......................................................................... 17

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List of Figures
Figure 1 DXL421 Leased Line Modem .....................................................8
Figure 2 DXL421 and Terminal.................................................................9
Figure 3 Mode Settings...........................................................................11
Figure 4 DXL421 and ROSA in Leased Line 2-wire Poin-to-point..........13
Figure 5 DXL421 and ROSA in Leased Line 4-wire Point-to-point.........13
Figure 6 DXL421 and ROSA in Leased Line Multi-point ........................14
List of Tables
Table 1 DIL Switch Positions .................................................................10
Table 2 Jumpers X5, X6 and X7............................................................10
Table 3 Carrier Levels ...........................................................................12
Table 4 Power Input...............................................................................17
Table 5 Serial RS-232 Interface ............................................................17
Table 6 PSTN Interfase .........................................................................17
Table 7 Mechanical................................................................................18
Table 8 Environmental...........................................................................18

Chapter 1 _________________________________________________________ General Information
VAISALA_________________________________________________________________________ 3
CHAPTER 1
GENERAL INFORMATION
This chapter provides general notes for the product.
About This Manual
This manual provides information for installing, operating, and
DXL421 Leased Line Modem.
Contents of This Manual
This manual consists of the following chapters:
- Chapter 1, General Information, provides general notes for the
product.
- Chapter 2, Product Overview, introduces the features, advantages
of the product.
- Chapter 3, Operation, contains information that is needed to
operate this product.
- Chapter 4, Contact Information, describes contact information.
- Chapter 5, Technical Data, provides the technical data of DXL421
modem.

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Safety
General Safety Considerations
Throughout the manual, important safety considerations are
highlighted as follows:
WARNING Warning alerts you to a serious hazard. If you do not read and follow
instructions very carefully at this point, there is a risk of injury or
even death.
CAUTION Caution warns you of a potential hazard. If you do not read and
follow instructions carefully at this point, the product could be
damaged or important data could be lost.
NOTE Note highlights important information on using the product.
ESD Protection
Electrostatic Discharge (ESD) can cause immediate or latent damage
to electronic circuits. Vaisala products are adequately protected
against ESD for their intended use. However, it is possible to damage
the product by delivering electrostatic discharges when touching,
removing, or inserting any objects inside the equipment housing.
To make sure you are not delivering high static voltages yourself:
- Handle ESD sensitive components on a properly grounded and
protected ESD workbench. When this is not possible, ground
yourself to the equipment chassis before touching the boards.
Ground yourself with a wrist strap and a resistive connection cord.
When neither of the above is possible, touch a conductive part of
the equipment chassis with your other hand before touching the
boards.
- Always hold the boards by the edges and avoid touching the
component contacts.

Chapter 1 _________________________________________________________ General Information
VAISALA_________________________________________________________________________ 5
Warranty
For certain products Vaisala normally gives a limited one-year
warranty. Please observe that any such warranty may not be valid in
case of damage due to normal wear and tear, exceptional operating
conditions, negligent handling or installation, or unauthorized
modifications. Please see the applicable supply contract or Conditions
of Sale for details of the warranty for each product.

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This page intentionally left blank.

Chapter 2 ___________________________________________________________ Product Overview
VAISALA_________________________________________________________________________ 7
CHAPTER 2
PRODUCT OVERVIEW
This chapter introduces the features, advantages of the product.
Introduction to DXL421
The DXL421 is a leased line modem for the weather stations and other
systems. The operation mode and settings are selectable with the DIL
switch and jumpers. The DXL421 can be used to connect the weather
station to the leased line 2- or 4-wire point-to-point or multi-point
application.
The DXL421 supports standards such as V.21 300 / 300 bps FSK,
V.22 1200 / 1200 DPSK and V.23 1200 /1200 bps FSK.
Assembly
The DXL421 unit has a small enclosure of 20 mm x 80 mm x 76 mm
with DIN rail mounting support that can be connected into various
enclosures. The DXL421 has face connectors where the power supply,
RS-232 and leased line can be connected.

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0410-169
Figure 1 DXL421 Leased Line Modem
The following numbers refer to Figure 1 above:
1 = DIL switch
2 = Power input
3 = RS-232 interface
4 = Leased line interface

Chapter 3 _________________________________________________________________ Operation
VAISALA_________________________________________________________________________ 9
CHAPTER 3
OPERATION
This chapter contains information that is needed to operate this
product.
Installation
Install DXL421 modem onto a DIN rail. Make sure that connection
between the DIN rail and the grounding point is good. Surge
protection is included in DXL421.
0410-170
Figure 2 DXL421 and Terminal
Connect the leased line cable to DXL421 LINE interface screw
terminal connector.
Connect the serial cable between DXL421 and PC COM port or
ROSA, MILOS, MAWS or etc.

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Connect the power to DXL421. Make sure that polarity of power
cable is correct. The over-voltage, short-circuit and reverse connection
protection are included in DXL421.
When the power is switched ON, the DXL421 sends a following
response to serial line:
DXL421 V1.02 2004-07-28
MODE: ORIG 1200b DPSK LEVEL -6.0dB
Here V1.02 2004-07-28 is the firmware version and the second row
corresponds to the mode settings according to the DIL switch position.
Mode Settings
The operation mode is set by a four positions DIL switch. The 2/4-
wire mode is set by jumpers X5 - X7. The DIL switch is located on
top of the housing and jumpers are located inside of the housing. A
side-label shows the settings of the modem.
The factory default settings are 2-wire, originate, 1200 baud, -6db.
Table 1 DIL Switch Positions
Number ON OFF
1. Originate Answer
2. 1200 baud 300 baud
3. Carrier Level 0 db Carrier Level -6 db
4. Speed buffer 9600 baud
Table 2 Jumpers X5, X6 and X7
Jumper 2-wire 4-wire
X5 1-3 and 2-4 3-5 and 4-6
X6 1-3 and 2-4 3-5 and 4-6
X7 1-3 and 2-4 3-5 and 4-6

Chapter 3 _________________________________________________________________ Operation
VAISALA________________________________________________________________________ 11
0410-171
Figure 3 Mode Settings
Operator Commands
To operate with a DXL421 the user has to open the RS-232 serial line
into the command mode by the command XOPEN DXL {id}. Prior to
this command the user has to press ENTER once, which will wake up
the RS-232 serial line.
XOPEN DXL {id}
{id} marks the address of DXL421 modem. The valid id range is from
0 to 99. The factory default id is 1. The response from DXL421 will
follow.
DXL OPENED FOR OPERATOR COMMANDS
PAR
This command displays the parameters.
DXL PARAMETERS
DXL421 V1.02 2004-07-28
ID STRING: 1
SERIAL NUMBER: Z19414
MODEM ORIG 1200b DPSK
BAUD: 9600
CARRIER LEVEL: 3 -6.0dB

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ID {id}
This command displays and sets the identification address of a
DXL421 modem.
BAUD: 9600
SERN {serial number}
This command displays and sets the serial number of a DXL421
modem.
SERIAL NUMBER: Z19414
BAUD
This command displays and sets the serial line speed buffer. 1200,
2400, 4800 and 9600 are available baud rates, the factory default is
9600 baud. The speed buffer mode has to be activated by the DIL
switch before using the BAUD command. This command does not
change modem line speed.
BAUD: 9600
LEVEL {level}
This command displays and sets the carrier level of the DIL/3 switch
"OFF" position. The DIL/3 switch "ON" position sets always the
carrier level 0 db.
Table 3 Carrier Levels
Command Description
Level 0 Carrier level -10.5db
Level 1 Carrier level -9.0db
Level 2 Carrier level -7.5db
Level 3 Carrier level -6.0db
Level 4 Carrier level -4.5db
Level 5 Carrier level -3.0db
Level 6 Carrier level -1.5db
Level 7 Carrier level 0db
CARRIER LEVEL: 3 -6.0dB
CLOSE
This command closes the operator mode of the serial line.
LINE CLOSED

Chapter 3 _________________________________________________________________ Operation
VAISALA________________________________________________________________________ 13
Point-to-point
The DXL421 can be used in the leased line mode 2- or 4-wire point-
to-point application.
Application, DXL421 and ROSA in
2/4-wire point-to-point Operation
PC/DTE and DXL421: Set DXL421 mode as follows; originate, 1200
baud and -6.0db. Set PC/DTE serial port 1200 baud (if DXL421 is set
DIL/4 ON Speed buffer 9600 mode then set PC/DTE serial port 9600
baud).
DRI511/521 and DXL421: Set DXL421 mode as follows; answer,
1200 baud and -6.0db. Set the DRI511/521 interface card's serial port
to RS-232 1200 baud and fixed mode.
0410-172
Figure 4 DXL421 and ROSA in Leased Line 2-wire Poin-to-
point
0410-173
Figure 5 DXL421 and ROSA in Leased Line 4-wire Point-to-
point

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Multi-point
The DXL421 can also be used in the leased line mode multi-point
application.
Application, DXL421 and ROSA in
2-wire Multi-point Operation
PC/DTE and DXL421: Set DXL421 mode as follows; originate, 1200
baud and -6.0db. Set PC/DTE serial port 1200 baud (if DXL421 is set
DIL/4 ON Speed buffer 9600 mode then set PC/DTE serial port 9600
baud).
DRI511/521 and DXL421: Set DXL421 mode as follows; answer,
1200 baud and -6.0db. Connect a wire from DRI511/521 RTS to
DXL421 RTS. Set the serial port of DRI511/521 interface card to RS-
232 1200 baud and fixed mode.
0410-174
Figure 6 DXL421 and ROSA in Leased Line Multi-point

Chapter 4 _________________________________________________________ Contact Information
VAISALA________________________________________________________________________ 15
CHAPTER 4
CONTACT INFORMATION
This chapter describes contact information.
Technical Support
For technical questions, contact the Vaisala technical support:
E-mail [email protected]
Phone (int.) [phone]
Fax [phone]
Return Instructions
If the product needs repair, please follow the instructions below to
speed up the process and avoid extra costs.
1. Read the warranty information.
2. Write a Problem Report with the name and contact information
of a technically competent person who can provide further
information on the problem.
3. On the Problem Report, please explain:
- What failed (what worked / did not work)?
- Where did it fail (location and environment)?
- When did it fail (date, immediately / after a while /
periodically / randomly)?
- How many failed (only one defect / other same or similar
defects / several failures in one unit)?

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- What was connected to the product and to which connectors?
- Input power source type, voltage and list of other items
(lighting, heaters, motors etc.) that were connected to the
same power output.
- What was done when the failure was noticed?
4. Include a detailed return address with your preferred shipping
method on the Problem Report.
5. Pack the faulty product using an ESD protection bag of good
quality with proper cushioning material in a strong box of
adequate size. Please include the Problem Report in the same
box.
6. Send the box to:
Vaisala Oyj
Contact person / Division
Vanha Nurmijärventie 21
FIN-01670 Vantaa
Finland

Chapter 5 _____________________________________________________________ Technical Data
VAISALA________________________________________________________________________ 17
CHAPTER 5
TECHNICAL DATA
This chapter provides the technical data of DXL421 modem.
Specifications
Table 4 Power Input
Property Description / Value
Supply voltage +5 to +30 VDC
Power consumption 0.09 W
Fuse 0.5A PTC
Transient protection Yes, transil diode
Reverse connect protection Yes
Connector 2-pos screw terminal
Indicator One green LED power on
Table 5 Serial RS-232 Interface
Property Description / Value
Topology RS-232C interface
Serial port speed 300 to 57600 baud
Connector 6-pos screw terminal
Indicators Three orange LEDs CD, TxD and RxD
Table 6 PSTN Interfase
Property Description / Value
Modem compatibility V.21 300 / 300 bps FSK, V.22 1200 / 1200
DPSK and V.23 1200 /1200 bps FSK.
2- or 4-wire, point-to-point or multi-point
Transient protection Yes, 350V surge arrester, PTC-fuses,
sidactor
Isolation 1500V
Connector 4-pos screw terminal

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Table 7 Mechanical
Property Description / Value
Housing material EN AW-1050A aluminium, gray anodized
Housing classification IP30 (NEMA 1)
Dimensions 25x80x76mm
Weight 94 g
Table 8 Environmental
Property Description / Value
Operating temperature -40°C ... +55°C
Storage temperature -60°C ... +75°C
Humidity 0 to 100% RH, non-condensing
EMC EN 55022
Immunity
ESD EN 61000-4-2, contact dis. 4kV, air dis. 8kV
RF field EN 61000-4-3
Fast transient bursts (EFT) EN 61000-4-4
Transient surges EN 61000-4-5
Conducted RF EN 61000-4-6
Vibration IEC 68-2-64 Fh, 10 ... 500 Hz, up to 2.0 G
Free fall IEC 68-2-32 Ed, fall height 1000 mm
Cold IEC 68-2-1, -40°C 16 hours
Heat IEC 68-2-2, +55°C 16 hours
Slow change of
temperature, 1°C/min
IEC 68-2-14, -40°C to +55°C, two cycles