ATL ATU Telex Unit Specification sheet

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Telex Unit (ATU)

OPERATION & INSTALLATION MANUAL
Information in this document is subject to chan e without notice and
does not represent a commitment on the part of ATL Telecom Ltd. No
liability is accepted for any consequential losses resultin from errors or
omissions from this document.
Head Office/ Sales & Support Office
ATL Telecom Limited
Cypress Drive
St. Mellons
Cardiff
CF3 0EG
UK
Tel: [phone]
Fax: [phone]
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ATL Telecom
Telex Unit (ATU)
OPERATION AND INSTALLATION MANUAL
CONTENTS:
CE COMPLIANCE STATEMENTS
SAFETY INSTRUCTIONS
EMC WARNING STATEMENTS
1. INTRODUCTION
2. INSTALLATION STEPS
3. HOST SIDE CONNECTION DETAILS
4. CONFIGURATION
5. LED DISPLAY
6. USER RESPONSIBILITIES
ATL Part No. 1/267/000/610 ISSUE 4
March 2003

ATL TELEX UNIT (UK) : CE COMPLIANCE STATEMENTS
NOTE: The information contained in this document is supplied without
liability for errors or omissions. ATL Telecom Limited reserves the ri ht to
make chan es to this document at any time without notice.
POWER AND TEMPERATURE SPECIFICATIONS
Input Requirements : 230 V~ ±10% 65mA, 50Hz ± 5%
Temperature Ran e : 0 ~ 40 de rees C.
SAFETY STATEMENTS
1) This apparatus must be installed and maintained by SERVICE
PERSONNEL
2) The mains plu on the equipment serves as the disconnect device,
therefore a socket outlet shall be installed near the equipment and
shall be easily accessible.
3) For continued protection a ainst risk of fire replace with same type and
ratin fuse.
4) The TELEX LINE connection has a safety status of TNV3; the Host and
Printer (AUX) Interface port (D-Type) connections have a safety status
of EARTHED SELV and the mains connection has an EARTHED
HAZARDOUS VOLTAGE STATUS.
SYSTEM SPECIFICATION
The ATU is defined as a Front End Telex Terminal Apparatus (FE- TTA) with
an intermediate Telex Terminal Apparatus (1- TTA) built in.
Not more than one Intermediate Telex Terminal Apparatus (1- TTA) may be
connected between a telex terminal and the telex network.
As the ATU contains an (1-TTA) no further (1-TTA) may be connected
between the ATU and the Telex Network.
The ATU supports both PTS and CSCS si nallin provided on lines supplied
by BT and Mercury.
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EMC STATEMENTS
WARNING This is a Class A product. In a domestic environment this
product may cause radio interference in which case the user may be
required to take adequate measures.
DURING INSTALLATION DO NOT DISCARD ANY CONNECTOR COVERS
To ensure continued compliance with the ESD criteria ensure any port or
connector that is not in use is protected by the cover or dummy plu
supplied.
WARNING
The lithium battery incorporated inside the ATU unit will react violently
with water and most ases. It is also important that batteries are not
crushed, incinerated or disposed of with normal waste. Therefore the
battery is classed as bein NOT USER REPLACEABLE and the equipment
should be returned to the manufacturer or a ent if battery replacement is
required.
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MANUFACTURERS DECLARATION*
ATL Telecom Ltd declares that this product is in conformity
with the essential requirements of the ‘R&TTE directives
1999/5/EC’
*A co y of the Declaration of Conformity is available u on request
from ATL Telecom Ltd.

1. INTRODUCTION
The ATL Telex Unit (ATU) enables a computer, word processor, or other
intelli ent device to operate as a telex terminal, and thus send and
receive messa es over the national and international telex network.
The computer or word processor to which the Telex Unit is connected
is referred to as the Host equipment. The interface to the Host
equipment is CCITT V24/V28 (equivalent to EIA RS 232-C).
The Telex Unit can operate with a variety of different Host software
applications and across a ran e of Host equipment. Since there are
variations in the pin connections on the interface of the Host
equipment, it is the responsibility of the installer to provide the
connection cable between the Telex Unit and the Host equipment.
These instructions should also be read in conjunction with any
installation instructions issued by the Host equipment manufacturer.
There is only one control on the Telex Unit, the RESET button that
allows the user to execute a hardware reset of the Telex Unit.
Commands from the Host carry out any other necessary chan es in its
operatin mode. These include a reset command, which must be
entered each time the Telex Unit is powered up, or the RESET button
is pressed and each time a reset (fault) condition is indicated.
Five LEDs on the Telex Unit ive indications of Run/Reset condition and
of transfers in each direction on the telex line and on the host
interface.
The physical characteristics of the ATL Telex Unit are as follows: -
Size: 250mm x 275mm x 60mm (W x D x H)
Wei ht: 2.8 K .
The unit can accept a mains volta e variation of ± 10% from the
nominal value stated on the unit. The power consumption is between
5W and 15W.
If any doubts arise concernin the operation of the Telex Unit,
reference should be made to the host equipment supplier.
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2. INSTALLATION STEPS
(i) Preliminary
Check the mains volta e shown on the rear panel.
Check the paperwork accompanyin the Telex Unit to ensure that,
(a) the serial number corresponds
(b) the answerback is correct
(c) the host interface baud rate and mode are correct (see section 4).
No attempt should be made to install a Telex Unit if an error is
suspected.
(ii) Host Cable
It is the responsibility of the installer to provide the connectin cable
between the Telex Unit and the Host, includin any monitor printer.
Two D-type connectors are required for connection to the Telex Unit.
If the printer connection is not bein used, the D-Type Connector
Cover provided must be left fitted.
(iii) Location
Select a position for the Telex Unit that is within cable reach of the
mains supply, host equipment, telex line termination and standby
teleprinter (if installed). The mains lead and telex connections
provided with the Telex Unit are approximately 2 meters lon . The
chosen site should be secure, dry and avoid exposure to excessive
heat from equipment, room heatin devices or direct sunli ht. The
front panel should be visible so that the LED displays can be
observed durin system operation.
(iv) Connections
Connect the Telex Unit as follows: -
(a) Insert Host connectin cable (25 - pin male D-type connector) and
(optional) monitor printer connectin cable (9 - pin female D-type
connector) into the matin connectors at the rear of the Telex Unit.
Connect the other ends of these cables to the Host and monitor
printer.
(b) Make connections to the telex line and standby teleprinter (if
installed) via the line plu and teleprinter socket (if installed). Refer to
Appendix A for U.K. connection details.
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(v) Reset of Telex Unit
Check that the all LED's on the Telex Unit li ht within 5 seconds of
the mains power bein connected or the RESET button bein
pressed. Check that the host equipment is powered up. Send the
Reset Command (ASCII characters ESCAPE A) from the host
equipment to the Telex Unit and check that the RUN LED is still lit,
and the host LED's are extin uished.
Note that a Reset command is required on each occasion that the
Telex Unit is powered up or reset via the RESET button. If the LED's
do not li ht after 5 seconds on power up or pressin of the RESET
button, check the mains connection. If the RESET command does not
extin uish the Host LED's, check the host and its connection to the
Telex Unit. Check the baud rate is set correctly in the Telex Unit and
the method of security checkin and flow control is correct (mode of
operation). See section 3 for details.
(vi) Check Message
After the HOST LED's have been extin uished the Telex Unit is ready
for use in accordance with the Telex operatin instructions for the
host equipment. If possible a test telex should be sent to another
known location as a check that the system is operatin correctly.
3. HOST SIDE CONNECTION DETAILS
RS232C Host connection
(a) 3-Wire
This uses only the connections Tx, Rx and Common as the interface
between the Host and the Telex Unit. For this mode of operation the
unit must be confi ured with XON/XOFF flow control and ENQ/ACK
data security.
(b) 5-Wire (XON)
This uses Tx, Rx, Common, DSR and DTR as the interface between the
Host and the Telex Unit. With this type of interface the DSR/DTR lines
are used for data security. XON/XOFF are used for flow control
(c) 5-Wire DTR
As (b) but uses DSR/DTR for security and flow control.
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Flow Control by XON/XOFF
The flow of data in each direction is controlled by the inclusion of
control characters in the data. The characters used are Enable Input
(XON, ASCII DC 1) and Disable Input (XOFF, ASCII DC3). The characters
can be sent at any time and are not restricted to use only durin data
transfer.
When the Telex Unit sends (XOFF) the Host must stop sendin
characters to the Telex Unit. The Telex Unit will successfully receive a
number of characters (at least 10) before data transfer ceases. If the
Host continues to send data in excess of this Telex Unit assumes a Host
fault.
Flow Control by DSR/DTR
Alternative method of flow control but uses DSR/DTR. The DTR si nal
is used to control the flow of data passed from the Host and DSR to
control the flow of data to the host. The si nal is set 'low' to disable
input and hi h to enable; the same rules apply as for XON/XOFF.
Security Checking by use of ENQ/ACK
This method of security checkin involves the re ular exchan e of
control characters between the Telex Unit and the Host. The Telex Unit
sends a Confidence Check enquiry character (ENQ) to the Host and
expects to receive an OK character (ACK) in response. After sendin an
(ENQ) the Telex Unit checks to see if an (ACK) has been received. The
Host must reply within 10 seconds (5 seconds in U.K.) otherwise a fault
in the Host is assumed and the line is cleared.
If the Host is not ready to receive data it sends a Not OK character
(NAK) response. In this case the Telex Unit clears any incomin call and
closes the line to incomin calls. This condition is cleared by the Host
sendin an (ACK) in response to a later (ENQ).
Security Checking by DSR/DTR
An alternative method of security checkin is by use of the DSR/DTR
RS232C interface si nals. The Telex Unit will continue to operate
provided the DTR si nal is 'hi h'. If the DTR is low for lon er than 10
seconds (5 seconds in U.K.) the Telex Unit will assume there is a Host
fault.
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Host Connection
The followin are the connections available on the Host Port; the unit
is confi ured as a DCE. The cable from the Host computer should
terminate in a 25-pin Male D-type connector.
Pin Host
1 Earth
2 Tx (to the unit)
3 Rx (from the unit)
4 RTS (to the unit)
5 CTS (from the unit)
6 DSR (from the unit)
7 0V (common)
20 DTR (to the unit)
AUX Connection
The followin are the connections available on the AUX Port. The
cable from the printer should terminate in a 9-pin Female D-type
connector.
Pin AUX
1 Earth
2 Rx (from unit to printer)
3 TX (not used in printer mode)
4 DTR (to the unit)
5 0V (common)
6 DSR (from the unit)
7 RTS (to the unit)
4. CONFIGURATION
Configuring the ATL Telex Unit
The ATL Telex Unit is confi ured by chan in the various options in the
unit's software confi uration menu accessed from a terminal session
throu h the Host port. This section contains a complete list of all
current options for both Host and Printer confi uration.
If an RS232 terminal or computer, usin asynchronous
communication, is connected to the Host connector, only Tx, Rx,
Ground and DTR connections are required by the Telex Unit for
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