ATL Telex User Manual

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Telex Unit (ATU)

OPERATION & INSTALLATION MANUAL

Information in this document is subject to change without notice and
does not represent a commitment on the part of ATL Telecom Ltd. No
liability is accepted for any consequential losses resulting 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 right to
make changes to this document at any time without notice.

POWER AND TEMPERATURE SPECIFICATIONS

Input Requirements : 230 V~ ±10% 65mA, 50Hz ± 5%
Temperature Range : 0 ~ 40 degrees C.

SAFETY STATEMENTS

1) This apparatus must be installed and maintained by SERVICE
PERSONNEL

2) The mains plug 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 against risk of fire replace with same type and
rating 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 signalling 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 plug
supplied.

WARNING

The lithium battery incorporated inside the ATU unit will react violently
with water and most gases. It is also important that batteries are not
crushed, incinerated or disposed of with normal waste. Therefore the
battery is classed as being NOT USER REPLACEABLE and the equipment
should be returned to the manufacturer or agent 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 copy of the Declaration of Conformity is available upon request
from ATL Telecom Ltd.

1. INTRODUCTION

The ATL Telex Unit (ATU) enables a computer, word processor, or other
intelligent device to operate as a telex terminal, and thus send and
receive messages 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 range 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 changes in its
operating 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 give 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)

Weight: 2.8 Kg.

The unit can accept a mains voltage variation of ± 10% from the
nominal value stated on the unit. The power consumption is between
5W and 15W.

If any doubts arise concerning 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 voltage shown on the rear panel.
Check the paperwork accompanying 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 connecting cable
between the Telex Unit and the Host, including any monitor printer.
Two D-type connectors are required for connection to the Telex Unit.
If the printer connection is not being 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 long. The
chosen site should be secure, dry and avoid exposure to excessive
heat from equipment, room heating devices or direct sunlight. The
front panel should be visible so that the LED displays can be
observed during system operation.

(iv) Connections

Connect the Telex Unit as follows: -

(a) Insert Host connecting cable (25 - pin male D-type connector) and
(optional) monitor printer connecting cable (9 - pin female D-type
connector) into the mating 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 plug 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 light within 5 seconds of
the mains power being connected or the RESET button being
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 extinguished.

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 light after 5 seconds on power up or pressing of the RESET
button, check the mains connection. If the RESET command does not
extinguish 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 checking and flow control is correct (mode of
operation). See section 3 for details.

(vi) Check Message

After the HOST LED's have been extinguished the Telex Unit is ready
for use in accordance with the Telex operating instructions for the
host equipment. If possible a test telex should be sent to another
known location as a check that the system is operating 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 configured 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 during data
transfer.

When the Telex Unit sends (XOFF) the Host must stop sending
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 signal
is used to control the flow of data passed from the Host and DSR to
control the flow of data to the host. The signal is set 'low' to disable
input and high to enable; the same rules apply as for XON/XOFF.

Security Checking by use of ENQ/ACK

This method of security checking involves the regular exchange 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 sending 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 incoming call and
closes the line to incoming calls. This condition is cleared by the Host
sending an (ACK) in response to a later (ENQ).

Security Checking by DSR/DTR

An alternative method of security checking is by use of the DSR/DTR
RS232C interface signals. The Telex Unit will continue to operate
provided the DTR signal is 'high'. If the DTR is low for longer 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 following are the connections available on the Host Port; the unit
is configured 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 following 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 configured by changing the various options in the
unit's software configuration menu accessed from a terminal session
through the Host port. This section contains a complete list of all
current options for both Host and Printer configuration.

If an RS232 terminal or computer, using 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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configuration. However, the terminal or computer that you may be
using to configure the Telex Unit may itself require other interface
signals to be present.

The user or Host program must key in (ESC) Z1 to invoke the
configuration facility. On successful entry the user may key in
parameters indicating the required selections.

It is advisable to first key (ESC) A (reset command) in order to ensure
that the previously stored configuration is currently in operation and
that communication has been correctly established. This can be seen
as the Telex Unit will output the message;
“I: RESET” to a reset command.

Note: The use of upper/lower case letters is of great importance when
making changes in unprompted mode otherwise the wrong
configuration change will be made.

Change Default Configuration (ESC) Z[n]
This feature is used to configure the unit into a mode suitable for a
particular installation. Once configured the parameters will remain
stored in non-volatile memory for immediate use after power-on. The
menu may be accessed from a dumb terminal connected to the Host
port or direct from the Host system if this option is possible.

After sending “(ESC) Z” the Host must send either “0” which means
“no prompts” or “1” which means “prompts”.

The following power-up / software reset defaults may be changed:

A) HOST SPEED: 1)9600 2)4800 3)2400 4)1200 5)600 6)300 7)150 8)110 9)50 <4>
B) HOST DATA BITS: 7)7bits 8)8 bits <8>
C) HOST STOP BITS: 1)1 bit 2)2 bits <1>
D) HOST PARITY: 0)None 1)Odd 2)Even 3)Space 4)Mark <0>
E) HOST SECURITY: 0)ENQ/ACK 1)DSR/DTR <1>
F) HOST FLOW CONTROL: 0)XON/XOFF 1)DSR/DTR <0>
G) PRINTER SELECTED: 0)1010/1040 1)1020/1030 2)GENERIC <1>
H) PRINTER SPEED: 1)9600 2)4800 3)2400 4)1200 5)600 6)300 7)150 8)110 9)50 <4>
I) PRINTER DATA BITS: 5)5 Bits 7)7 Bits 8)8 Bits <8>
J) PRINTER STOP BITS: 1)1 Bit 2)2 Bits 3)1.5 Bits <1>
K) PRINTER PARITY: 0)None 1)Odd 2)Even <0>
L) PRINTER FLOW CONTROL: 0)Xon/Xoff 1)DSR/DTR 2)None <1>
M) GO AHEAD ON BUFFER EMPTY: 0)Disabled 1)Enabled <0>

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R) PRINTER COMPULSORY: 0)No 1)Yes <0>
S) DROP CARRIER ON LINE CLOSED: 0)No 1)Yes <0>
T) AUTOMATIC RESET: 0)No 1)Yes <0>
X) PREVIOUS LINE
Y) DISPLAY COMPLETE CONFIGURATION
Z) EXIT CONFIGURATION
(CR) NEXT LINE

Parameter values as shown in the table above represent the Factory
Default values.

Host Speed (A)

Shows the speed of the Host interface and is normally set up at
installation or automatically by the Host software. In some countries
the range may be restricted to the faster speeds.

Host Data Bits (B)

Shows the number of bits in a byte

Host Stop Bits (C)

Shows the number of stop bits in each byte.

Host Parity (D)

Shows the Parity of each data byte.

Host Security (E)

Shows the security being used by Host computer. (See section 3 for
more information).

Host Flow Control Security (F)

Shows the flow control being used by Host computer. (See section 3
for more information).

Printer Selected (G)

Shows which printer has been selected for connection on the Auxiliary
Port.

Note: ATL will only provide support for its own brand of Baudot or
ASCII Monitor Printers. The current Ascom Baudot Printer is known as
a model 1040 and the current Ascom ASCII Printer is known as a
model 1030. The Ascom ASCII Printer model offers the additional
benefit of printing with two font styles; thereby making is easier to
differentiate incoming calls from outgoing calls when looking at a
printout.

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The Generic option is an unsupported choice. It is provided to allow
users the option of attaching a printer of their own choice.

Printer Speed (H)

Shows the speed of the printer interface.

Printer Data Bits (I)

Shows the number of bits in a byte over the printer interface.

Printer Stop Bits (J)

Shows the number of stop bits in a byte over the printer interface.

Printer Parity (K)

Shows the parity of each data byte over the printer interface.

Printer Flow Control (L)

Shows the flow control being used by the printer.

Go ahead on Buffer Empty (M)

Computers that send data in blocks use this option. After a Block has
been used up (i.e. the buffer is empty) the Telex Unit sends a Go Ahead
(SO) to the Host.

Printer Compulsory (R)

This option indicates whether the presence of the printer overrides
Host security such that continued acceptance of incoming calls is
permitted when the host computer is in fault condition.

Drop Carrier on Line Closed (S)

This option controls the state of the carrier presented to the telex line
under a Closed Line condition. The default value leaves the carrier
enabled in a Closed Line condition.

Automatic Reset (T)

The default value for this option means that a soft reset command,
(ESC) A, is required to put the unit into idle state from a power up
state. This is the normal operation of the telex unit when driven by
most applications. By enabling this option, the telex unit goes directly
on line without requiring a reset command.

Previous Line (X)

Used when in prompted mode for displaying the previous
configuration parameter.

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Display Complete Configuration (Y)

Used when in prompted mode for displaying the complete
configuration table from the beginning.

Exit Configuration (Z)

To exit configuration in both permanent change and temporary
change mode.

Activating the changes

After making changes to the configuration and exit from the
configuration menu, it is necessary to action the new parameters in
the non-volatile memory. This can be done in one of three ways:

1. Press the RESET button,

2. Turn the mains power off, then back on,

3. Send the command <ESC><ESC>! to the unit.

In all cases (except if Automatic Reset option is enabled) the unit will
initialise and send the R: ENTER RESET message to the Host. The unit
is then brought back on line by sending ESC A. If speed changes are
made, these are functional from the start of the output of the R:
ENTER RESET message.

5. LED DISPLAY

The 5 LED's on the Telex Unit front panel provide a visual indication of
the operational state of the unit. Typical examples are,

all LED's off for longer than 5 seconds; no power
all LED's on; Reset command required.
Tx or Rx flashing (Host or Telex); indication of data transfer in

progress on Host or Telex
side.

Any queries regarding the correct operation of the Telex Unit should
be referred to the Host equipment supplier.

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USER RESPONSIBILITIES

TELEX LINE AND STANDBY TELEPRINTER CONNECTION

The UK Telex line is connected to pins 1 and 6 and the standby teleprinter
should be connected to pins 2 and 5. Any cabling used to connect a
standby teleprinter to the ATU should not cause the dc resistance from the
standby teleprinter socket through the ATU to the ATU BS6312 Line plug
to be greater than 5Ω.

For other country variants please contact your host equipment supplier for
advice on connection.

LINE NUMBER AND ANSWERBACK

1. The user is responsible for ensuring that the ATU is

equipped with the line number and answerback agreed with the
PTO for the circuit to which it is connected.

2. The user shall not insert or change the line number and

answerback, but shall approach the supplier for this work to be
undertaken.

3. The user is responsible for ensuring that on any one line only the

line number and answerback allocated for that line by the PTO
are transmitted.

The user is responsible for ensuring that the ATU is used in an
installation that complies with the overall requirements for Receive
Only, Transmit Only or Receive-Transmit telex terminal apparatus.

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THE INFORMATION CONTAINED IN THIS DOCUMENT IS
CONFIDENTIAL TO ATL TELECOM LTD. AND MAY NOT BE DISCLOSED
OR REPRODUCED IN WHOLE OR IN PART WITHOUT THEIR WRITTEN
CONSENT.

© ATL TELECOM LTD. 2003