Westermo TD-22 AC User manual
PTT Modem
INSTALLATION MANUAL
6177-2203
www.westermo.se
TD-22 AC
TD-22 DC
©Westermo Teleindustri AB • 1998 • REV A
Galvanic
Isolation Transient
Protection CE
Approved
36177-2203
TABLE OF CONTENTS
INTRODUCTION ................................................................................................................................................ 4
SAFETY ................................................................................................................................................................................... 4
SPECIFICATIONS .................................................................................................................................................. 5
INSTALLATION ....................................................................................................................................................... 5
RS-232 CONNECTIONS ........................................................................................................................... 6
LINE CONNECTIONS .................................................................................................................................. 6
TYPICAL TD-22 LINE CONNECTIONS .......................................................................... 7
DIP SWITCH SETUP ............................................................................................................................ 8–10
LED STATUS INDICATORS ............................................................................................................ 11
DTE COMMAND LINES ........................................................................................................................ 12
AT COMMAND SET ....................................................................................................................... 13–32
RESULT CODES .................................................................................................................................................. 33
S-REGISTERS ................................................................................................................................................. 34–42
BLOCK DIAGRAM .......................................................................................................................................... 42
APPLICATION EXAMPLES .................................................................................................... 43–46
GLOSSARY ...................................................................................................................................................... 47–50
46177-2203
Introduction
The Westermo TD-22 is an industrialised dial and leased line modem. This modem has been
developed to be used in industrial applications and has some features you would not expect to find on
a normal modem.
Terminal data rates of up to 19.2 kbit/sec can be handled using data compression and error
correction. Direct mode connections with the maximum line modulation speed of 2,400 bit/sec can
be made.
Lease line 2 and 4 wire connections can be made as well as multidrop half duplex V.23 connections.
The modem can also be used on ordinary twisted pair cables to provide long distance asynchronous
communications.
A watchdog facility continually monitors the power supply and internal hardware as well as the
operational software. In the event of a problem the modem automatically resets. This feature has
been included to make the unit more suitable for use in unmanned locations.
The TD-22 is available in two standard versions for power supply by 230VAC or 12-36VDC. Special
115VAC and 36-55VDC models are also available on request.
Westermo have implemented commands often left out of standard modems like &D to allow
hardware controlled dial out on receipt of a hardware signal and &A to prevent aborts on connection
when extra characters are received.
The TD-22 can handle 11 data bits and has a special 2 stop bit mode to allow the unit to be used in
applications many modems can’t handle.
The TD-22 has been designed with the engineer in mind, hence the extensive information on the
command set, S registers, DIP switched and error codes. We have endeavoured to include all
necessary information however if you need more please do not hesitate to call us.
Safety
This equipment should only be installed by professional service personnel. If the unit is intended for
permanent connection to mains supply, there should be a readily accessible
disconnect device (circuit breaker) incorporated into the fixed wiring.
All ports on this equipment are designed for connection to TNV circuits.
The mains connection is classified as excessive voltage
Description of the above classifications are given in EN60950:1992.
56177-2203
Specifications
Installation
The modem should be
connected in the following
way:
Power connection is made
through screw-block at bottom
right corner.
For 115V AC or 230V AC it is
a 3-pole connector, and for 12-
36 or 36-55V DC a 2-pole
connector
Computers or other equipment
are connected through an
RS-232 connection .
This connection can be made
either to the 25-pole D-sub or
the 9-pole screw connector.
Do not use ribbon cable for
RS-232 connections.
Modulation CCITT V.22bis, 2400 bit/s
CCITT V.22, Bell 212A, 1200 bit/s
CCITT V.21, Bell 103, 300 bit/s
CCITT V.23, 1200/75 bit/s & 1200 Hdx
Dial up Tone signals DTMF
Settings AT-commands & switches
Transmission Asynchronous & Synchronous
Transmission speed, DTE 300, 600, 1200, 2400, 9600, 19200 bit/s
Compression V.42bis & MNP5 (Not leased Line)
Characters up to 11 bits
Error correction V.42, MNP 2-4 & MNP 10 (Not leased line)
Interface EIA RS-232-C/V.24/V.28
Line interface RJ12 or 4-pole screw connector
Line 2-wire for dial up connections
2- or 4-wire for leased line connections
REN, Ringer Equivalence Number 1
Power 230 VAC -10% +15%, 48-62 Hz (TD-22 AC)
12-36 VDC (TD-22 DC)
115 VAC or 36-60 VDC can be delivered as optional
Power consumption 25 mA at 230 VAC
200 mA at 12 VDC
Isolation Between line, RS-232 connection and power 1500V.
Temperature/humidity 5-50°C surrounding temperature
0-95% RH, without condensation
Extended temperature can be delivered as an option
0-95% RH, without condensation Extended temperature can be delivered as an option
Size, mm (W*H*D) 55 * 100 * 128
Weight, kg 0.6 (TD-22 AC) & 0.4 (TD-22 DC)
Indications PWR, LINE, ANS, REL, TD, RD, RTS, DCD, DTR & DSR
Light emitting
diodes
Screw-block
for RS-232
connection
25-pole D-sub
for RS-232
connection
PWR
connection
Line connection
RJ-12
Line connection
screw block
▼▼▼
▼
▼▼
25 Pin Screw Direction Name Description
D-sub Terminal DCE-DTE
1 - - - PE Protective earth
2 8 TXD Transmit data
3 7 RXD Receive data
4 6 RTS Request to send
5 5 CTS Clear to send
6 2 DSR Modem ready
7 1 - - - SG Signal ground
8 4 DCD Data carrier detect
9 Continuous high
10 Continuous low
12 DRS Speed indication (1200/2400)
15 TXC Synchronous TXD clock from modem
17 RXC Synchronous RXD clock from modem
20 3 DTR Data terminal ready
21 RDL Request of remote digital loopback
22 9 RI Ring indicator
23 DRS Data speed select (1200/2400)
24 EXC External synchronous clock
25 TI Test indication signal
66177-2203
RS-232 Connections
Pin outs for the 25-pole D-sub and 9-pole screw terminal:
The other pins in the 25-pole D-sub should be left unconnected.
Line connection
The telephone line is connected to the 6-pole RJ-12
connector or to the 4-pole screw block in the bottom
left side.
When using the screw-block a strap plug supplied must
be placed in the RJ-12 connector. If this is not done the
outgoing signal will not be connected to the screw-
block.
←
←
←
←
←
←
←
←
←
←
←
←
←
←
←
←
←
1
:
6
1 2 3 4
2-wire lines are connected to the two middle pins
(3 & 4) in the RJ-12 plug or the TX screws
(1 & 2).
In the UK modems the RJ-12 connection is on pin
2 & 5.
4-wire lines are connected to the screw terminal,
transmitter to TX (1 & 2) and receiver to RX (3 & 4).
76177-2203
Typical TD-22 line connections
4-position
screw-terminal
Handshaking
Leased line 2-wire
Telephone
exchange Telephone
exchange
Dial up line 2-wire
Telephone modem
4-position
screw-terminal
4-position
screw-terminal
RJ-12 connector
Leased line 4-wire
Telephone
exchange Telephone
exchange
Dial up line 2-wire
Telephone modem
1234567
8
9
The TD-22 is delivered with a factory setting for ”hardware hand-
shake” with RTS-CTS which means that if only TX, RX and GND
are connected no data will be sent on the receiving modem’s RS-232
connection unless RTS is high. The problem can be solved by placing
a jumper between RTS (screw terminal no 6) and for example DSR
(screw terminal no 2) or by disabling the handshake with the command
AT&K0.
3
4
86177-2203
DIP Switch Setup
Disconnect power before changing DIP-switches.
Take ESD-protection when changing switches.
The DIP-switches can be used to provide the following settings.
The DIP-switches are underneath the top lid of the modem. (1 = On, 0 = Off)
Non defined switches will be in off position.
SW1:
4321
0 Dial-up line
1 0 Leased line, switch off echo and result code. Answering
1 1 Leased line, switch off echo and result code. Dialling.
1 All commands ignored, including +++
SW2:
8765 4321
0 SW2:2 to 7 not used
1 For use of SW2:2 to 7
Choice of clock: Clock source:
0 0 Asynchronous
0 1 Synchronous Ext. Clock from D-sub pin 24
1 0 Synchronous Int. The modem creates clock
1 1 Synchronous slave Clock from line
1 DTR/DSR disconnected (AT&S0&D0&C0)
1V.25 commands enabled
1Remote configuration enabled
1Callback security enabled
8765 4321
0 4-wire line connection
1 2-wire line connection
0
1 REL-mode disconnected
SW3:
96177-2203
SW4:
87654321Select speed and parity towards
computer/terminal
0 0 0 0 Automatic speed and format setting up
0 0 0 1 300 Baud
0 0 1 0 600 Baud
0 0 1 1 1200 Baud
0 1 0 0 2400 Baud
0 1 0 1 4800 Baud
0 1 1 0 9600 Baud
0 1 1 1 19200 Baud
0 0 0 7,N
0 0 1 7,E
0 1 0 7,O
0 1 1 8,N
1 0 0 8,E
1 0 1 8,O
1 1 0 8,O* Sets direct-mode AT&Q0
(Used for 8 bits, optional parity)
1 1 1 8,N* Sets direct-mode AT&Q0
(Used for 7 bits, optional parity)
1 2-stop bits
*) The modem use this format when sending information to the DTE only in command mode.
10 6177-2203
8765321Select Line Modulation
0 0 0 Use saved parameters
0 0 1 V.21 300 bps (0-300) ATF1
0 1 0 V.23 Hdx ATF3 %F3
0 1 1 V.23 1200/75 bps ATF3
1 0 0 V.22 1200 bps ATF4
1 0 1 V.22 bis 2400 bps ATF5
1 1 1 Auto-detect mode ATF0
SW5:
116177-2203
LED Status Indicators
PWR: Full Intensity The modem is functioning normally
Half intensity The modem is in test mode or remote
configuration mode
Occasional flashing with speaker click Power supply problem
1:6, on:off ratio RAM error
On/off with speaker click Modem unable to start
LINE LED lights up when the modem has the line
ANS LED flashes when a ring is detected on the line. The ANS indicator shines constantly
when answering an incoming call and remains lit thereafter to indicate the modem is
in autoanswer mode.
REL When the modem is in error correcting and compressing mode this LED is on.When
the modem is in direct or normal mode this LED remains off.
TD Transmitted Data: Shows data received from the local RS-232 port
RD Received Data: Shows data leaving the modem on the RS-232 port
RTS Request to Send signal from the DTE
DCD Data Carrier Detect modem signal
DSR Data Set Ready modem signal
Please also refer to AT&C, AT\N, AT&T, ATS0
This manual suits for next models
1
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