Westermo TD-32 User Manual

	32/485
-
TD		32
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TD

Galvanic	Transient	CE	Westermo Teleindustri AB • 2000 • REV. A
			©
Isolation	Protection	Approved

Tele modem

V.32bis

www.westermo.se

Table of Contents
Introduction .....................................................................................................................................................................	4
Safety ..........................................................................................................................................................................................	4
Specifications ..................................................................................................................................................................	5
Installation ..........................................................................................................................................................................	6
RS-232/V.24 Connections ...........................................................................................................................	7
Line Connection ........................................................................................................................................................	7
Typical TD-32 Line Connections .....................................................................................................	8
TD-32/485 (RS-422/485 interface) ................................................................................................	9
DIP Switch Setup ....................................................................................................................................	10–13
LED Status Indicators ...................................................................................................................................	13
DTE Command Lines ....................................................................................................................................	14
AT Command Set....................................................................................................................................	15–34
Result Codes ..............................................................................................................................................................	35
S-Registers .........................................................................................................................................................	36–45
Application Examples ......................................................................................................................	46–49
Glossary ................................................................................................................................................................	50–53

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3

Introduction

The Westermo TD-32 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 57.6 kbit/sec can be handled using data compression and error correction. The maximum line modulation speed is 14,400 bit/sec (V.32bis).

Leased line connections can be made on 2 or 4 wires. 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-32 is available in two standard versions for power supply by 230V AC or 12–36VDC. Special 115V AC and 36–60V DC models are also available on request.

Westermo have implemented commands often left out of standard modems. Two examples of these Westermo specific AT-commands are &D and &A (see AT-command description for further information).

The TD-32 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-32 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.

Line connections 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.

The TD-32DC shall only be installed to a power supply of the type SELV.

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Specifications

Modulation	CCITT V.32bis, 4 800 till 14 400 bit/s
	CCITT V.32, 4 800/9 600 bit/s
	CCITT V.22bis, 2 400 bit/s
	CCITT V.22, Bell 212A, 1200 bit/s
	CCITT V.21, Bell 103, 300 bit/s
Dial up	Tone signals DTMF
Settings	AT-commands & switches
Transmission	Asynchronous & Synchronous

Transmission speed, DET 300, 600, 1 200, 2 400, 9 600, 19 200, 38 400 & 57 600 bit/s

Compression	V.42bis & MNP5
Characters	Up to 11 bitar
Error correction	V.42, MNP 2-4 & MNP 10
Interface	EIA RS-232-C/V.24. RS-422/485 is an option
Line interface	RJ12 or 4-pole screw connector
Line	2-wire for dial up connections
	2- or 4-wire for leased line connections
REN,	1
Ringer Equivalence Number
Power supply	230V AC –10 – +15%, 48–62 Hz (TD-32 AC)
	12–36V DC (TD-32 DC)
	115V AC or 36–60V DC can be delivered as optional
Power consumption	25 mA at 230V AC
	200 mA at 12V DC
Isolation	Between line, RS-232 connection and power 1500V
Fuse	AC 100mA, DC 1.6A
Temperature	5–50°C surrounding temperature
Humidity	0–95% RH, without condensation
Dimensions	55x100x128 mm (WxHxD)
Weight	0.6 kg (TD-32 AC) & 0.4 kg (TD-32 DC)
Indications	PWR, LINE, ANS, REL, TD, RD, RTS, DCD, DTR & DSR
Mounting	On 35 mm DIN-rail

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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 36–60V DC a 2-pole connector.

Computers or other equipment are connected through an RS-232/V.24 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.

Light emitting diodes

Line connection RJ-12

Line connection screw block

▼

9	8	7	6	5	4	3	2	1
▼
								▼
▼

▼

▼

Screw-block for RS-232/V.24 connection

25-pole D-sub for RS-232/V.24 connection

PWR

Connection

6

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RS-232/V.24 Connections

Pin outs for the 25-pole D-sub and 9-pole screw terminal:

25-pos.	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 loop back
22	9	←	RI	Ring indicator
23		←	DRS	Data speed select (1200/2400)
24		←	EXC	External synchronous clock
25		←	TI	Test indication signal

The other pins in the 25-pole D-sub should be left unconnected.

1

:

6

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 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 2-wire line is connected to pin 2 & 5 in the RJ-12 connector.

4-wire lines are connected to the screw terminal, transmitter to TX (1 & 2) and receiver to RX (3 & 4).

12345678

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Typical TD-32 line connections

4-position screw terminal

Leased line 2-wire

4-position screw terminal

Leased line 4-wire

Handshaking

9

8

7

6

5

4

3

2

1

The TD-32 is delivered with a factory setting for “hardware handshake” 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, or with switch 3:2 (switch settings).

Telephone	Telephone	Telephone
Exchange	Exchange	modem

wire

RJ-12 kontakt

3

4

		Telephone			Telephone		Telephone
		Exchange			Exchange		modem

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TD-32/485 (RS-422/485 interface)

As an option the TD-32 can be supplied with an RS-422/485 interface. This product is referred to as the TD-32/485.

On the TD-32/485 the RS-232/V.24 connection on the screw terminal on upper front side of the unit has been replaced with an RS-422/485 interface. All other features remain identical between the standard TD-32 and TD-32/485. The TD-32/485 can still be connected to an RS-232/V.24 port using the 25-pole D-sub. Please note that there is no galvanic isolation between the RS-232 and the RS-422/485 ports so they should not be connected simultaneously.

The RS-422/485 connections are made as shown below. Please note that the selection of 2 or 4 wire and termination or no termination is done by linking between some of the screw terminals.

Connection

RS-422

4-wire

9	8	7	6	5	4	3	2	1
S1	2/4	T2	T4 GND T-			T+	R-	R+
	WIRE					RS 422/485
			PWR		V24/RS232-C
			TD
			RD
			RTS
			DCD
			LINE

Connection

RS-485

9	8	7	6	5	4	3	2	1
S1	2/4	T2	T4 GND T-			T+	R-	R+
	WIRE					RS 422/485
			PWR		V24/RS232-C
			TD
			RD
			RTS
			DCD
			LINE

Termination

4-wire

9	8	7	6	5	4	3	2	1
S1	2/4	T2	T4 GND T-			T+	R-	R+
	WIRE					RS 422/485
			PWR		V24/RS232-C
			TD
			RD
			RTS
			DCD
			LINE

Termination

2-wire

9	8	7	6	5	4	3	2	1
S1	2/4	T2	T4 GND T-			T+	R-	R+
	WIRE					RS 422/485
			PWR		V24/RS232-C
			TD
			RD
			RTS
			DCD
			LINE

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TD-32/485

9	8	7	6	5	4	3	2	1
S1	2/4	T2	T4 GND T-			T+	R-	R+
	WIRE					RS 422/485
			PWR		V24/RS232-C
			TD
			RD
			RTS
			DCD
			LINE
			ANS
			REL

9

DIP Switch Setup for Dial-up and Leased Line

Disconnect power before changing DIP-switches.

Use 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. Non defined switches will be in off position.

9

8

7

6

5

4

3

2

1

Switch 1

ON

Standard dial-up line

1 2 3 4

ON

Leased line, Answering

ON

Leased line, Originating

ON	Do not abort if unwanted characters
	are received when connecting
ON	Escape sequence disabled
1 2 3 4 (All commands ignored in on-line mode)

Related

AT-commands

(ATE0Q1&C1&A1)

(ATE0Q1&C1&A1)

(AT&A1)

(ATE0Q1&C1)

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Switch 2

Related

AT-commands

ON

1 2 3 4 5 6 7 8

ON

For use of SW2:2 to 7

1 2 3 4 5 6 7 8

ON

Asynchronous communication

1 2 3 4 5 6 7 8

Synchronous, external clock.

Clock from D-sub pin 24

Synchronous, internal clock,

The modem creates the clock

slave.

(AT&S0&D0&C0)

Switch 3

Related

AT-commands

ON

1 2 3 4 5 6 7 8

ON

1 2 3 4 5 6 7 8

ON

1 2 3 4 5 6 7 8

ON

1 2 3 4 5 6 7 8

2-wire line connection
Flow control OFF	(AT&K0)
REL-mode disconnected	(AT\N0)
Speaker always OFF	(ATM0)
	(ATQ1E0&C1&K0&A1)
state	(AT&C1)
disabled and	%E0

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Switch 4 (Serial speed and format)

Related

AT-commands

ON

1 2 3 4 5 6 7 8

ON

300 bit/s

1 2 3 4 5 6 7 8

ON

600 bit/s

1 2 3 4 5 6 7 8

1 200 bit/s

2 400 bit/s

(AT\N1)

(AT\N1)

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Switch 5 (line modulation)		Related
ON
1 2 3 4 5 6 7 8
ON		(ATF1)
V.21; 300 bit/s
1 2 3 4 5 6 7 8
ON		(ATF4)
V.22; 1 200 bit/s
1 2 3 4 5 6 7 8
V.22bis;	2 400 bit/s	(ATF5)
V.32bis;	4 800 bit/s	(ATF6)
		(ATF7)
		(ATF8)
		(ATF9)
		(ATF10)
		(ATF0)

LED Status Indicators

PWR	Full Intensity	The modem is functioning normally
	Half intensity	The modem is in test 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 auto answer mode.
REL	LED flashes when the modem is in both error correcting and compressing mode.
	When the modem is only in error correcting mode this LED is on.
	When the modem is in direct or normal mode this LED remains off.
TD	Transmitted Data: Displays data received from the local RS-232/V.24 port
RD	Received Data: Displays data leaving the modem on the RS-232/V.24 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

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DTE Command Lines

In order to send commands to the modem, a prefix must be entered before the actual command(s). This prefix is the ASCII string ‘AT’, which is an abbreviation for attention.

Commands may be entered in either upper or lowercase characters. The only exception is the prefix ‘AT’; both characters in this string must be of the same case.

Several commands may be entered on the same command line with or without space in between. The command lines shall always be terminated by a carriage return (with the exception of the ‘A/’command).

The command consists of a single letter or a letter with the characters %, &, \, ( or * in front.

At Swedish terminals which lack \ in the character set Ö is used instead. After each command there might be a parameter, most often a numerical value. Most parameter values are written to a memory in the modem, an S-register. Different registers are effected depending on which command has been used.

Commands and appurtenant parameters are sent to the modem through the serial port on the modem. This must be connected to a terminal, a computer with a communication software or other equipment which is able to send asynchronous, serial information. Each time ”AT” is sent to the modem it will analyse which speed and parity is being used and will then switch to the serial port. In this modem it is also possible to use DIP-Switches to set the most common parameters and also set the modem so that it will not react on commands coming through the serial port.

In the description of commands it is written ”Default” within brackets after some commands, this means that the command has this value when reset to the factory parameters (AT&F).

When communication is established with another modem it is still possible to reach the command mode by sending an ”escape” sequence to the modem. This sequence consists of an interruption in communication, after which three characters is sent, most often plus (+++) and after which it is silent again. The silent periods are there to prevent that a text, containing this sequence, when sent will interrupt the connection. The silence is usually 1 second, but can be changed in register S12.

Also the character can be changed, in register S2.

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Description of commands

The modem can be configured and controlled with the AT-commands listed below.

A/ – Re-execute command

This command differs from the others since it will not be preceded by ”AT” and also not terminated by ENTER.

A – Answer

The modem will wait for a carrier for the time that was specified in S7.

Please also refer to ATDn, S0, S1, S7, S8, S9, S30

\An – Select Maximum MNP Block Size

This command controls the size of data blocks used during connections with MNP, error corrected links. The value is written to S40 bit 6 and 7.

\A0	64 characters.
\A1	128 characters.
\A2	192 characters. (Default)
\A3	256 characters.

Please also refer to AT\N

&An – Interrupt connection negotiation

Usually the modem will abort the connection negotiation if characters are sent to the serial port during negotiation phase.

This command gives a possibility to ignore incoming characters.

&A0	Abort connection negotiation when characters are sent to the serial port. (Default)
&A1	The modem will ignore characters on the serial port during negotiation phase.

Please also refer to AT&D

Bn – Selecting CCITT or BELL

For historical reasons the American standard for 300 and 1200 baud is different than the international.

B0	CCITT-mode (European standard) (Default)
B1	BELL-mode (American phone company)

Please also refer to ATFn, S27

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&Bn – DTR Dial Option

This command enables the modem to dial a number stored with &Zn=number when the DTR signal goes from inactive to active signal level.

&B0	No automatic call with DTR. (Default)
&B1	Call on DTR.

Please also refer to AT&Z, AT&D

\Bn – Transmit Break to Remote

The command controls the length of the break-signal, in a non-error correction mode. The length is depending of the value n and is in multiples of 100 mS. During an error corrected link break will only be transmitted to the remote modem through the active error correction protocol, giving no indication of the length. The command works together with AT\K.

\Bn Break length in 100 mS units. The value can be between 1 and 9. (Default 3)

*B – Display blacklisted phone numbers

This command requests the modem to return a list with blacklisted phone numbers to the terminal equipment when asked. The format of the response is shown by the example below.

Permanently forbidden phone numbers as defined by country requirements will not appear on this list. If no blacklisted numbers exist, the modem responds with the result code OK.

Example:

NO. – PHONE NUMBER -

1;	4175537660
2;	8288924961
3;	3887278862
4;	3124839442
5;	6284664

OK

Cn – Carrier control

This command is included for compatibility only, and has no effect other than returning a result code.

&Cn – DCD Option

The modem will handle the DCD signal depending on n. The parameter value is written to S21 bit 5. On leased lines DCD always follows the state of the carrier.

&C0	DCD remains ON at all times. (Default.)
&C1	DCD follows the state of the carrier.

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%C – Enable/disable data compression

Enables or disables data compression negotiation. The modem can only perform data compression on an error corrected link. The parameter value is written to S41 bit 0 and 1.

%C0	Disables data compression. Resets S41 bit 1 to 0.
%C1	Enables MNP 5 data connection. Resets S41 bit 1.
%C2	Enables V.42bis compression. Sets S41 bit 1.
%C3	Enables both MNP 5 and V.42 compression.
	Sets S41 bit 1. (Default)

Please also refer to AT\Nn

Dn – Dialling command

This command directs the modem to go on-line and dial according to the string entered after D.

If no dial string or any other character (according to below) is supplied, the modem will go on-line and attempt the handshake in originate mode, (dialling mode).

The command D can also be followed by other characters than numbers, these are as following:

*Sends the DTMF tone corresponding to * on a regular phone.

#Sends the DTMF tone corresponding to # on a regular phone.

A-D	Sends the DTMF tones corresponding to these.

JAttempts to connect this call with MNP 10 link negotiation. (also refer to AT*H)

KEnables power level adjustment during MNP 10 link negotiation. (also refer to ATMn)

LAn L immediately after ATD makes the modem re-dial the last number.

PThe modem selects pulse dialling. In most countries this is not available.

TThe modem selects tone dialling (DTMF). This is normally used by the modem why it is not necessary to use T when dialling a number.

S=n	The modem dials the number stored in the directory with &Z. (n = 0 to 19)

WThe modem will wait for dial tone before dialling the rest of the numbers.

,A comma gives a pause in dialling. The length is determined by the value in register S8. Note! It is neither allowed nor advisable to use comma to wait for a new dialling tone. Use W instead.

;Semicolon in the end of a dialling command returns the modem to command mode and it allows the user to issue additional ”AT” commands to the modem.

^The calling tone that otherwise is heard during a dial attempt, is not activated during this specific dial attempt.

(-)	Brackets, hyphens and spaces have no function and these can be used to format the com-
	mand line.

If ATD.. returns ERROR the ATX0 is probably set in a country that does not allow blind dialling.

Please also refer to ATA, ATX, AT&Z, S6, S7, S8, S9, S30

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