Westermo TF-300 User Manual

Interface converter

between terminal equipment

(RS-232 or RS-422/485)

and the SecureStream™ 300 network

INSTALLATION MANUAL

6606-2201

www.westermo.se

TD-300

©

Westermo Teleindustri AB • 1999 • REV. A

Galvanic Isolation

Transient

Protection

Balanced

TransmissionCEApproved

RS-232

RS-422/485

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Modem description

Introduction

TD-300 is an interface converter for connecting terminal equipment to British TelecomÕs SecureStreamª 300 network. The SecureStreamª 300 network functions as a Virtual Private Data Network using proven digital technology of British TelcomÕs UK National Telex network at a data rate of 300 bit/sec. The service offers a transparent connection between customer terminals. The SecureStreamª 300 is available anywhere in the UK.

The DTE connection on TD-300 can handle either RS-232 or RS-422/485 (one at a time). It is possible to communicate with different data rates on the DTE (300, 1200, 2 400 or 9 600 bit/sec) and the line connection (300 bit/sec) due to the fact that the interface converter includes a microprocessor and data buffers.

TD-300 supports three types of connections via the SecureStreamª 300 network:

¥ Fixed Point to Point connection ¥ Fixed Destination Call (Hot Line) ¥ Variable Destination Call

The unit can be configured to different running conditions via DIP switches.

Fixed Point To Point connection

A Fixed Point To Point connection implies that the TD-300 units establishes a permanent connection via the SecureStreamª 300 network. This also implies that one of the TD-300 units is the master unit which will establish the condition to the other TD-300 unit which is set in slave mode.

In this running mode:

¥ The interface converters initiate a call at power up. Retries will be made

until a connection is established. ¥ The connection will not be cleared unless there is a failure. ¥ One modem (the originating modem) must be configured as ÓFixed masterÓ

and the other modem (the answering modem) must be configured as ÓFixed slaveÓ. ¥ DCD is activated as long as a connection is maintained. ¥ CTS is activated as long as a connection is maintained and the buffers

are not filled up (<80% of maximum buffer). ¥ DSR is always activated.

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Fixed Destination Call (Hot Line)

A Fixed Destination Call implies that the SecureStreamª 300 network always routes all calls to a single fixed destination. The TD-300 can be configured to initiate a Fixed Destination Call either by the DTE equipment sending data or activating RTS. The TD-300 buffers all received data from the DTE equipment until a connection is established.

The call is cleared either when the RTS on the calling TD-300 is deactivated or if no data has been send or received for the last 5 seconds. Note that only the calling TD-300 may clear the call.

In this running mode:

¥ The interface converter connect / disconnect the line with active /

inactive data or RTS ¥ The modems must be configured as "Hot line" ¥ DCD is activated as long as the connection is maintained. ¥ CTS is always activated when connected with active data ¥ CTS is activated as long as the connection is maintained and the buffers

are not filled up (<80% of maximum buffer) when connected with active RTS.

¥ DSR is always activated.

Variable Destination Call (normal mode)

A variable destination call implies that the SecureStreamª 300 network routes the incomming calls to an address specified in the calling sequence. In this mode the TD-300 units emulates a subset of the Hayes standard command set to set up and maintain the connection. The basic Hayes commands are provided and also the possibility to connect to a predefined address with data or active RTS. A possibility to use answerback is also included.

In this running mode:

¥ The interface converters is controlled by Hayes commands. ¥ The modems must be configured as ÓNormalÓ. ¥ DCD and CTS are controlled by Hayes commands. ¥ No flow control, RTS/CTS flow control or XON/XOFF flowcontrol is possible. ¥ DSR is always active.

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TD-300

9

R+ R- T-T+

PWR

RD

TD

RTS

CTS

DCD

TX

876

RS-422/485 RS-232

LINE CONNECTION

LINE

POWER

V.24/RS-232-C

SG RD TD

543

CTS2RTS

1

RX N L



SecureStream™ 300

(Virtual Private Network)

RS-232 or RS-422/485

V.21V.21

RS-232 or

RS-422/485

9

876

R+ R- T-T+

RS-422/485 RS-232

TD-300

PWR

CTS

LINE

DCD

LINE CONNECTION



TX

543

SG RD TD

V.24/RS-232-C

RD

TD

RTS

RX N L

1

CTS2RTS

POWER

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TD-300 Specifications

Transmission Asynchronous, full/half duplex or simplex

DTE interface EIA RS-232-C/CCITT V.24/V.28, 9-pin D-sub female or

9-pin detachable screw block (only signals SG, RD, TD, RTS, CTS are available)

EIA RS-422/RS-485/CCITT V.11 detachable 9-pin screw block

Line interface CCITT V.21. 2-wire. 4 pin detachable screw block Transmission speed DTE interface: 300, 1200, 2400 and 9600 bit/s

Line interface: 300 bit/s Power supply 230V AC +15%/–10% 49–62 Hz, 12–36V DC Fuse AC 100mA fast 5x20 mm, DC 1,6A LED’s PWR, RD, TD, RTS, CTS, DCD Power consumption AC 2VA, DC 1,5W Temperature range 5–50°C Humidity range 0–95% RH without condensation Dimensions 55 x 100 x 128 (WxHxD) Weight AC 0.5 kg. DC 0.3 kg Mounting On 35 mm DIN-rail

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TD-300 Switch settings.

A 6 pole DIP switch provides the settings for the RS-485/422 interface. Via the 9 pole DIP switch it’s possible to select different communication parameters for the DTE connection and to configure the unit for different running modes.

2 or 4 wire RS-422/485

S3 2-wire

S3 4-wire

Number of stop bits

(DTE connection)

S4 2

ON

123456789

S4 1

ON

123456789

Number of data bits

(DTE connection)

S4 7

ON

123456789

S4 8

ON

123456789

Parity

(DTE connection)

S4 No parity

ON

123456789

S4 Odd parity

ON

123456789

S4 Even parity

ON

123456789

S4 No parity

ON

123456789

ON

123456

ON

123456

Termination

RS-485/422

S3

Termination 2-wire (RS-485)

S3

Termination 4-wire (RS-422)

ON

123456

ON

123456

S3

No termination

ON

123456

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Data rate

(DTE)

S4 300 bit/s

ON

123456789

S4 1200 bit/s

ON

123456789

S4 2400 bit/s

ON

123456789

S4 9600 bit/s

ON

123456789

Running condition

via SecureStream™ 300

Factory settings

S4

Fixed master

ON

123456789

S4

Fixed slave

ON

123456789

S4

Hot line

ON

123456789

S4

Normal

ON

123456789

Running condition

via DTE in normal mode

S4

Quiet mode

ON

123456789

S4

Normal mode

ON

123456789

S4

ON

123456789

ON

123456

S3

Quiet mode implies that no result codes or echo is sent to DTE, this is often used in a PLC connection. Normal mode implies that the result codes and echo to DTE is controlled by commands.

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TD-300

9

R+ R- T-T+

PWR

RD

TD

RTS

CTS

DCD

TX

876

RS-422/485 RS-232

LINE CONNECTION

LINE

POWER

S3:1–6

V.24/RS-232-C

SG RD TD

543

CTS2RTS

1

RX N L



123456789

S4:1–9

Connections TD-300

RS-422/485 connection

(9-pole screw terminal)

Line connection

(4-pole screw terminal)

Direction

No.

Description

Receiver 9 A’ (R+) Receiver 8 B’ (R–) Transmitter 7* A (T+) Transmitter 6* B (T–)

5 Shield

Direction

Pin no.

line

Description

Not used 3 R

Not used 4 R Receiver/Transmitter 1 T Receiver/Transmitter 2 T

*) Two wire connection

The definations R+/R–, T+/T– can be various between different manufactures.

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O 1 109 DCD/Data Carrier Detect O 2 4 104 RD/Received Data

I 3 3 103 TD/Transmitted Data

NC 4

– 5 5 102 SG/Signal Ground

O 6 107 DSR/Data Set Ready

I 7 1 105 RTS/Request to Send

O 8 2 106 CTS/Clear to Send

NC 9

Signal description

Terminal connection (DTE)

(RS-232-C/V.24, 9-pole D-sub, female alt. 9-pole screw terminal)

Direction

Pin no.

Screw-

terminal

CCITT V.24

Description

N 115V*/230V

L AC power

PE/Protective Earth

Power connection (AC)

(3-pole screw terminal)

*) TD-300 115V

No.

Power supply

1 – Voltage

2 + Voltage

Connection

no.

Power supply

Switch settings

According to TD-300 AC

Connections

According to TD-300 AC, except power supply

TD-300 DC

I = input O = output NC = not connected

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DTE Command lines

A command line is a string of characters send from a DTE to the modem (DCE) while the modem is in a command state. A command line has a prefix, a body, and a terminator. Each command line must begin with the character sequence AT and must be terminated by a carriage return. Commands entered in upper case or lower case are accepted, but both the A and T must be of the same case, i.e., ÓATÓ (ASCII 065, 084) or ÓatÓ = (ASCII 097, 116).

The body is a string of commands restricted to printable ASCII characters (032-126). Space characters (ASCII 032) and control characters other than CR (ASCII 013) and BS (ASCII 008) in the command string are ignored. The default terminator is the CR (ASCII

013) character. Characters that precede the AT prefix are ignored. The command line interpretation begins upon receipt of the carriage return character.

Characters within the command line are parsed as commands with associated parameter values. The basic commands consist of single ASCII characters, or single characters preceded by a prefix character (e.g., Ô&Õ or Ô%Õ), followed by a decimal parameter.

The modem supports the editing of command lines by recognizing a backspace or delay character. When modem echo is enabled, the modem responds to receipt of a backspace or delete by echoing a backspace character, a space character, and another backspace. A command line may be aborted at anytime by entering < ctrl-x > (ASCII 024).

The AT sequence may be followed by any number of commands in sequence, except for commands such as Z, D, O or H. Commands following Z, D, O or H on the same command line will be ignored. The maximum number of characters on any command line is 39 (including 'A' and 'T'). If a syntax error is found anywhere in a command line command, the remainder of the line will be ignored and the ERROR result code will be returned to the DTE.

Commands entered with parameters out of range will not be accepted and the ERROR result code will be returned to the DTE. Commands will only be accepted by the modem once the previous command has been fully executed, which is normally indicated by the return of an appropriate result code. Execution of command D will be aborted if another characters is received from DTE before completion of the handshake.

When the modem has established a connection and has entered on-line data mode, it is possible to break into the data transmission in order to issue further commands to the modem in an on-line command mode. This is achieved by the DTE sending to the modem a sequence of three ASCII characters specified by register S2. The default character is '+'. The timing of the three characters must comply with specific time constraints. There is a guard time before the first character and a guard time following the third character and also between each character. This guard-time is set to one second in all cases. If other characters are received within the guard time the escape sequence is not recognized.

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AT command set

The modem will respond to the commands detailed below. Parameters applicable to each command are listed with the command description.

&Bn Ð RTS Dial Option

This command stores the current profile and enables or disables the dialing with active

RTS from DTE. The modem will dial the address stored with AT&Z0=.....

&B0 Disable dial with active RTS signal. &B1 Enable dial with active RTS signal.

Observe that this will take the modem to RTS-mode and an active RTS from DTE will be interpreted as a dial command. There are three possibilities to leave RTS-mode. Number one is to use the (&B0) command with RTS inactivated. Number two is to use the escape sequence when the modem is connected and then disable the dial with RTS (&B0). Another possibility is to remove the D-sub or the RS-232 screw block (inactivate RTS) and repower the modem and then use switch S4:8 which works as a reset switch and will disable the dial with active RTS-signal (&B0). The modem will be reset on a ON to OFF to ON sequence on switch S4:8. Switch S4:8 can only be used when the modem is disconnected from the line.

&Cn Ð DCD Option

This command controls the DCD signal.

&C0 DCD active at all times. &C1 DCD active when a connection is established (default).

Dn Ð Dial Option

This command directs the modem to establish a connection. If no dial string is supplied the modem will established a Hot Line call (if available).

The valid dial string parameters are described below.

0-9 digits 0-9

En Ð Command Echo

This command enables or disables the echo of characters to the DTE.

E0 Disables command echo. E1 Enable command echo (default).

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&En Ð Data Dial Options

This command stores the current profile and enables or disables the dialling with data

from DTE. The modem will dial the address stored with AT&Z0=....

&E0 Disable dial with data. &E1 Enable dial with data.

Observe that this will take the modem to data-mode and all incoming characters from DTE will be interpreted as a dial command. There are two possibilities to leave data mode. Number one is to use the escape sequence when the modem is connected and then disable the dial with data (&E0). Another possibility is to use switch S4:8 which works as a reset switch and will disable the dial with data (&E0). The modem will be reset on a ON to OFF to ON sequence on switch S4:8. Switch S4:8 can only be used when the modem is disconnected from the line.

&F Ð Recall (restore) factory configuration

This command restores the original factory setting of all parameters and S-registers. When the modem is restarted the parameter set by the customer will be restored. By using the &W command the factory setting will be valid also after restart of the modem.

H Ð Disconnect (hang up)

This command initiates a hang up sequence.

&Kn Ð Flow control

This command defines the DTE/DCE (terminal/modem) flow control mechanism.

&K0 Disables flow control (default). &K3 RTS/CTS flow control. &K4 XON/XOFF flow control (with characters specified in S-register 32 and 33).

O Ð Return to On-Line Data Mode

This command returns the modem to data mode when the modem has entered the on-line command mode. Observe that this command is only possible when a connection is established and the escape sequence has been entered.

Qn Ð Result Codes Control

This command enables or disables the result codes to the DTE.

Q0 Enables result codes to DTE (default). Q1 Disables result codes to DTE.

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Sn=x Ð Write to S-register

This command write a value x to specified S-register n. See S-register section for specification of S-registers. Observe that a value x out of range will generate an error.

%Sn Ð Answerback

This command enables or disables the answerback function. Also observe the stored/expected answerback strings with &Zn command.

%S0 Disable answerback (default). %S2 Enable answerback.

Vn Ð Result Code Form

This command selects the short or long-form for the resultcodes.

V0 Enables short-form (terse) result codes. Line feed is not issued before a short-

form result code.

V1 Enables long-form (verbose) result codes (default).

&V Ð Display Current Configuration and Stored Profile

The modem reports the current and the stored profile, the stored number for data / RTS connection and stored / expected answerback.

Example:

ACTIVE PROFILE: E1 Q0 V1 X1 &B0 &C1 &E0 &K0 %S0 S02:043 S03:013 S04:010 S30:100 S32:017 S33:019 S98:010 S99:000

STORED PROFILE: E1 Q0 V1 X1 &B0 &C0 &E0 &K3 %S0 S02:043 S03:013 S04:010 S30:100 S32:049 S33:048 S98:050 S99:100

STORED NUMBER FOR DATA/RTS CONTROL: 123456

STORED ANSWERBACK: WESTERMO

EXPECTED ANSWERBACK: WESTERMO

&W Ð Store Current Configuration

This command saves the current (active) configuration (profile), including S-registers. The stored setting is restored by using the Z command.

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Xn Ð Result Codes Response Set:

This command selects which subset of the result messages that will be used by the modem to inform the DTE of the results of the commands.

X0 Basic response set. Send only result codes OK, CONNECT, RING,

NO CARRIER, ERROR and NO ANSWER to DTE.

X1 Extended response set. Send result codes as above and also NO DIALTONE,

BUSY and NO ANSWER to DTE (default).

Z Ð Soft reset and Restore Profile

This command performs a soft reset and restores the stored profile.

&Zn=x Ð Store numbers and answerback

This command stores a string x which specifies the address for dialing with data/RTS, the expected answerback or the stored answerback.

&Z0=... Number for dialling with data/RTS

&Z1=... Store answerback string in modem. This string will be sent when answerback

is active. Observe that only ASCII characters 33 up to 126 are possible to use in the string.

&Z2=... Expected answerback string. This string will be searched for in a connection

when answerback mode is active. Observe that only ASCII characters 33 up to 126 are possible to use in the string.

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Result codes

When a command is sent from the DTE the modem replies with a result code. The result code may be either in Long Form i.e. text (V1) or in Short Form i.e. a digit code (V0). The result code in Long Form is followed by <CR><LF> and in Short Form by <CR>. The result codes are enabled by using the Q1 command.

The possible result codes are as follows:

With basic response set (X0)

0 OK Command accepted and executed. 1 CONNECT A call has entered the connect phase. 2 RING Incoming call detected. 3 NO CARRIER Ended call (correct or incorrect) or no carrier. 4 ERROR Illegal command / command not possible

With extended response set (X1) as above and:

6 NO DIALTONE No carrier or error code DER from network 7 BUSY Error codes NC or OCC from network 8 NO ANSWER Error codes NA, NP, NCH or ABS from network

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S-registers

The section belows describes the available S-registers. The S-registers are set by using the Sn=x command. The registers are stored by using the &W command.

S2 Ð Escape character

S2 holds the decimal value of the ASCII character used as the escape character. The default value corresponds to Õ+Õ(ASCII 043). Possible values are 0-255 and a value over 127 will disable the escape process.

S3 Ð Carriage Return Character

S3 hold the decimal value of the ASCII character used as command line and result code terminator. The default value corresponds to <CR> (ASCII 013). Possible values are 0-127.

S4 Ð Line Feed Character

S4 hold the decimal value of the ASCII character used as line feed. The default value corresponds to <LF> (ASCII 010). Possible values are 0-127.

S30 Ð Disconnect Inactivity Timer

S30 holds the value of the length of time in tenths of seconds that the modem will stay on-line before disconnecting when no data is sent or received. Observe that this command is only valid when &E1 command (datamode). The default value is 0 (disabled) and possible values are 0-255 (0-25,5 seconds). The default value 0 implies that the modem will not disconnect the line with the inactivity timer.

S32 Ð XON Character

S32 holds the decimal value of the ASCII character used as XON character. The default value corresponds to <DC1> (ASCII 017). Possible values are 0-255.

S33 Ð XOFF Character

S33 holds the decimal value of the ASCII character used as XOFF character. The default value corresponds to <DC3> (ASCII 019). Possible values are 0-255.

S98 Ð Packet size

S98 holds the packet size value. Using this register will make it possible to package incoming signs from V.21 side and send on DTE side when the packed size parameter is reached. The default value correspond to 0 which will disable the register. Possible values are 0Ð255 which corresponds to a packet size between 0Ð255 signs. See also register S99.

S99 Ð Delay timer

S99 holds the delay timer value. Using this register with register S98 will make it possible to send signs even if the packet size value is not reached. If no signs are received on the V.21 side within the specified delay timer value the signs that are buffered will be sent on the DTE side. The default value corresponds to 0 wich will disable the register. Possible values are 0Ð255 which corresponds to a timer value between 0Ð255 ms. See also register S98.

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Examples

Example 1 Ð AT commands

Several commands can be stacked on each command-line. For example

ATE0Q1X0D1235

can be used instead of

ATE0 OK ATQ1 OK ATX0 OK ATD1235

Example 2 Ð Frequently used settings for PLC-systems

Most PLC-systems and other industrial applications require the same changes to the standard settings.

The most commonly encountered problems concern speed, format and control signals from the connected equipment.

Speed and format are changed with the switches under the cover in block SW4. SW4:9 can be used to set the modem in quiet mode which will disable echoing and result codes to the DTE. Other problems might concern control signals to the connected equipment. Below follows a list of commands that might resolve the problems. For further information regarding these commands please refer to the specific section of this manual.

AT&C1 Control DCD signal. AT&K0 Flow control modem/terminal

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Example 3 Ð Dial up with data from DTE

Dial-up can be made by sending data from DTE. A typical application might be an unintelligent equipment at the DTE side, e.g. an alarm.

The modem must be set up with the address to dial with

ATZ0=..... (up to 20 digits).

The inactivity timer must be assigned to allow the modem to disconnect after a predefined period with no data in either direction.

ATS30=..... (0-255 equals 0-25,5 seconds)

The modem must be set up with the AT&E1 command allowing the modem to use datamode. This will also store the current profile and on the next incoming data from the DTE side the modem will connect to the predefined address. The modem is equipped with a redial function which will make further connection attempts if the first connection fails.

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OWN COMMENTS

.....................................................................................................................................................................................................................

6606-2201 10.99 Mälartryck AB, Eskilstuna, Sweden

Westermo Teleindustri AB • S-640 40 Stora Sundby, Sweden

Phone +46 16 612 00 Fax +46 16 611 80

E-mail: info@westermo.se • Westermo Web site: www.westermo.se

Westermo Teleindustri AB have distributors in several countries,

contact us for further information.

Westermo Data Communications GmbH Bruchsaler Straße 18, 68753 Waghäusel Tel.: +49(0)7254-95400-0 • Fax.:+49(0)7254-95400-9 E-Mail: westermo.germany@t-online.de

Westermo Data Communications Ltd Solent Business Centre • Millbrook Road West Millbrook, Southampton • SO15 0HW Phone: +44(0)2380 704 611 • Fax.:+44(0)2380 702 682 E-Mail: sales@westermo.co.uk

Subsidiaries

Block diagram

Data

buffer

OR

Settings

0V

DSR RTS CTS DCD RD TD RD TD

Data

buffer

FSK

modulation

Data rate conversion (if needed)

FSK

demodulation

Analogue filtering

FSK modulated data (V21) for connection

to the “Secure Stream™ 30” network

Line interface

DTE interface

RS-232 RS-422/485

Modem

chip

Processor,

UART and

memory

Westermo TF-300 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual