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
2 6606-2201
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.
36606-2201
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.
4 6606-2201
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
56606-2201
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
6 6606-2201
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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