Westermo MD-54 User Manual

CTS-generator,

Xon/Xoff till CTS-omvandlare

CTS-generator,

Xon/Xoff to CTS converter

CTS-Generator,

Xon/Xoff auf CTS Wandler

INSTALLATIONSANVISNING

INSTALLATION MANUAL

INSTALLATIONS ANLEITUNG

6605-2001

www.westermo.se

MD-54 AC

MD-54 DC

©

Westermo Teleindustri AB • 1999 • REV. A

Galvanic

Isolation

Transient

Protection

Balanced

TransmissionCEApproved

136605-2001

Specifications MD-54

Transmission Asynchronous, full/half duplex or simplex Interface Channel 3: RS-232/V.24: 5-pin screw terminal

Channel 0: RS-232/V.24: 9-pin D-sub

RS-422/485: 5-pin screw terminal

Transmission rate Channel 3: 300–115 200 bit/s

Channel 0: RS-232/V.24: 1 200–115 200 bit/s

RS-422/485: 1 200–460 800 bit/s

Buffer Channel 3: 16 kb

Channel 0: 16 kb Power supply 230V AC +15%/–10% 48–62 Hz, 12–36V DC Isolation voltage 3000V AC, 1500V DC Fuse AC 100mA fast 5x20 mm, DC 1.6A LED Indicators PWR, RD0, TD0, L1, L2, L3, L4, L5, L6, L7, L8 Power consumption AC 30 mA, DC 1.5W Temperature range 5–50°C, ambient temperature Humidity 0–95% RH non-condensing Dimension 55x100x128 mm (WxHxD) Weight AC 0.5 kg, DC 0.3 kg Mounting 35 mm DIN-rail

Description MD-54

The MD-54 is a device that solves serial data incompatibility problems between two devices. For example it can be used as a ’CTS-generator’ or a ’XON/XOFF to RTS/CTSconverter’. It can also be used as a parameter and/or speed-converter and data buffer.

The unit is set up using a terminal or PC and settings are stored in non volatile memory.

The unit consists of two RS-232/V.24 interfaces and two 16 kb data buffers, one in each direction. There is also a RS-422/485 interface connected in parallel to one of the RS-232/V.24 interfaces. Both RS-232/V.24 interfaces are DCE connections.

The front cover has 11 LED’s for status indication.

As with other Westermo products the MD-54 provides a high level of galvanic isolation both on power and inputs. Operating modes are set-up via DIP-switches located under the lid on the top of the unit. The MD-54 is available in both AC (230V) and DC (12–36V) supply voltage. The unit is designed for mounting on 35 mm DIN-rail.

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Switch settings MD-54

The MD-54 can be set for a range of different operating conditions. Some settings are made via DIP-switches located under the lid on the top of the unit.

ON

12345678

ON

123456



5 4 3 2 1

1 2 3 4 5

1234 5 123 45

Warning! Do not open

connected unit

Function switch 1

Normal function

S1

ON

12345678

New program can be downloaded via channel 0 *

S1

ON

12345678

Settings can be made via channel 0 **

S1

Function switch 2

Termination 4-wire (RS-422)

S2

ON

123456

Termination 2-wire (RS-485)

S2

ON

123456

No termination

S2

ON

123456

Function switch 2

Factory settings

4-wire (RS-422)

S2

ON

12345678

S1

ON

123456

S2

ON

123456

2-wire (RS-485)

S2

*) The unit will automatically adapt its communication

parameters for channel 0. PC based software from Westermo is required to download a new program.

**) In this setting channel 0 communicates as follow:

– 9 600 bit/s – 8 bits wordlength – no parity – 1 stop bit

156605-2001

Designation Description

PWR Power supply OK RD0 RD signal channel 0 TD0 TD signal channel 0 L1 RTS signal channel 0 L2 – L3 CTS signal channel 3 L4 – L5 RD signal channel 3 L6 TD signal channel 3 L7 RTS signal channel 3 L8 –

Connections MD-54

Direction Connection CCIT V.11

no. Description

Receiver 1 A’ (R+) Receiver 2 B’ (R–) Transmitter 3 A (T+) Transmitter 4 B (T–)

5 Shield

Connection channel 0, RS-422/485 LED’s description

Direction Connection CCITT V.24

Signal description

DCE 9-pos D-sub Description

O 2 104 RD/Received Data

I 3 103 TD/Transmitted Data

– 5 102 SG/Signal Ground

I 7 105 RTS/Request To Send

O 8 106 CTS/Clear To Send

I = Input MD-54 O = Output MD-54

Connection channel 0, RS-232/V.24

Direction Connection CCITT V.24

Signal description

DCE no. Description

I 1 103 TD/Transmitted Data

O 2 104 RD/Received Data

I 3 105 RTS/Request To Send

O 4 106 CTS/Clear To Send

– 5 102 SG/Signal Ground

I = Input MD-54 O = Output MD-54

Connection channel 3, RS-232/V.24

Digital In, channel 1, 2 and 4 not used. The definations R+/R–, T+/T– can be various between different manufactures.

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Power connection MD-54 DC

2-position screw-terminal

Connection Power

supply

– – Voltage

+ + Voltage

Screw Power

supply

L 230V

N AC power

Earth

Power connection MD-54 AC

3-position screw-terminal

Line connection

Transmission range (RS-422/485)

Use twisted pair cable. Max transmission range 1200 metre. (cable specifications 0.3 mm

2

and capacitance 42pF/m). The transmission range will increase if a cable with lower capacitance and larger diameter is used. Use shielded cable in heavy industrial environments.

1) If shielded cable is used, connect the shield only at one end to avoid ground currents.

Receiver

Transmitter

Shield

MD-54

1 2 3 4

1)

5

A’

B’

A

B

Twisted pairs

RS-422 equipment

A

Transmitter

B

A’

Receiver

B’

RS-485RS-422

MD-54

Transmitter/

Receiver

Shield

3

A/A’

4

1)

B/B’

5

Twisted pairs

A/A’

B/B’

RS-485 equipment

Transmitter/ Receiver

176605-2001

How to make settings through a terminal

1. Make sure the power is off (’PWR’ LED off).

2. Connect communication-cable between CH0 (D-sub) and terminal.

3. Set switch 1:2 ON

4. Connect power cable

A menu should appear on the screen. It is now possible to make settings. After settings have been made:

5. Disconnect power

6. Set switch 1:2 OFF

Note! Remember to save settings before disconnecting power cable.



5 4 3 2 1

1 2 3 4 5

MD-54 PC 9-way PC 25-way

11 8 22 3 33 2 4420 55 7 66 6 77 4 88 5 9922

You will need a modem cable to program the MD-54

18 6605-2001

Settings

The following settings can be selected through a terminal:

Interface

RS-232/V.24 RS-485 (not selectable for channel 3) RS-422 (not selectable for channel 3)

Parity

None Odd Even

Number of stop bits

One Two

Wordlength

7 bit 8 bit

Baudrate

300 bit/s (not selectable for channel 0)

600 bit/s (not selectable for channel 0) 1 200 bit/s 2 400 bit/s 4 800 bit/s 9 600 bit/s

19 200 bit/s 38 400 bit/s

57 600 bit/s 115 200 bit/s 230 400 bit/s (not selectable for RS-232/V.24) 460 800 bit/s (not selectable for RS-232/V.24)

196605-2001

Transmit condition (not selectable for RS-422/485)

RTS Time --------------

Time CTS – data out

10 ms 50 ms 150 ms 250 ms User defined (0–250 ms)

Time CTS passive

0 ms 10 ms 50 ms 100 ms User defined (0–250 ms)

Flow control (not selectable for CTS-generator)

RTS/CTS XON/XOFF None

Note! 7 bit, no parity, 1 or 2 stopbits not selectable for channel 0.

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An example of a data flow when condition for transmission of data is an active RTS signal.

An example of a data flow when condition for data transmission is a selectable time after activating CTS.

TD channel 0

CTS channel 3

RD channel 3

TD channel 0

CTS channel 3

RTS channel 3

RD channel 3

Selected time between CTS active and data out

Selected time between data out and CTS passive

Coming from external unit A

Activated by external unit B

216605-2001

MD-54 as ’CTS-generator’

When a channel has data to send it indicates this by activating CTS. Data may not be sent until an active RTS, or a set time has elapsed since CTS was first activated. The MD-54 will buffer the incoming data until these condition are fulfilled. Both RS-232/V.24 interfaces are DCE.

XON/XOFF CTS always active

Status signalling. CTS active when channel 3 can receive data. Data transmission possible without conditions or if RTS is activated (selectable)

MD-54

(XON/XOFF to CTS)

33 22 77 88

TD RD RTS CTS

Channel 0 Channel 3

MD-54

(CTS-generator)

33 22 77 88

TD RD RTS CTS

Channel 0

Channel 3

MD-54 as ’XON/XOFF to CTS-converter’

The MD-54 is used in this mode if a system that controls its data flow with XON/XOFF is required to communicate with another system which controls data flow by means of CTS. The data flow on channel 0 is controlled using XON/XOFF. Channel 3 indicates to its connected unit that its buffer is full by deactivating CTS. Both RS-232/V.24 interfaces are DCE.

22 6605-2001

OWN COMMENTS

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

6605-2001 06.99 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)1703 702 682 E-Mail: sales@westermo.co.uk

Subsidiaries

Block diagram

Processor

RS-422/485

Channel 0 RS-232/V.24 RS-422/485 DCE

Channel 3 RS-232/V.24 DCE

TD

RD

B A

RD

RS-422

B’ A’

TD

OR

Buffer

16k

Buffer

16k

SettingsDIP

Westermo MD-54 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual