Westermo MA-49 User Manual

Omvandlare RS-232 – RS-422/485

Converter RS-232 – RS-422/485

Wandler RS-232 – RS-422/485

INSTALLATIONSANVISNING

INSTALLATION MANUAL

INSTALLATIONS ANLEITUNG

6049-2001

www.westermo.se

MA-49

©

Westermo Teleindustri AB • 1999 • REV. A

Galvanic

Isolation

Transient

Protection

Balanced

Transmission

CE

Approved

8 6049-2001

Specifications

Transmission Asynchronous, full/half duplex or simplex Interface 1 EIA RS-232-C/RS-423-A

ITU-T V.24/V.10 25-position D-sub female, DCE

Interface 2 EIA RS-422/RS-485/ITU-T V.11 Data rate Up to 100 kbit/s Indicators RTS, CTS, DCD, RD, TD

+12 V, –12 V

Isolation Galvanic insulation with opto-coupler (data transmission)

and transformer (supply)

Isolation voltage 1 500 V Overvoltage protection Breakdown voltage transmitter and receiver 7 V.

Surge capacity 0.6 kW for 1ms.

Power supply External through PS-02 mounted in rack RV-01.

±20 V DC ±20%

Fuse 2x100 mA fast 5x20 mm Power consumption +20 V 70 mA, –20 V 80 mA Temperature range 5–50°C, ambient temperature Humidity 0–95% RH, non-condensing Dimensions 100x100 mm Weight 0.1 kg Mounting To be mounted in rack RV-01, takes one card slot.

NOTE! Max 9 MA-49 with one power supply (PS-02) in rack RV-01.

96049-2001

Selection of signal

activating

CTS

delay

Switch settings

The MA-49 can through different switch settings be adapted to a variety of running conditions.

S2 Selection of signal activating

the transmitter Selection of signal controlling DCD Selection of CTS delay

S3 Selection of termination with

fail-safe 1) Selection of 2- or 4-wire communication

S2 RTS RTS RTS

Transmitter activated by

CTS

controlled

by

DCD

controlled

by

ON

123456

S2 RTS RTS

Always

high

ON

123456

S2 DTR DTR DTR

ON

123456

S2 DTR DTR

Always

high

ON

123456

S2

Always

active

Always

high

Always

high

ON

123456

S2

Always

active

Always

high

Always

high

ON

123456

S2 0ms

ON

123456

S2 20ms

ON

123456

Factory settings

S2

ON

123456

S3

ON

123456

Termination

with fail-safe 1)

S3

Receiver termination (4-wire)

ON

123456

S3

Transmitter/Receiver termination (2-wire)

ON

123456

S3 No termination

ON

123456

Selection of 2-/4-wire

S3 4-wire

ON

123456

S3 2-wire

ON

123456

1) The fail-safe function forces the signal state of the receiver to OFF when the connected transmitter is in tri-state (transmitter inactive). The receiver located furthest away shall be terminated.

S2

1 – 6

S3

ON

1 – 6

OFF

ON OFF

10 6049-2001

Connections

Line connection

(5-position screw-terminal)

Direction Pin ITU-T V.24 Signal name

no. Circuit number

I 2 103 TD/Transmitted Data

O 3 104 RD/Received Data

I 4 105 RTS/Request To Send O 5 106 CTS/Clear To Send O 6 107 DSR/Data Set Ready

– 7 102 SG/Signal Ground

O 8 109 DCD/Data Carrier Detect

I 20 108/2 DTR/Data Terminal Ready

I = Input, O = Output MA-49

Terminal connection (DCE)

(RS-232-C/V.24, 25-Position D-sub, female)

Look right for a section of rack RV-01 with one MA-49 mounted. Terminal connection to a 25-position D-sub (female) connector on MA-49. Line connection to a 5-position detachable screw-terminal, which is mounted on the male connector located at the rear of RV-01.

Direction Pin CCIT V.11

no. Description

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

Shield

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

1

14

12345

13

25

1 2 3 4 5

116049-2001

Transmission range (interface 2)

Use twisted pair cable. Max transmission range 1 200 m. (cable specifications 0.3 mm

2

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

Line connection

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

Receiver

Transmitter

Shield

MA-49

1 2 3 4

1)

5

RS-422

Twisted pairs A’ B’ A B

equipment

A

Transmitter

B A’

Receiver

B’

2-wire4-wire

Transmitter/

Receiver

Shield

MA-49

1)

3

A/A’

4

B/B’

5

Twisted pairs

A/A’ B/B’

RS-485 equipment

Transmitter/ Receiver

12 6049-2001

Hints

The MA-49 uses the RS-422/485 interface. RS-422/485 was designed for multidrop applications. When a system is installed it should form a bus structure (see diagrams). Star shaped networks should never be created, there are other Westermo products designed to work in star net applications. To correctly install, an RS-422/485 network should be terminated at the correct points.

The recommendation is to terminate the receivers at both end of network. See diagrams for details of how this is done with RS-485 (2 wire) and RS-422 (4 wire).

On 4 wire systems when the MA-49 is on a slave system, it’s transmitter is linked to the same bus as all the other slave transmitters. A status signal (RTS or DTR) is used to control the MA-49’s transmitter, to ensure only one slave is active on the bus at one time. The status signal is also used to control direction for RS-485 (2 wire) transmission.

If any problems do occur on set up of the MA-49, the LED’s will be helpful.

• RTS:Indicates that the RS-422/485 transmitter is activated.

• CTS: Follows RTS.

• DCD:Simulated carrier due to the setting of S2.

• RD:Data received on the RS-422/485 interface.

• TD:Data received on the RS-232 interface.

• +12V, –12V:Indicates positive and negative power supply respectivly.

=Termination

Max 32 connections

Max 1 200 metres

Max 0.3 metre

=Termination

Max 32 connections

A B

ABABAB

A’ B’ A B

B’ A’ A’BBAB’A’BAAB’

N.B. R+/R–, T+/T– definitations are not standard, it can help to shift A and B

if the unit not will work.

136049-2001

OWN COMMENTS

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

SG

Power supply

1) 0 Ω resistors R52 is normally not mounted.

A' B'

A

B

Shield

V.11/RS-422 RS-485

V.24/RS-232

TD

RTS

DTR

DCD

CTS

RD

DSR

2)

7

0V

1 2

3

4

PWR

TD

+5V

DCD

+5V

2

4 20

8

1 2

3

4

5

RTS

20mS

CTS

RD

5

3

+5V

S3

+5VB

6

1K

100R

1K

S2

6

0VB

5

F2

0VB

+5VB

0VB

+12V

S2

6

4

S3

3

5

S3

1

2

-12V

+5V

2)

F1

0V

0VB

R52 1)

6049-2001 01.11 Mälartryck AB, Eskilstuna, Sweden

Block diagram

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

Phone +46 16 42 80 00 Fax +46 16 42 80 01

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 Ltd Unit 14 Talisman Business Centre • Duncan Road Park Gate, Southampton • SO31 7GA Phone: +44(0)1489 580 585 • Fax.:+44(0)1489 580586 E-Mail: sales@westermo.co.uk • Web: www.westermo.co.uk

Westermo Data Communications GmbH Goethestraße 67, 68753 Waghäusel Tel.: +49(0)7254-95400-0 • Fax.:+49(0)7254-95400-9 E-Mail: info@westermo.de • Web: www.westermo.de

Westermo Data Communications S.A.R.L. 9 Chemin de Chilly 91160 CHAMPLAN Tél : +33 1 69 10 21 00 • Fax : +33 1 69 10 21 01 E-mail : infos@westermo.fr • Site WEB: www.westermo.fr

Subsidiaries

Westermo MA-49 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual