Westermo MA-12 User Manual

Korthållsmodem

Short haul modem

Kurzstreckenmodem

INSTALLATIONSANVISNING

INSTALLATION MANUAL

INSTALLATIONS ANLEITUNG

6012-2001

www.westermo.se

MA-12 AC

MA-12 DC

©

Westermo Teleindustri AB • 1999 • REV. A

Galavanic

Isolation

CE

Approved

Balanced

Transmission

Transient

Protection

8 6012-2001

Specifications MA-12

Transmission Asynchronous, full/half duplex or simplex
Interface 1 EIA RS-232-C/CCITT V.24/V.28

25-position D-sub female, DCE

Interface 2 ±10mA balanced current loop
Data rate Up to 38 400 bit/s
Indicators Power, RD, DCD, RTS, TD
Isolation Galvanic insulation with opto-coupler (data transmission)

and transformer (supply)

Insulation voltage 1500V
Overvoltage protection Nät: Breakdown voltage 440V at 230V AC and

220V at 115V AC
Interface 2: Breakdown voltage
transmitter 15V and receiver 5.8V
Surge capacity 0.6 kW for 1 ms

Power supply Switchable 115/230V +15/–10% 48–62Hz
Fuse 100 mA fast 5x20 mm
Power consumption Max 4VA at 230V
Temperature range 5–50°C, ambient temperature
Humidity 0–95% RH, non-condensing
Dimensions 161x139x53 mm
Weight 0.5 kg
Mounting With rubber pads or screws.

Screws: Remove the two ’’keyholes’’ on the bottom
of the case

96012-2001

Danger! Do not open connected unit

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LINE

CONNECTION

V.24/RS-232-C

CONNECTION

Switch settings

Transmitter (carrier) activated by

ON

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S1

Always active

ON

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S1

AUX

ON

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S1

SRS

ON

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S1

RFR

ON

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S1

RTS

ON

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S1

DTR

ON

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S1

DTR and AUX

ON

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S1

DTR and SRS

ON

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S1

DTR and RFR

ON

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S1

DTR and RTS

CTS controlled by

ON

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S1

RTS

ON

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S1

Always high

ON

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S1

DCD

ON

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S1

Factory settings

ON

1 2 3 4 5 6 7 8 9

S2

S1

ON
OFF

S1 Selection of signal activating transmitter (carrier)

Selection of signal controlling CTS

S2 Selection of power supply 115/230V AC

Switch settings MA-12

The MA-12 can through different switch settings be adapted to a variety of running con­ditions. To set the switches, open the plastic case by placing and turning a screw-driver
between top and bottom at the rear of the case.

10 6012-2001

Connections

Line connections

(5-pos. screw-terminal)

Direction No. Description
Receiver 1 R+
Receiver 2 R–
Transmitter 3 T+
Transmitter 4 T–

5 Shield

Terminal connection (DCE)

(RS-232-C/V.24/V.28, 25-position D-sub, female)

Direction 1) Pin CCITT V.24 Description

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 11 – AUX / Auxiliary

I 19 120 SRS / Secondary Request to Send

I 20 108/2 DTR / Data Terminal Ready

I 25 133 RFR / Ready For Receiving

1) I = Input O = Output on MA-12

Anslutning

According to MA-12AC, exept power supply

Connection no. Power supply

1 + Voltage
2 – Voltage
3

116012-2001

MA-12 DC

Specifications

Switch settings

According to MA-12AC

Power supply 12-36V DC
Power consumption Max 3W
Insulation 1000V
Fuse F1 1,6A fast 5x20 mm

All other specifications according to MA-12 AC

123

POWER

12–36V DC

LINE

CONNECTION

V.24/RS-232-C

CONNECTION

Transmission range (interface 2)

Cable Transmission rate bit/s
42pF/m 600 1200 2400 4800 9600 19200 38400
0,3mm

2

18000 m 12000 m 8000 m 5000 m 2500 m 1000 m 500 m

Line connection

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

MA-12

Receiver

1

2

3
4

5

T+

T–

R+

R–

Transmitter

Shield 1)

Tvinnade trådpar

Ex MA-12, MA-19....

Transmitter

R+

R–

T+
T–

Receiver

3

4

1
2

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12 6012-2001

Hints

MA-12 are compatible with all asyncronous Westermo modem.
The RS-232 interface on the MA-12 is configured as DCE (Data Communication Equip-

ment). Most printers, PC’s and terminals are set as DTE (Data Terminal Equipment).
Some recommendation of cable configurations are given below.

If any problems do occur on set up of the MA-12, the LED’s will be helpful.

• PWR: The unit has power.

• RD: Data received on line interface.

• TD: Data received on RS-232 interface.

• DCD: Carrier indication, must be on for transmission.

• RTS: Indicates the carrier control status.
A good way to check the MA-12 is to carry out a loop back test. Connect

T+ to R+ and T– to R–. Connect the RS-232 port to a terminal. When
keys are pressed on the terminal you should receive the echo on screen.
The TD & RD lights will both flicker simultaneously as you press the keys.

DTE MA-12 DCE MA-12 9-pos. PC MA-12

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136012-2001

OWN COMMENTS

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Block digram

V.24/V.28/RS-232

DTR

AUX

SRS

RFR

RTS

CTS

DCD

RD

TD

5

4

3

2

1

DSR

SG

PG

Power supply

1) 0 Ω resistor J2 is normally not mounted 2) Metal housing on D-sub is connected to 0V

Insulated power supply

Line

R+

R–

T+
T–

PWR

Shield

PE

J1

1

7

6

2

3

8

5

4

25

19

11

20

+12V

X3 S1

1
2

3
4
5

6

7

8
9

RD DCD

TD

+12V

0V

2)

1) J2

+12V

+12V

RTS

F1

+12V
0V

–12V

OV

6012-2001 10.00 TunaTryck AB, Eskilstuna, Sweden

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

Phone [phone] Fax [phone]

E-mail: [e-mail] • 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.: [phone] • Fax.:[phone]
E-Mail: [e-mail]

Westermo Data Communications Ltd
Unit 14 Talisman Business Centre • Duncan Road
Park Gate, Southampton • SO31 7GA
Phone: [phone] • Fax.:[phone]
E-Mail: [e-mail] • Web: www.westermo.co.uk

Subsidiaries

&

Volt

sel

115/

230V