MODEL: DAST-20

DAST-20 SPECIFICATIONS

ES-5921 Rev.8 Page 4/22

http://www.m-system.co.jp/

No. DESCRIPTION

EXPLANATION

1

RUN LED

Red LED ON at normal status;

OFF at anomaly detected by selfdiagnosis;

blinks when there is anomaly in telephone

circuit.

2

Contact I/O

Monitor LEDs

Red LED ON with contact ON;

provided only for contact I/O types

3

RUN Contact

Output Terminals

Relay opens when an anomaly is detected.

4

Power Indicator

LED

Red LED ON at normal status;

OFF when the voltage level drops.

5

Master/Local SW

Designating the Master and Local Stations

(factory set)

6

Circuit Status

Indicator LEDs

Red LED; turn ON according to the status

of telephone circuit

7

Power Terminals

Refer to the Terminal Connection.

8

Modem Circuit

Terminals

Connected with the lightning arrester.

(factory connected)

9

Circuit Connection

Terminals

Refer to the Terminal Connection.

10

Grounding Terminal Refer to the Terminal Connection.

11

Modem Circuit

Connector

Not used.

I/O Module

Modem

Lightning Arrester

3

4

5

6

2

1

8

RD

SD

FG

U

LINE

POWER

V

7

12

5

6

14

11

1

10

15

4

3

2

7

9

8

1

2

4

S

S

P

P

1

3

11

8

7

9

10

2

6

5

■ 300 bps TYPE (Transmission Rate Code: 2)

CONNECTION DIAGRAM

FG

RD

SD

U

V

POWER

RUN CONTACT

TELEPHONE

CIRCUIT

1

2

A

B

3

C

SG

7

RD

8

SD

7

14

1

2

G

100 ohms max.

LIGHTNING

ARRESTER

MODEM

I/O MODULE

Refer to later pages

for connection of

each I/O type.

■ 50 bps TYPE (Transmission Rate Code: 1)

L1

L2

U

V

POWER

RUN CONTACT

TELEPHONE

CIRCUIT

P

S

P

LINE 1

LINE 2

S

7

8

7

14

1

2

G

8

8

LIGHTNING

ARRESTER

MODEM

I/O MODULE

Refer to later pages

for connection of

each I/O type.

■ 300 bps TYPE (Transmission Rate Code: 2)

Remark 1 : Broken line connections are already done at factory. Do not remove those cables already wired

when wiring to power supply (Terminals 7 – 8 of the Modem) and ground terminals (G).

Remark 2 : Be sure to ground (100 ohms or less) for 50 bps type which emploies the earth-return method.