DAST20 datasheet(2/22 Pages) MSYSTEM

2 / 22 page

MODEL: DAST-20

DAST-20 SPECIFICATIONS

ES-5921 Rev.8 Page 2/22

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

Material

Chassis: black chromate-plated steel

Housing: flame-resistant resin (black)

Isolation: telephone circuit to I/O to power

Self-diagnosis

CPU: watch-dog timer

Memory: sum check

Power voltage: detects when the voltage supply to the CPU

drops by 10 %.

■ RUN CONTACT OUTPUT

RUN contact output: contact opens when the self-diagnosis

detects an abnormality or with a transmission error.

Rating: 120V AC or 30V DC @1A (resistive load)

MODEM & LIGHTNING ARRESTER

■ 50 BPS TYPE

•Modem (model: MOD1-K)

Telephone circuit: NTT leased circuit, 50 bps

Sending voltage: ±50 V max.

Sending current: ±20 mA ±3 mA

Transmission method: earth-return

Transmission rate: 50 bps

No. of circuits: 1

Approval No.: L02-0066

•Lightning Arrester (model: MDP-MFA)

Discharge voltage

Between B – C: ±110 V min.

Between B or C – A: ±55 V min.

Between each line – G: ±500 V max.

Maximum surge voltage

Between 2 – 3: ±320 V max.

Between 2 or 3 – 1: ±160 V max.

Between each line – G: ±650 V max.

Response time: ≤0.1 μsec.

Discharge current capacity: 5000 A (8 / 20 msec.)

Maximum load current: 100 mA

Internal series resistance: approx. 20 Ω including return

Leakage current

Between B – C: ≤50 mA at ±110 V DC

Between B or C – A: ≤50 mA at ±55 V DC

Between each line – G: ≤10 mA at ±140 V DC

■ 300 BPS TYPE

•Modem (model: MOD2-K)

Telephone circuit: NTT leased circuit, 3.4 kHz

Sending level: -7 to -15 dBm

Receiving level: -40 dBm

Transmission rate: 300 bps (half-duplex)

Modulation: conform to ITU-T V.21

No. of circuits: 1

Approval No.: D01-0730JP

•Lightning Arrester (model: MDP-FT)

Discharge voltage

Between lines: ±1.2 V min.

Line to ground: ±500 V max.

Maximum surge voltage

Between lines: ±15 V max.

Line to ground: ±650 V max.

Response time: ≤0.1 μsec.

Discharge current capacity: 5000 A (8 / 20 msec.)

Maximum load current: 100mA

Internal series resistance: approx. 8 Ω including return

Leakage current

Between lines: ≤20 mA at ±1.2 V

Line to ground: ≤10 mA at ±140 V

Maximum line voltage: 1.2 V

INSTALLATION

Power consumption

•AC: Approx. 5 VA max.

Grounding: ≤100 Ω required for 50 bps type

Operating temperature: -5 to + 50°C (23 to 122°F)

Operating humidity: 30 to 90 %RH (non-condensing)

Atmosphere: No corrosive gas or heavy dust

Mounting: Surface

Weight: 1.5 kg (3.3 lb)

PERFORMANCE

Permissible power failure duration: ≤ 20 ms

Insulation resistance: ≥ 100 MΩ with 500 V DC

Dielectric strength: 1500 V AC @1 minute

(telephone circuit to I/O to power)

1500 V AC @1 minute (circuit to ground)

TRANSMISSION TIME

■ Simple Transmission Time

The simple transmission time means the time between the

start of data sending from the master station and the end of

data sending from the local station. It means 1 cycle of data

transmission between the master station

and the local station. It does not mean the time required for

an input signal to be output.

■ How to Calculate the Simple Transmission Time

•Transmission Rate 50 bps

Simple Transmission Time (sec.)

= (No. of data bytes from master station + No. of data

bytes from local station) × 0.22 + 0.5 × 2

•Transmission Rate 300 bps

Simple Transmission Time (sec.)

= (No. of data bytes from master station + No. of

data bytes from local station) × 0.037 + 0.2 × 2

■ Effective Transmission Time

The effective transmission time means the time required for

a change of an input signal to affect its output signal. It

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