ES-5921 Rev.10
DAST-20
Telemetering System
TELEMETERING SYSTEM
Functions & Features
• Small-scale telemetering system
• Lightning arrester protecting telephone circuit standard
• Approved of Technical Requirements Compliance Approval by Japan Approvals Institute for Telecommunications Equipment
• Isolation between telephone circuit, I/O and power
• Easy-to-handle plugin construction for each component: Communication Module, Modem Module, Lightning Arrester
• Self-diagnosis
• Monitor LED provided for contact I/O modules
MODEL: DAST-20-[1][2]-K
ORDERING INFORMATION
• Code number: DAST-20–[1][2]–K
Specify a code from below for each of [1] and [2].
(e.g. DAST-20-1MC81-K)
[1] TRANSMISSION RATE
1
: 50 bps
2
: 300 bps
[2] I/O SECTION
Master Station
MC81
: Contact outputs, 4 open collector outputs
ME5
: Contact I/O, 4 dry contact inputs
4 open collector outputs
MM4
; Analog outputs, 4 voltage outputs
MR3
: Analog I/O, 4 voltage inputs
4 voltage outputs
MS6
; Contact & analog outputs
4 open collector outputs
4 voltage outputs
MS8
; Contact inputs & analog outputs
4 dry contact inputs
4 voltage outputs
MU4
: Analog & pulse outputs
4 voltage outputs
4 pulse outputs (open collector)
MS4
: Contact, analog & pulse outputs
2 open collector outputs
4 voltage outputs
2 pulse outputs (open collector)
Local Station
SA41
: Contact inputs, 4 dry contact inputs
SE5
: Contact I/O, 4 dry contact inputs
4 open collector outputs
SG4
: Analog inputs, 4 voltage inputs
SR3
: Analog I/O, 4 voltage inputs
4 voltage outputs
SS5
: Contact & analog inputs
4 dry contact inputs
4 voltage inputs
SS7
: Contact outputs & analog inputs
4 open collector outputs
4 voltage inputs
SP4
: Analog & pulse inputs
4 voltage inputs
4 dry contact pulse inputs
SS3
: Contact, analog & pulse inputs
2 dry contact inputs
4 voltage outputs
2 dry contact pulse inputs
POWER INPUT
AC Power
K
: 85 – 132 V AC
(Operational voltage range 85 – 132 V, 47 – 66 Hz)
APPLICATION TO NTT
Application form is available at local NTT sales offices. “Guide for Application for Dedicated Circuit Lease” is provided for free for detailed explanation.
COMMON SPECIFICATIONS
Construction
: lightning arrester, modem and I/O modules mounted on a chassis for surface mounting
Connection
•
Telephone circuit
: M4 screw terminals (torque 0.8 N·m)
•
Power & I/O
: M3.5 screw terminals (torque 0.8 N·m)
•
RUN contact output
: Euro type connector terminal
(Applicable wire size: ≤ 1.25 mm
2
, stripped length 8 mm)
•
Grounding
: M4 screw terminal (torque 0.8 N·m)
Screw terminal
•
Telephone circuit & g
rounding
: Nickel-plated steel
•
Power & I/O
: Chromated steel
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. 8 VA for 50bps, approx. 6 VA for 300bps
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 varies between the minimum and maximum values, depending upon the timing of input change.
Minimum Time = Simple Transmission Time
Maximum Time = Simple Transmission Time × 2
MOUNTING REQUIREMENTS unit: mm (inch)
FRONT PANEL CONFIGURATION & TERMINAL ASSIGNMENT
CONNECTION DIAGRAM
EXTERNAL DIMENSIONS & TERMINAL ASSIGNMENTS unit: mm [inch]
SYSTEM DESCRIPTIONS