CEL-MAR ADA-1020 Скачать руководство пользователя страница 4

2.2. DESCRIPTION

ADA-1020 converter is a device used to convert the RS232 to current loop standard without interfering with the format of transmitted

data and does not require the power supplying from the RS232 port. The converter supports RS232 asynchronous data transmission

at baud rate up to 38.4 kbps via two pairs of twisted-pair cable.

ADA-1020 is equipped with one female DB-9F connection to connect RS232 interface and screw terminal block for connection of

Current Loop bus and power supply. Connector DB-9F RS232 interface is made like DCE, it let connect converter to computer in use

the typical extension cable RS232 (cable for modem connection) without crossing Tx with Rx and RTS with CTS. 

Converter uses signals Rx, Tx and GND for operating, which are entered via DB-9F connector. RTS signal is looped with CTS and

DTR with DSR and DCD inside the converter. Other signals are not connected.

You can connect to the Current Loop line two ADA-1020 converters operates in full duplex or half duplex mode in point-to-point

topology.

Fig 1. View of the ADA-1020

2.3. CURRENT LOOP TRANSMITTER 

The Current Loop transmitter at ADA-1020 is made as:

- active, on the base power source generate c/- 20mA or 0-20mA (depend on converter's version). The transmitter has short

circuit protection on TX+ and TX- lines.  

- passive 0-20mA, on the base transistor, has also short circuit protection on TX+ and TX- lines.

The transmitter of Current Loop 0-20mA can work as ACTIVE or Passive, the selection is made by the TX switch on the front panel

(see Fig.1).

The passive transmitter can be used only for creation of current loop bus, see point 3.5.

The diagram of the transmitter & receiver is shown on figure below.

2.4. CURRENT LOOP RECEIVER

In the ADA-1020 converter has been used passive RX receiver consisting of optoisolator (optical coupler) and protective elements.

The receiver circuit has RX+, RX- terminals as well as the terminal marked as RX-*. In the circuit  with RX-* terminal has been used

additional resistor (1000 ohms or 560 ohms depend on the converter version) to reduce power in the case of connecting the receiver

to transmitter which has NOT short circuit current limit to 20mA.

The RX red LED on front panel of the converter is a signalization of NO current flow through optocoupler. This LED is ON when it is:

- not connect transmitter to receiver,

- wrong connection of transmitter to receiver,

- broken connection of transmitter to receiver.

The diagram of the transmitter & receiver is shown on figure below.

4

ADA-1020

(RS-232)

(RS-232)

PWR

TX

RX

ADA-1020

RS-232 to CURRENT  LOOP

CONVERTER

CL

N

C

N

C

N

C

T

X

 +

T

X

 -

R

X

 +

R

X

 +

*

R

X

 -

(CURRENT LOOP)

V

 -

V

 +

10 – 30 

VDC

N

C

N

C

N

C

T

X

 +

T

X

 -

R

X

 +

R

X

 +

*

R

X

 -

(CURRENT LOOP)

V

 -

V

 +

10 – 30 

VDC

PWR

TX

RX

ADA-1020

RS-232 to CURRENT  LOOP

CONVERTER

CL

ACT

PSV

TX

62mm

 RS-232 interface

DB-9F connector

Power supply

10-24-30 VDC

53mm

1

0m

m

6m

m

9

0m

m

Current Loop

Interface

Version with active / passive transmitter 0 / 20mA

Version with active trans/- 20mA

 RS-232 interface

DB-9F connector

Current Loop

Interface

Power supply

10-24-30 VDC

Содержание ADA-1020

Страница 1: ...User manual ADA 1020 RS 232 to Current Loop converter 1 io_ada 1020_v3 26_en Copyright 2001 2020 CEL MAR sp j ADA 1020...

Страница 2: ...PORT DTE TYPE COMPUTER 6 3 2 2 CONNECTION OF DEVICES WITH RS232 PORT DCE TYPE MODEM 6 3 3 CONNECTION OF THE CURRENT LOOP INTERFACE DEVICES 7 3 3 1 CONNECTION OF THE CURRENT LOOP LINE TO ADA 1020 CONVE...

Страница 3: ...he supply network is only after disconnecting the power supply circuit voltage Do not carry out the assembly or dis assembly of the device if it is enabled This may result to short circuit and damage...

Страница 4: ...nsmitter of Current Loop 0 20mA can work as ACTIVE or Passive the selection is made by the TX switch on the front panel see Fig 1 The passive transmitter can be used only for creation of current loop...

Страница 5: ...le of adequate cross section due to voltage drops for converter powering not supply converter from power circuit device that generates large impulse interference such as transmitters contactors 3 1 AS...

Страница 6: ...e is shown below Fig 6 DCE type connection of ADA 1020 to device with RS232 interface eg modem 6 ADA 1020 RxD 2 TxD 3 DTR 4 DSR 6 RTS 7 CTS 8 PC SG 5 RS232 DTE DB 9M ADA 1020 Current Loop Vss Vss Powe...

Страница 7: ...ple connection of two ADA 1020 together The line length less than 500m 7 ADA 1020 Current Loop Line 2 pair twisted ADA 1020 Current Loop Vss Vss Power Supply RS232 DCE DB 9F CTS 7 RTS 8 GND 5 Vss Vss...

Страница 8: ...232 INTERFACE DEVICES TO CURRENT LOOP BUS In this case example the Current Loop bus is created by one ADA 1020 converter MASTER active transmitter and one ADA 1020 converter SLAVE active transmitter t...

Страница 9: ...urrent loop receiver of overvoltage arising Current Loop bus The number of the SLAVE converters can be less for long lines Example of connection is shown below 9 ADA 1020 GND RS232 Current Loop Bus MA...

Страница 10: ...roperly green LED PWR on front panel of converter should light if not check polarization of power connection and if RX red LED is lighted check the correctness of connection of the Current Loop transm...

Страница 11: ...VERSIONS ADA 1020 Order example Product Symbol ADA 1020 1 1 2 3 1 Current Loop Voltage 24VDC 1 Current Loop Type 20mA 2 1kV galvanic isolation 3 cover without inlets plug in screw terminal block Power...

Страница 12: ...ssion of disruptions according to the standard PN EN 55022 Safety requiring According to the PN EN60950 norm Environment Commercial and light industrial Environmental Parameters Operating temperature...

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