Datasheet > LDM2485B-SJ4

LDM2485B-SJ4

更新时间： 2024-11-28 21:55:47

品牌	Logo	应用领域
其他 - ETC		转换器
页数	文件大小	规格书
1页	70K
描述
Signal Powered High Speed RS-232 to RS-485 Converters

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LDM2485B-SJ4 数据手册

LDM2485A and

LDM2485B

Signal Powered High Speed

RS-232 to RS-485 Converters

Dataforth’s Model LDM2485A & LDM2485B high speed, RS-232 to RS-

485 interface converters can turn your PC, terminal or other RS-232 device

into an RS-485 workstation. Operating over 2 to 4 wires, at data rates up to

115.2 kbps, Models LDM2485A & LDM2485B let your RS-232 machine talk

with up to 50 addressable devices in a multipoint polling environment. Since

multipoint environments can be difficult to work with, these products have

five separate configuration parameters (carrier control, RTS/CTS delay,

receive impedance, transmit-off impedance and echo) that allow you to fine

tune the converters to your particular application. And to keep your application

up and running, both models have built in surge protection. The Model

LDM2485A has a DB-25 connector for RS-232 environments, while the Model

LDM2485B has a DB-9 connector for EIA-574. Both models have several

options for twisted pair connection.

Features

Á AVAILABLE WITH DB-25 (RS-232) OR

DB-9 (EIA-574) INTERFACE

Á CONFORMS TO THE EIA RS-485 STANDARD

Á OPERATES ASYNCHRONOUSLY, POINT-TO-

POINT OR MULTIPOINT, OVER 2 OR 4 WIRES

Á UP TO 50 TERMINAL DROPS IN A MULTIPOINT

POLLING ENVIRONMENT

Á DATA RATES TO 115,200 BPS

Á RANGE UP TO 9.0 MI (14.5 KM)

Specifications

Model

Transmission Format

Data Rate Range

Data Rate bps

LDM2485A/LDM2485B

Asynchronous

Á DATA PLUS ONE CONTROL SIGNAL PASSED IN

EACH DIRECTION

0-115.2K bps

115.2K

Á SELECTABLE RTS-CTS DELAY

38.4K

9.6K

4.6

14.5

1.2K

9.0

Distance

4.2

2.6

4.7

2.9

7.4

Á ABLE TO OPERATE WITH OR WITHOUT “ECHO”

Á CARRIER MAY BE CONTINUOUS OR

RS-232/EIA-574 Interface DB-25/DB-9

“CONTROLLED BY RTS”

RS-485 Interface Options RJ-11 or RJ-45 jack or terminal block

with strain relief

Á NO AC POWER OR BATTERIES REQUIRED

Á 600 WATTS OF SILICON AVALANCHE DIODE

Transmit Line

Transmit Mode

Control Signals

2, 4 wire unconditioned twisted pair

SURGE PROTECTION –STANDARD

4-wire, full or half duplex; 2-wire half duplex

DSR turns “ON” immediately after the

Dataforth does not authorize or warrant its products for use in life support/critical applications.

terminal raises DTR; DCD turns “ON” after

recognizing the receive signal from the line;

CTS turns “ON” after the terminal raises RTS.

Ordering Information

LDM2485A-P

LDM2485A-S

Male DB-25 w/terminal block

Female DB-25 w/terminal block

Male DB-25 w/RJ-11 jack

Female DB-25 w/RJ-11 jack

Male DB-25 w/RJ-45 jack

Female DB-25 w/RJ-45 jack

Male DB-25 w/female DB-25

Female DB-25 w/female DB-25

Male DB-9 w/terminal block

Female DB-9 w/ terminal block

Male DB-9 w/RJ-11 jack

RTS/CTS delay

Carrier

0 or 8 msec

The carrier is switch selected either

continuous operation or controlled by RTS

LDM2485A-PJ1

LDM2485A-SJ1

LDM2485A-PJ4

LDM2485A-SJ4

LDM2485A-P25S

LDM2485A-S25S

LDM2485B-P

Surge Protection

Power

600W power dissipation at 1 ms

Draws operating power from the RS-232 or

EIA-574 data and control signals; no AC

power or batteries required.

Temperature

32° to 122° F (0° to 50° C)

LDM2485B-S

Size: 2485A

Size: 2485B

2.66" x 2.10" x 0.73" (68 x 53 x 19 mm)

2.50" x 1.20" x 0.75" (64 x 31 x 19 mm)

LDM2485B-PJ1

LDM2485B-SJ1

LDM2485B-PJ4

LDM2485B-SJ4

Female DB-9 w/RJ-11 jack

Male DB-9 w/RJ-45 jack

Female DB-9 w/RJ-45 jack

Weight

2 oz (57 gm)/1.4 oz (40 gm)

中文翻译

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