Datasheet > LDM422-SE

LDM422-SE

更新时间： 2024-09-13 05:41:43

品牌	Logo	应用领域
其他 - ETC		转换器调制解调器
页数	文件大小	规格书
4页	148K
描述
Fully Isolated Limited Distance Modem, RS-232/422 Converter

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LDM422-SE 数据手册

LDM422

Fully Isolated

Limited Distance Modem,

RS-232/422 Converter

Description

Features

The LDM422 is a compact RS-232 to RS-422 converter which features

a complete electrical isolation barrier and heavy duty electrical surge

protectors. These devices feature a rugged aluminum enclosure small

enough to mount on the back panel of typical computer equipment,

saving valuable desk and floor space. Isolation is provided by optical

couplers and a DC-to-DC converter. The RS-232 connection is through

male or female EIA 25-pin connectors. The RS422 connections are

made through convenient solderless screw terminals.

Á COMPLETE ISOLATION WITH OPTICAL

COUPLERS AND POWER DC-TO-DC

CONVERTER

Á INDUSTRIAL SURGE PROTECTION DEVICES

Á SIX LED DIAGNOSTIC INDICATORS

Á DC TO 19,200 BAUD AT 6000 FEET (1800M),

9600 BAUD AT 3 MILES (5KM)

The LDM422 series is designed for full duplex operation over two-

wire pairs. Outputs are tri-state, allowing multidropping of up to 32

units. Hardware handshake is available over two separate wire pairs.

Data rates are 75 to 19,200 baud. Six diagnostic LED indicators are

provided (see Figure 1) for installation guidance and system

troubleshooting. The RS-232 interface supports Request To Send,

Clear To Send, Data Set Ready, Received Line Signal Detect, and

Data Terminal Ready. A convenient null modem switch is provided for

the data lines. The RS-422 interface supports Request To Send and

Clear To Send on separate wire pairs. The LDM422 may be used to

convert two sets of send and receive channels by using RTS and CTS

circuits as the second data channels. Data rates are the same. The

units use 12VAC from a wall-mounted transformer or ± 12VDC to

pins 9 (+ ) and 10 (–) of the RS-232 connector.

Á REQUEST-TO-SEND, CLEAR-TO-SEND

HANDSHAKE

Á TRI-STATE OUTPUTS FOR MULTIDROP

APPLICATIONS

Á SELECTION OF CONNECTORS

Á WIDE OPERATION TEMPERATURE RANGE

Á SOLDERLESS SCREW TERMINAL FIELD

CONNECTIONS

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

Model

LDM422

1 (Reverses RS-232 pins 2 and 3)

20mA min/output

Specifications

Null Modem Switch

RS-422 Output Drive

RS-422 Input Impedance

Power:

Model

LDM422

Baud Rate Range

0 – 19.2K

6kΩ min/input

Baud Rate

Distance (miles)

Distance (km)

19.2K

1.14

1.8

9.6K 4.8K

2.4K 1.2K – 0

6.7

(2)

8.3

11.7

AC operation

12VAC, ± 10%, 10W screw terms 1 & 2

+ 11.5VDC to + 17.0VDC @ 400mA on pin 9

-11.5VDC to -17.0VDC @ 400mA on pin 10

DC operation

Operating Environment

Dimensions

Maximum Multidrop

Units

32. Reduced distances may be required when as

many as 32 units are multidropped. No restrictions

apply for distances of 1 mile (1.7 km) or less.

0°C to + 70°C 0 to 95% relative humidity,

noncondensing

Common Mode

Isolation

Surge: 750V

Continuous: 500V

6.6 in x 2.1 in x 1.28 in

(167.6 mm x 53.3 mm x 32.5 mm)

Differential Mode

Surge Protection

(9 devices)

(AC input)

ANSI/IEEE C37.90.1-1989

(all RS-422 inputs and outputs)

Weight

PT3 and PT3E

7 oz (200 g) max

11.0 oz (311.8 g) max

Channel Lines⁽¹⁾

Control Lines⁽¹⁾

Modes

TD, RD, RTS, CTS

(3)

MTBF

> 100,000 hrs

RTS, CTS, DTR, DSR, RLSD

Notes: (1) TD = Transmit Data, RD = Receive Data, RTS = Request To Send, CTS =

Clear To Send. DTR = Data Terminal Ready, DSR = Data Set Ready, RLSD = Received

Line Signal Detect. (2) 120VAC and 220VAC power transformers are available. (3) Ground-

benign environmental conditions (no salt atmosphere, < 50°C ambient temperature).

Asynchronous 4-wire duplex, 2-wire half-duplex,

2-wire simplex

12 3 4

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与LDM422-SE相关器件

型号	品牌	获取价格	描述	数据表
LDM422-ST	ETC	获取价格	Fully Isolated Limited Distance Modem, RS-232/422 Converter
LDM485	ETC	获取价格	Fully Isolated Limited Distance Modem, RS-232/485 Converter
LDM485-P	ETC	获取价格	Fully Isolated Limited Distance Modem, RS-232/485 Converter
LDM485-PE	ETC	获取价格	Fully Isolated Limited Distance Modem, RS-232/485 Converter
LDM485-PT	ETC	获取价格	Fully Isolated Limited Distance Modem, RS-232/485 Converter
LDM485-S	ETC	获取价格	Fully Isolated Limited Distance Modem, RS-232/485 Converter
LDM485-SE	ETC	获取价格	Fully Isolated Limited Distance Modem, RS-232/485 Converter
LDM485-ST	ETC	获取价格	Fully Isolated Limited Distance Modem, RS-232/485 Converter
LDM660/05LT	ROITHNER	获取价格	LASERDIODEMODULE TYPE
LDM660/3LJ	ROITHNER	获取价格	TECHNICHAL DATA

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