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參數(shù)資料
| 型號(hào)： | LDM422 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Fully Isolated Limited Distance Modem, RS-232/422 Converter |
| 中文描述： | 完全隔離的距離有限的調(diào)制解調(diào)器，RS-232/422轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 1/4頁(yè) |
| 文件大?。?/td> | 158K |
| 代理商： | LDM422 |
18
Features
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)
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
LDM422
Fully Isolated
Limited Distance Modem,
RS-232/422 Converter
Description
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 alumnumenclosure 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 screwtermnals.
The LDM422 series is designed for full duplex operation over two-
wre pairs. Outputs are tri-state, allowng multidropping of up to 32
units. Hardware handshake is available over two separate wre 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 Termnal Ready. A convenient null modemswtch is provided for
the data lines. The RS-422 interface supports Request To Send and
Clear To Send on separate wre 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 froma wall-mounted transformer or ± 12VDC to
pins 9 (+ ) and 10 (–) of the RS-232 connector.
Specifications
Model
LDM422
Baud Rate Range
0 – 19.2K
Baud Rate
Distance (mles)
Distance (km)
19.2K
1.14
1.8
9.6K
3
5
4.8K
4
6.7
2.4K
5
8.3
1.2K – 0
7
11.7
MaximumMultidrop
Units
32. Reduced distances may be required when as
many as 32 units are multidropped. Norestrictions
apply for distances of 1 mle (1.7 km) or less.
Common Mode
Isolation
Surge: 750V
Continuous: 500V
Differential Mode
Surge Protection
(9 devices)
(AC input)
ANSI/IEEE C37.90.1-1989
(all RS-422 inputs and outputs)
Channel Lines
(1)
TD, RD, RTS, CTS
Control Lines
(1)
RTS, CTS, DTR, DSR, RLSD
Modes
Asynchronous 4-wire duplex, 2-wire half-duplex,
2-wire simplex
Model
LDM422
Null ModemSwtch
1 (Reverses RS-232 pins 2 and 3)
RS-422 Output Drive
20mA mn/output
6k
mn/input
RS-422 Input Impedance
Power:
AC operation
(2)
DC operation
12VAC, ± 10%, 10W screwterms 1 & 2
+ 11.5VDC to + 17.0VDC @ 400mA on pin 9
-11.5VDC to -17.0VDC @ 400mA on pin 10
0
°
C to + 70
°
C 0 to 95% relative humdity,
noncondensing
Operating Environment
Dimensions
6.6 in x 2.1 in x 1.28 in
(167.6 mmx 53.3 mmx 32.5 mm)
Weight
PT3 and PT3E
7 oz (200 g) max
11.0 oz (311.8 g) max
MTBF
(3)
> 100,000 hrs
Notes: (1) TD = Transmt Data, RD = Receive Data, RTS = Request To Send, CTS =
Clear To Send. DTR = Data Termnal 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).
Dataforth does not authorize or warrant its products for use in life support/critical applications.
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參數(shù)描述 |
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| LDM-42257NI | 功能描述:LED 顯示器和配件 LED Display RoHS:否 制造商:Avago Technologies 顯示器類型:7 Segment 數(shù)位數(shù)量:2 字符大小:7.8 mm x 14.22 mm 照明顏色:Red 波長(zhǎng):628 nm 共用管腳:Common Anode 工作電壓:2.05 V 工作電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 35 C 封裝:Tube |
| LDM422-P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Fully Isolated Limited Distance Modem, RS-232/422 Converter |
| LDM422-PE | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Fully Isolated Limited Distance Modem, RS-232/422 Converter |
| LDM422-PT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Fully Isolated Limited Distance Modem, RS-232/422 Converter |
| LDM422-S | 制造商:Texas Instruments 功能描述:CONVERTER RS232-RS422 制造商:Texas Instruments 功能描述:CONVERTER, RS232-RS422 制造商:Texas Instruments 功能描述:CONVERTER, RS232-RS422; Convert From:RS-232; Convert To:RS-422; SVHC:No SVHC (19-Dec-2012); Baud Rate Max:19200; External Depth:173mm; External Length / Height:26mm; External Width:56mm; Operating Distance:11265m; Operating |
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