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參數(shù)資料
| 型號(hào)： | LDM485-P |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | RS-232 |
| 英文描述： | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| 中文描述： | 5V的高速RS - 232收發(fā)器與0.1uF電容 |
| 文件頁(yè)數(shù)： | 1/4頁(yè) |
| 文件大?。?/td> | 179K |
| 代理商： | LDM485-P |
22
LDM485
Fully Isolated
Limited Distance Modem,
RS-232/485 Converter
Description
The LDM485 is a compact RS-232 to RS-485 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 RS-485 connections are
made through convenient solderless screwtermnals.
The LDM485 series is designed for full duplex operation over two-
wre pairs. Outputs are tri-state, allowng multidropping of up to 64
units. Hardware handshake is available over two separate wre pairs.
Data rates are DC to 57.6k 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. Also, a line termination switch connects a line
termnation resistor and line bias resistors to the RS-485 receive lines.
The RS-485 interface supports Request To Send and Clear To Send
on separate wre pairs. The LDM485 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 to screwtermnals 1 and 2 on the
RS-485 connector. Alternately, they can use ± 12VDC to pins 9 (+ )
and 10 (–) of the RS-232 connector.
Specifications
Model
LDM485
Baud Rate Range
0 – 57.6K
Baud Rate
Distance (mles)
(1)
Distance (km)
57.6K 38.4K 19.2K
0.5
1
0.8
1.7
9.6K
4
6.7
4.8K 2.4K – 0
5
8.3
3
5
8
13.3
Wire Capacitance
Equal to 25pF per foot and up to 32 multidrop units
MaximumMultidrop Units
64
Common Mode
Isolation
Surge: 1500V
Continuous: 1000V
Differential Mode
Surge Protection
(9 devices)
(AC input)
ANSI/IEEE C37.90.1-1989
(all RS-485 inputs and outputs)
Modes
Asynchronous 4-wire duplex, 2-wire half-duplex,
2-wire simplex
Model
LDM485
Channel Lines
(2)
TD, RD, RTS, CTS
Control Lines
(2)
RTS, CTS, DTR, DSR, RLSD
Null ModemSwtch
1 (Reverses RS-232 pins 2 and 3)
RS-485 Output Drive
60mA max/output
12k
mn/input
RS-485 Input Impedance
Power:
AC operation
(3)
DC operation
12VAC, ± 10%, 10W screwterms 1 & 2
+ 11.5 to + 17VDC @ 500mA on pin 9
-11.5 to -17VDC @ 100mA on pin 10
0
°
C to + 70
°
C, 0-95% 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, PT3E
7 oz (200 g) max
11.0 oz (311.8 g) max
MTBF
(4)
> 100,000 hrs
Notes: (1) Distances reduced if multidropping more than 32 units; by 30% for 33-48 units, 50% for 49-
64. (2) 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. (3) 120VAC and 220
VAC power transformers are available. (4) 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.
Features
á
COMPLETE ISOLATION WITH OPTICAL COUPLERS
AND POWER DC-TO-DC CONVERTER
á
INDUSTRIAL SURGE PROTECTION DEVICES
á
SIX LED DIAGNOSTIC INDICATORS
á
19.2K BAUD AT 3 MILES (5KM), 57.6K BAUD AT 0.5
MILES (0.8KM)
á
REQUEST-TO-SEND, CLEAR-TO-SEND HANDSHAKE
á
TRI-STATE OUTPUTS FOR MULTIDROP
APPLICATIONS, UP TO 64 DEVICES
á
SELECTION OF CONNECTORS
á
WIDE OPERATING TEMPERATURE RANGE
á
SOLDERLESS SCREW TERMINAL FIELD
CONNECTIONS
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LDM485-PE | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| LDM485-PT | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| LDQ-M282RI | 0.28 inch FOUR DIGT, SEVEN SEGMENT DISPLAY, GREEN, GRAY FACE WITH MILKY WHITE DIFFUSED SEGMENTS |
| LDQ-M512RI | LDQ-M512RI |
| LDQ-M514RI | LDQ-M514RI |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LDM485-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-232/485 Converter |
| LDM485-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-232/485 Converter |
| LDM485-S | 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-232/485 Converter |
| LDM485-SE | 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-232/485 Converter |
| LDM485-ST | 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-232/485 Converter |
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