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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 2/4頁 |
| 文件大小： | 158K |
| 代理商： | LDM422 |
19
Figure 1. LDM422 Logic Diagram
TD
RD
RTS
EchoSup.
EchoSup.
DTR
DSR
RLSD
CTS
+ 12VDC
Gnd
Case
RLSD
RD
DCE
DTE
TD
RTS
DTR
Light= High= Space
+ V
CTS
*Light= High= Asserted
+ V
+ V
Light= Low= TD/RTSEnabled
Light= Low= Asserted
Light= Low= Space
+
-
+
-
B’
A’
RD
12VAC
PWRRTN
A’
B’
CTS
Opto-Iso
Barrier
+ V
+ V
+ V
-12VDC
B
B
A
A
TD
RTS
SIGRTN
SIGRTN
(IsolatedRS-422Ground)
*"Light"ispresenceoflight
acrossOpto-Isobarrier.
2
8
4
9
7
3
12
11
10
1
2
5
6
3
4
16
17
20
6
8
5
9
7
1
10
RS-232
P1
RS-422
P2
TD,RD
RTS,CTS,DTR,RLSD
Mark= -V;Space= + V
Asserted= + V,NotAsserted= -V
Mark
Space
Asserted
NotAsserted
AorA’
Low
High
High
Low
BorB’
High
Low
Low
High
NOTE: Open or Tri-State on RD inputs produces
same logic condition as ’MARK’ input. Open or
Tri-State on CTS inputs produces same logic
condition as ’Asserted’ input.
TD, RD
RTS, CTS
RS-232 P1 Pin Descriptions
Pin 1
Case
Pin 2
TD
Pin 3
RD
Pin 4
RTS
Pin 5
CTS
Pin 6
DSR
RS-422 P2 Pin Descriptions
Pin 1
12VAC
Pin 2
PWR RTN
Pin 3
RTS A
Pin 4
RTS B
Pin 5
CTS A'
Pin 6
CTS B'
Pin 7
TD A
Pin 8
TD B
Pin 9
SIG RTN
RD A'
Pin 11
RD B'
Pin 12
SIG RTN
Case Ground
Transmt Data
Receive Data
Request To Send
Clear To Send
Data Set Ready
(connected to Data
Termnal Ready)
Pin 7
Pin 8
Pin 9
Pin 10
Pin 16
GND
RLSD
+ 12VDC Positive DC Supply Input
–12VDC
Negative DC Supply Input
Echo Sup Echo Suppression
(tie to pin 17 to enable)
Echo Sup Echo Suppression
(tie to pin 16 to enable)
DTR
Data Termnal Ready
(connected to Data
Set Ready)
Receive Line Signal Detect Pin 10
Pin 17
Pin 20
The LDM422 conforms to EIA RS-232 and RS-422 specifications.
Data Termnal Ready must be asserted by the host RS-232 port before
the LDM422 can transmt data. When Data Termnal Ready is not
asserted all outputs of the LDM422 are high impedance, allowng up
to 32 LDM422 units to be multidropped on a common
communications cable. See Figures 1 and 3 for details.
Request To Send and Clear To Send are carried through the RS-422
port as two separate wre pairs. These may be used for full duplex
flowcontrol.
Cable Capacitance Effects On Distances
Specified distances in the specifications are for the wre sizes 18-
24AWG (0.82-0.20mm
2
) with a maximumcapacitance of 25pF/ft
(82pF/m). For higher capacitance cables, decrease distance
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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: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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