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參數(shù)資料
| 型號(hào)： | LDM485-ST |
| 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)： | 2/4頁(yè) |
| 文件大小： | 179K |
| 代理商： | LDM485-ST |
23
RS-232 P1 Pin Descriptions
Pin 1
Case
Pin 2
TD
Pin 3
RD
Pin 4
RTS
Pin 5
CTS
Pin 6
DSR
RS-485 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)
Signal Ground
Receive Line Signal Detect Pin 10
+ 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)
Pin 7
Pin 8
Pin 9
Pin 10
Pin 16
Sig Gnd
RLSD
Pin 17
Pin 20
The LDM485 conforms to EIA RS-232 and RS-485 specifications.
Data Termnal Ready must be asserted by the host RS-232 port before
the LDM485 can transmt data. When Data Termnal Ready is not
asserted, all outputs of the LDM485 are high impedance, allowng up
to 64 LDM485 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-485
port as two separate wre pairs. These may be used for full duplex
flowcontrol.
Cable Capacitance Effects On Distances
The distances in the specifications are for the wre sizes 18-24AWG
(0.82-0.20mm
2
) wth a maximumcapacitance of 25pF/ft (82pF/m).
For higher capacitance cables, decrease distance specifications for
Figure 1. LDM485 Logic Diagram
TD
RD
RTS
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
+
-
+
-
8
7
4
3
B’
A’
RD
12VAC
PWRRTN
A’
B’
CTS
Opto-Iso
Barrier
+ V
+ V
+ V
-12VDC
RTS
TD
SIGRTN
SIGRTN
(IsolatedRS-485Ground)
*"Light"ispresenceoflight
acrossOpto-Isobarrier.
EchoSup.
EchoSup.
+ 5I
1k
120
1k
+ 5I
1k
120
1k
5
2
1
2
3
4
6
8
5
9
7
1
10
6
9
16
17
20
RS-232
P1
RS-485
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
a Mark state, and on CTS inputs produces an
Asserted state.
TD, RD
RTS, CTS
11
12
10
B
A
B
A
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