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參數(shù)資料
| 型號： | PCI24 |
| 英文描述： | PC(ISA)BUS I/O CARD |
| 中文描述： | 電腦（ISA）總線的I / O卡 |
| 文件頁數(shù)： | 5/14頁 |
| 文件大小： | 178K |
| 代理商： | PCI24 |
&21752/ 6<67(06
J223 PCI24
2192-10422-000-000
Page 5
Operation
Reading or Writing to the Board
Control of the PCI24 is achieved by writing to a pointer register and then accessing a data
register to read or write the required I/O register. The pointer register need only be written with
a new value if a different register is to be accessed. The board occupies only two bytes of
PCbus I/O space. Each time the board is accessed the red LED will flash momentarily.
Opto-isolated Inputs
There are three groups each of 8 bits connected via opto-isolators to the D connector. They
are considered as a group as all eight bits are read from at the same time.
When reading groups as inputs it is important to be aware of the input polarity. A current
flowing through an opto-isolator’s LED makes it output turn on. This is read through an
inverting buffer. The current flowing through the LED is read as a 1 by the PC for that particular
bit. There are two ways to make the current flow through the LED. One is to connect the +ve
side of its input pair to a +ve voltage and sink current from the -ve side. The other is to connect
the -ve side to a –ve voltage and source current into the +ve side.
By the use of links it is possible to connect the input’s anode (+ve) side to pin 50 of PL2. The
idea behind commoning the positive sides of the inputs is that most devices being sensed by
the PCI24 will be ‘open-collector’.
When 00 is written to base address this sets up the pointer to the group 0 inputs. These can
then be read by reading base address + 1.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCI-24 | 制造商:Pan Pacific 功能描述: |
| PCI-28 | 制造商:Pan Pacific 功能描述: |
| PC-I2C-DEV | 功能描述:界面開發(fā)工具 I2C Software Development Kit RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
| PC-I2C-KIT | 功能描述:界面開發(fā)工具 Let Your PC Talk I2C Version 3.3a Upgrade RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
| PCI-300 | 制造商:SLPOWER 制造商全稱:SL Power Electronics 功能描述:300 WATTS POWER FACTOR CORRECTED MULTIPLE OUTPUT |
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