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777854-02

更新时间: 2024-02-21 18:13:59
品牌 Logo 应用领域
美国国家仪器公司 - NI /
页数 文件大小 规格书
3页 65K
描述
Analog Circuit

777854-02 技术参数

生命周期:Contact ManufacturerReach Compliance Code:compliant
风险等级:5.6Is Samacsys:N
Base Number Matches:1

777854-02 数据手册

 浏览型号777854-02的Datasheet PDF文件第2页浏览型号777854-02的Datasheet PDF文件第3页 
Serial Interfaces  
for RS-485 and RS-232  
PCI, PXI/CompactPCI, PCMCIA, and ISA Interfaces  
Compatible with standard PC serial port PCI-232, PXI-8420, PXI-8422,  
Full Windows 2000/9x Plug and Play  
compatibility for switchless  
conguration  
PCMCIA-232, AT-232  
RS-232 interfaces  
Cable lengths to 15.6 m (50 ft)  
2, 4, 8, and 16 ports  
Handle RTS/CTS hardware  
handshake lines  
460 kb/s maximum transfer rate  
Transmit and receive FIFOs up to  
64 bytes  
Note: Features vary depending  
on board model. See detailed  
specifications.  
Driver Software  
NI-Serial for  
Windows 2000/NT/Me/9x  
Interrupt-sharing between ports  
2000 V isolation  
PCI-485, PXI-8421, PXI-8423,  
PCMCIA-485, AT-485  
Application Software  
LabVIEW  
Measurement Studio  
Lookout  
C/C++  
Visual Basic  
RS-485 or RS-422 interfaces  
Communicates with up to 31 devices  
Automatic transceiver-control mode  
for 2-wire RS-485 devices  
Cable lengths to 1.2 km (4000 ft)  
Any package written to the Microsoft  
serial driver interface  
Overview  
Cabling  
EXPRESS  
CODES  
Th e Nation al In stru men ts serial in terface board s for PCI,  
Our 2 and 4-port serial devices are not  
PXI/CompactPCI, PCMCIA, and ISA are asynchronous serial interfaces shipped with serial interface cables. Two-  
for communicating with serial devices. Depending on the platform, port versions use DB-9 male connectors  
interfaces are available with up to 16 ports and full Windows 2000/9x with standard pin assignments for RS-485  
Plug and Play compatibility, which gives you the benet of automatic and RS-232 connectors (see Figure 1).  
conguration for easier installation and maintenance. You can install Four-port devices use 10-position modular  
For information or to  
buy products online,  
visit ni.com/catalog  
and enter:  
pxi8420  
at232  
and use these boards as standard serial ports from your existing  
applications. Development environments such as Visual Basic, Visual  
C++, and Excel, as well as our LabVIEW, Measurement Studio, and  
Lookout application software products, can access the add-in serial  
ports using standard serial I/O functions. All interface devices include  
an enhanced serial driver for improved performance, reliable interrupt  
sharing between ports, and access to the advanced transceiver  
control mode of the RS-485 interface devices.  
phone jacks, so all four connectors can  
at485  
pci232  
pci485  
pcmcia232  
pcmcia485  
Pin 5  
Pin 1  
Pin 9  
Pin 6  
Figure 1. DB-9 Connector Pin Locations  
Isolation  
exist on a single back panel (see Figure 2). When purchasing a 4-port  
A common problem in many industrial applications is ground loops – serial device, you must order cables that convert the phone jacks to  
current owing through the ground line when ground voltage levels either DB-9 or DB-25 male connectors with standard pin assignments.  
differ between connected devices. On RS-485, this problem results in  
In general, you should order four converter cables per 4-port serial  
a common-mode voltage produced by the difference in ground levels device. Note that a converter cable is not designed to go the full  
or by noise induced on both lines. Isolation of serial ports eliminates distance from a 4-port serial interface directly to your instruments. Our  
this problem and protects the computer system in harsh industrial most popular converter cables convert the 10-pin phone jack on a  
environments. The National Instruments PCI, PXI/ CompactPCI,  
Pin 1  
Pin 10  
PCMCIA , and AT serial devices are available with optical isolation up  
to 2000 V for such applications.  
Figure 2. 10-Position Modular Jack Pin Locations  
National Instruments 821  
Tel: (512) 794-0100 • Fax: (512) 683-9300 • info@ni.com • ni.com  

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