DS200TCEAG1BNE燃機(jī)模塊,GE用戶手冊(cè)
電磁兼容性MVME2700是一種板級(jí)產(chǎn)品，用于標(biāo)準(zhǔn)VME應(yīng)用程序。因此，這是系統(tǒng)的責(zé)任
集成商應(yīng)滿足與給定應(yīng)用MVME2700已在具有代表性的底盤上進(jìn)行了測(cè)試CE B級(jí)EMC認(rèn)證。合規(guī)性是根據(jù)以下條件：
? 所有外部輸入/輸出端口上的屏蔽電纜。? 通過金屬外殼連接器連接至接地的電纜屏蔽連接至導(dǎo)電模塊前面板。? 導(dǎo)電底盤導(dǎo)軌連接至接地。這提供了將屏蔽層連接到接地的路徑。
DS200TCEAG1BNE燃機(jī)模塊? 前面板螺釘正確擰緊。對(duì)于最小射頻發(fā)射，必須滿足上述條件已實(shí)施。否則可能會(huì)影響EMC對(duì)包含模塊的設(shè)備。介紹如本手冊(cè)前幾章所述，MVME2700系列通信接口有四個(gè)端口。其中兩個(gè)是組合的同步/異步端口；另外兩個(gè)只是異步的。同步和異步端口都提供EIA-232-D通過P2和MVME712M轉(zhuǎn)換模塊的DCE/DTE接口。異步串行端口MVME2700使用了美國國家航空公司的PC87308 ISASIO芯片半導(dǎo)體實(shí)現(xiàn)兩個(gè)異步串行端口（in除了磁盤驅(qū)動(dòng)器控制器、并行輸入/輸出和鍵盤/鼠標(biāo)之外接口）。ISASIO設(shè)備提供的異步端口通過P2和相關(guān)的轉(zhuǎn)換模塊。TTL電平信號(hào)來自ISASIO芯片通過TTL驅(qū)動(dòng)器和串聯(lián)電阻器進(jìn)行緩沖，然后通過EIA-232-D驅(qū)動(dòng)器和接收器完成到MVME712M轉(zhuǎn)換的異步串行接口單元MVME2700硬件支持的異步串行波特率為110B/s至38.4Kb/s。有關(guān)詳細(xì)編程信息，請(qǐng)參MVME2600/2700系列單板中PCI和ISA總線的討論計(jì)算機(jī)程序員參考指南和供應(yīng)商SASIO裝置的文件（在附錄D中列出，相關(guān)
EMC Compliance
The MVME2700 is a board-level product and is meant to be used in
standard VME applications. As such, it is the responsibility of system
integrators to meet the regulatory guidelines pertaining to a given
application. The MVME2700 has been tested in a representative chassis
for CE class B EMC certification. Compliance was achieved under the
following conditions:
? Shielded cables on all external I/O ports.
? Cable shields connected to earth ground via metal shell connectors
bonded to a conductive module front panel.
? Conductive chassis rails connected to earth ground. This provides
the path for connecting shields to earth ground.
? Front panel screws properly tightened.
For minimum RF emissions, it is essential that the conditions above be
implemented. Failure to do so could compromise the EMC compliance of
the equipment containing the module.Introduction
As described in previous chapters of this manual, the MVME2700 serial
communications interface has four ports. Two of them are combined
synchronous/asynchronous ports; the other two are asynchronous only.
Both synchronous and asynchronous ports supply an EIA-232-D
DCE/DTE interface via P2 and the MVME712M transition module.
Asynchronous Serial Ports
The MVME2700 uses a PC87308 ISASIO chip from National
Semiconductor to implement the two asynchronous serial ports (in
addition to the disk drive controller, parallel I/O, and keyboard/mouse
interface).
The asynchronous ports provided by the ISASIO device are routed through
P2 and the associated transition module. The TTL-level signals from the
ISASIO chip are buffered through TTL drivers and series resistors, then
routed through EIA-232-D drivers and receivers to complete the
asynchronous serial interface enroute to the MVME712M transition
module.
The MVME2700 hardware supports asynchronous serial baud rates of
110B/s to 38.4Kb/s. For detailed programming information, refer to the
PCI and ISA bus discussions in the MVME2600/2700 Series Single Board
Computer Programmer’s Reference Guide and to the vendor
documentation for the ISASIO device (listed in Appendix D, Related
