DS200TCEAG1BNE燃机模块,GE用户手册
电磁兼容性MVME2700是一种板级产品，用于标准VME应用程序。因此，这是系统的责任
集成商应满足与给定应用MVME2700已在具有代表性的底盘上进行了测试CE B级EMC认证。合规性是根据以下条件：
❏ 所有外部输入/输出端口上的屏蔽电缆。❏ 通过金属外壳连接器连接至接地的电缆屏蔽连接至导电模块前面板。❏ 导电底盘导轨连接至接地。这提供了将屏蔽层连接到接地的路径。
DS200TCEAG1BNE燃机模块❏ 前面板螺钉正确拧紧。对于最小射频发射，必须满足上述条件已实施。否则可能会影响EMC对包含模块的设备。介绍如本手册前几章所述，MVME2700系列通信接口有四个端口。其中两个是组合的同步/异步端口；另外两个只是异步的。同步和异步端口都提供EIA-232-D通过P2和MVME712M转换模块的DCE/DTE接口。异步串行端口MVME2700使用了美国国家航空公司的PC87308 ISASIO芯片半导体实现两个异步串行端口（in除了磁盘驱动器控制器、并行输入/输出和键盘/鼠标之外接口）。ISASIO设备提供的异步端口通过P2和相关的转换模块。TTL电平信号来自ISASIO芯片通过TTL驱动器和串联电阻器进行缓冲，然后通过EIA-232-D驱动器和接收器完成到MVME712M转换的异步串行接口单元MVME2700硬件支持的异步串行波特率为110B/s至38.4Kb/s。有关详细编程信息，请参MVME2600/2700系列单板中PCI和ISA总线的讨论计算机程序员参考指南和供应商SASIO装置的文件（在附录D中列出，相关
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
