5SHY5045L0020模块,ABB产品重量
VMEbus接口本地外围总线到VMEbus接口，VMEbus到本地外围总线接口和本地VMEbus DMA控制器在MVME197LE由VMEchip2提供。VMEchip2还可以提供VMEbus系统控制器起作用。请参阅中的VMEchip2章MVME197LE、MVME197DP和MVME197SP单板计算机详细编程信息的程序员参考指南。输入/输出接口MVME197LE为许多系统应用提供板载输入/输出。
5SHY5045L0020模块这个输入/输出功能包括串行端口、打印机端口、以太网收发器接口和SCSI大容量存储接口。
串行端口接口CD2401串行控制器芯片（SCC）用于实现四个串行
端口。串行端口支持标准波特率（110至38.4K波特）。串行端口4还支持同步操作模式。由于数量有限，这四个串行端口的功能不同输入/输出连接器上的引脚数量。串行端口1是最小功能异步端口。它使用RXD、CT、TXD和RTS。串行端口2和3是全功能异步端口。他们使用RXD、CT、DCD、TXD、RTS和DTR。串行端口4是一个全功能异步或同步端口。它可以以高达每秒64k位的同步比特率运行。它使用RXD、CT、，DCD、RTS和DTR。它还与同步时钟信号线连接。
请参阅MVME197LE、MVME197DP和MVME197SP单板计算机程序员串行端口接口绘图参考指南连接。所有四个串行端口使用EIA-232-D驱动器和接收器，位于主端口上所有信号线都被路由到输入/输出连接器。这个配置头位于MVME712X转换板上。一应使用MVME712X等外部输入/输出转换板来将输入/输出连接器引脚转换为行业标准连接器
VMEbus Interface
The local peripheral bus to VMEbus interface, the VMEbus to local peripheral
bus interface, and the local-VMEbus DMA controller functions on the
MVME197LE are provided by the VMEchip2. The VMEchip2 can also provide
the VMEbus system controller functions. Refer to the VMEchip2 chapter in the
MVME197LE, MVME197DP, and MVME197SP Single Board Computers
Programmer’s Reference Guide for detailed programming information.
I/O Interfaces
The MVME197LE provides onboard I/O for many system applications. The
I/O functions include serial ports, a printer port, an Ethernet transceiver
interface, and a SCSI mass storage interface.
Serial Port Interface
The CD2401 serial controller chip (SCC) is used to implement the four serial
ports. The serial ports support the standard baud rates (110 to 38.4K baud).
Serial port 4 also supports synchronous modes of operation.
The four serial ports are different functionally because of the limited number
of pins on the I/O connector. Serial port 1 is a minimum function
asynchronous port. It uses RXD, CTS, TXD, and RTS. Serial ports 2 and 3 are
full function asynchronous ports. They use RXD, CTS, DCD, TXD, RTS, and
DTR. Serial port 4 is a full function asynchronous or synchronous port. It can operate at synchronous bit rates up to 64k bits per second. It uses RXD, CTS,
DCD, RTS, and DTR. It also interfaces to the synchronous clock signal lines.
Refer to the MVME197LE, MVME197DP, and MVME197SP Single Board
Computers Programmer’s Reference Guide for drawings of the serial port interface
connections.
All four serial ports use EIA-232-D drivers and receivers located on the main
board, and all the signal lines are routed to the I/O connector. The
configuration headers are located on the MVME712X transition board. An
external I/O transition board such as the MVME712X should be used to
convert the I/O connector pinout to industry-standard connectors
