5X00063G01模拟量输出模块，EMERSON配置教程

串行连接MVME172LX使用两个Zilog Z85230串行端口控制器来实现四个串行通信接口。每个接口支持CT、DCD、RTS和DTR控制信号以及TXD和RXD发送/接收数据信号。因为串行时钟是

在MVME172LX实现中省略了串行通信严格异步。Z85230作为DTE（数据终端）接口设备）具有EIA-232-D信号电平。串行端口路由到前面板上有四个RJ-45连接器。

5X00063G01模拟量输出模块有关EIA-232-D接口的更多信息，请参阅EIA232-D标准。MVME172LX上四个串行端口的连接图如下所示

如下图所示。这些端口连接到外部设备通过连接到前面板的电缆。介绍本章提供了有关MVME172LX通电的信息VME嵌入式控制器安装在系统中后，并描述了交换机、状态指示器和输入/输出端口的功能。有关编程信息，请参阅MVME172嵌入式控制器程序员参考指南。前面板开关和指示灯有两个开关（中止和重置）和四个LED（发光二极管）状态指示器（故障、运行、SCON和保险丝）位于MVME172LX前面板。向处理器发送中断信号。中断正常用于中止程序执行并将控制返回给调试器固件位于MVME172LX闪存中。连接到ABT开关的断路器是边缘敏感型电路，过滤以消除开关反弹。重置开关（Reset）重置所有车载设备。如果MVME172LX是系统控制器。SYSRESET*信号可能是由复位开关、通电复位、看门狗超时、，或通过VMEchip2专用集成电路。有关更多详细信息，请参阅第4章，功能描述Serial Connections

The MVME172LX uses two Zilog Z85230 serial port controllers to

implement the four serial communications interfaces. Each interface

supports CTS, DCD, RTS, and DTR control signals as well as the TXD

and RXD transmit/receive data signals. Because the serial clocks are

omitted in the MVME172LX implementation, serial communications are

strictly asynchronous. The Z85230 is interfaced as DTE (data terminal

equipment) with EIA-232-D signal levels. The serial ports are routed to

four RJ-45 connectors on the front panel.

For additional information on the EIA-232-D interface, refer to the EIA232-D Standard.

Connection diagrams for the four serial ports on the MVME172LX are

provided in the following figures. These ports are connected to external

devices through cables connected to the front panel.Introduction

This chapter provides information on powering up the MVME172LX

VME Embedded Controller after its installation in a system, and describes

the functionality of the switches, status indicators, and I/O ports.

For programming information, consult the MVME172 Embedded

Controller Programmer’s Reference Guide.

Front Panel Switches and Indicators

There are two switches (ABORT and RESET) and four LED (light-emitting

diode) status indicators (FAIL, RUN, SCON and FUSES) located on the

MVME172LX front panel. Sends an interrupt signal to the processor. The interrupt is normally

used to abort program execution and return control to the debugger

firmware located in the MVME172LX Flash memory.

The interrupter connected to the ABT switch is an edge-sensitive

circuit, filtered to remove switch bounce.

Reset Switch (RESET) Resets all onboard devices. Also drives a SYSRESET* signal if the

MVME172LX is system controller. SYSRESET* signals may be

generated by the Reset switch, a power-up reset, a watchdog timeout,

or by a control bit in the Local Control/Status Register (LCSR) in the

VMEchip2 ASIC. For further details, refer to Chapter 4, Functional

Description.