UAD149A00-0-11控制卡件，ABB使用指导
串行端口3传输时钟配置（J18）在使用MVME761转换的同步串行通信中模块，您可以配置MVME2603/2604上的串行端口3以使用TxC信号线提供的时钟信号。在MVME761上-兼容版本的基板、收割台J18将端口3配置为驱动或接收TxC。出厂配置将端口3设置为接收TxC。
UAD149A00-0-11控制卡件J18在MVME712M兼容版本上保持打开状态。要完成串行端口3的配置，必须在MVME761转换模块（串行端口3时钟配置）。图1-7和图1-8（适用于MVME712M）以及图1-14和图1-15（对于MVME761）显示了整体跳线设置串行端口的MVME2603/2604和转换模块上需要3 DCE或DTE配置。系统控制器选择（J22）MVME2603/2604在工厂配置为VMEbus系统控制器通过跳线头J22。如果您选择“自动”系统控制器通过在J22引脚2和3上放置跳线来实现功能MVME2603/2604通过其在总线上的位置。如果电路板位于左侧的第一个插槽中，则将自身配置为系统控制器。如果MVME2603/2604不作为系统控制器，在任何情况下，将跳线放在J22上针脚1和2。当电路板作为系统控制器工作时，SCONLED亮起。远程状态和控制MVME2603/2604前面板LED和开关安装在可拆卸夹层板。卸下LED夹层使夹层连接器（J1，键控双排14针连接器）可用用作远程状态和控制连接器。在此应用中，J1可连接至用户提供的外部电缆，以承载重置和将中止信号和LED线路连接到远离控制面板的控制面板MVME2603/2604。最大电缆长度为15英尺。
第4章中的表4-1，连接器引脚分配列出了引脚编号J1的信号助记符。
MVME712M过渡模块准备MVME712M过渡模块（图1-3）和P2适配器板是与MVME2603/2604基板一起使用。MVME712M的特点包括：
❏ 并行打印机端口
❏ 支持AUI连接的以太网接口
❏ 一个同步/异步，只有三个异步，EIA-232-D多协议串行端口
Serial Port 3 Transmit Clock Configuration (J18)
In synchronous serial communications using the MVME761 transition
module, you can configure Serial Port 3 on the MVME2603/2604 to use
the clock signals provided by the TxC signal line. On MVME761-
compatible versions of the base board, header J18 configures port 3 to
either drive or receive TxC. The factory configuration has port 3 set to
receive TxC. J18 remains open on MVME712M-compatible versions.
To complete the configuration of Serial Port 3, you must set J2 on the
MVME761 transition module (Serial Port 3 clock configuration) as well.
Figure 1-7 and Figure 1-8 (for the MVME712M) and Figure 1-14 and
Figure 1-15 (for the MVME761) diagram the overall jumper settings
required on the MVME2603/2604 and transition module for a Serial Port
3 DCE or DTE configuration.System Controller Selection (J22)
The MVME2603/2604 is factory-configured as a VMEbus system
controller by jumper header J22. If you select the “automatic” system
controller function by placing a jumper on J22 pins 2 and 3, the
MVME2603/2604 determines whether it is the system controller by its
position on the bus. If the board is in the first slot from the left, it
configures itself as the system controller. If the MVME2603/2604 is not to
be system controller under any circumstances, place the jumper on J22
pins 1 and 2. When the board is functioning as system controller, the SCON
LED is turned on.Remote Status and Control
The MVME2603/2604 front panel LEDs and switches are mounted on a
removable mezzanine board. Removing the LED mezzanine makes the
mezzanine connector (J1, a keyed double-row 14-pin connector) available
for service as a remote status and control connector. In this application, J1
can be connected to a user-supplied external cable to carry the Reset and
Abort signals and the LED lines to a control panel located apart from the
MVME2603/2604. Maximum cable length is 15 feet.
Table 4-1 in Chapter 4, Connector Pin Assignments lists the pin numbers
and signal mnemonics for J1.
MVME712M Transition Module Preparation
The MVME712M transition module (Figure 1-3) and P2 adapter board are
used in conjunction with the MVME2603/2604 base board.
The features of the MVME712M include:
❏ A parallel printer port
❏ An Ethernet interface supporting AUI connections
❏ One synchronous/asynchronous, and three asynchronous only,
EIA-232-D multiprotocol serial ports
