1746SC-INO4I模块,A-B说明书
MVME2700 VME模块消耗+5V DC、+12V DC和–来自VMEbus背板的12V直流电源，通过连接器P1和P2.3.3V DC和2.5V DC电源由车载+5V直流电。
MVME2700 VME模块MVME2700 VME模块提供+12V DC和（在MVME761中输入/输出模式）–通过多功能开关向过渡模块提供12V直流电源（可复位保险丝）F2和F3。这些电压源为
串行端口驱动程序和连接到转换的任何LAN收发器单元保险丝+5V直流电源通过多功能开关F1提供给基板的键盘和鼠标连接器与14针相结合LED夹层/远程重置接头J1。
1746SC-INO4I模块上的FUS LED（DS5）当所有三种电压都可用时，MVME2700前面板点亮。在MVME712M输入/输出模式下，MVME712M上的黄色DS1 LED也发出+12V直流LAN电源可用性的信号，反过来表明多功能开关F2良好。如果以太网收发器无法工作，请检查多功能开关F2。在MVME712M输入/输出模式下，MVME2700提供SCSI终端通过P2适配器板上的1A保险丝（F1）供电。如果保险丝如果SCSI设备损坏，则SCSI设备可能无法正常工作或根本无法正常工作。和P2适配器板，通过电缆连接到转换模块，并带有SCSI总线连接到转换模块，模块上的绿色SCSI指示灯SCSI终端电源可用时亮起。如果SCSI指示灯亮起转换模块在SCSI总线操作期间闪烁，检查保险丝F1是否接通P2适配器板。注意，因为SCSI总线上的任何设备都可以提供TERMPWR信号，因为MVME2700 FUS LED监控多个电压的状态，LED不会直接指示任何单个保险丝的状况。如果FUS LED闪烁或熄灭，检查所有保险丝（多功能开关）。在MVME761输入/输出模式下，MVME2700提供SCSI终端电源通过P2适配器板上的多功能开关（可复位保险丝）。MVME2700向14针组合式扬声器提供扬声器输出信号LED夹层/远程重置接头J1。当J1用作遥控器时卸下LED夹层，将扬声器拔出，重置连接器信号可以通过电缆连接到外部扬声器。对于J1的引脚分配，
参见表4-1。
The MVME2700 VME module draws +5V DC, +12V DC, and
–12V DC power from the VMEbus backplane through connectors P1 and
P2. The 3.3V DC and 2.5V DC power is derived on-board from the
+5V DC.
MVME2700 VME Module
The MVME2700 VME module furnishes +12V DC and (in MVME761
I/O mode) –12V DC power to the transition module through polyswitches
(resettable fuses) F2 and F3 respectively. These voltage sources power the
serial port drivers and any LAN transceivers connected to the transition
module. Fused +5V DC power is supplied through polyswitch F1 to the
base board’s keyboard and mouse connectors and to the 14-pin combined
LED-mezzanine/remote-reset connector, J1. The FUS LED (DS5) on the
MVME2700 front panel illuminates when all three voltages are available.
In MVME712M I/O mode, the yellow DS1 LED on the MVME712M also
signals the availability of +12V DC LAN power, indicating in turn that
polyswitch F2 is good. If the Ethernet transceiver fails to operate, check
polyswitch F2.
In MVME712M I/O mode, the MVME2700 supplies SCSI terminator
power through a 1A fuse (F1) located on the P2 adapter board. If the fuse
is blown, the SCSI device(s) may function erratically or not at all. With the
P2 adapter board cabled to a transition module and with an SCSI bus
connected to the transition module, the green SCSI LED on the module
illuminates when SCSI terminator power is available. If the SCSI LED on
the transition module flickers during SCSI bus operation, check fuse F1 on
the P2 adapter board.
Note Because any device on the SCSI bus can provide the TERMPWR
signal, and because the MVME2700 FUS LED monitors the
status of several voltages, the LED does not directly indicate the
condition of any single fuse. If the FUS LED flickers or goes out,
check all the fuses (polyswitches).In MVME761 I/O mode, the MVME2700 supplies SCSI terminator power
through a polyswitch (resettable fuse) located on the P2 adapter board.
The MVME2700 supplies a SPEAKER_OUT signal to the 14-pin combined
LED-mezzanine/remote-reset connector, J1. When J1 is used as a remote
reset connector with the LED mezzanine removed, the SPEAKER_OUT
signal can be cabled to an external speaker. For the pin assignments of J1,
refer to Table 4-1.
