U Directive
Function : Through instruction restores the normal brush can not write ROM program ; 
Scope : ROM program inserts inside the main chip MCU Series hard drive 
( no hard eight feet ROM chip circuit board ) ; Principle: Short drive circuit board CPU specific pin , 
using the command line specific programs ( not the data lines ) to the hard drive circuit board CPU 
sends activation commands and ROM data , so that the CPU ROM program work hard to regain control
How to use: install : NET4.0, 13XX series circuit board circuit board E112 point increase in voltage of 3.3V 
( orange line can connect the PC power supply 3.3V over ) then repair the ST COM line , 
then the hard drive power ( not connected to the data line ) : running the U command , 
select the COM port calls, following the SSS is the connection is successful, 
election documents, writing brush , it's that simple

Shorting method 1537 and 1590 E61 and P2
         1444 requires shorting P13 and P14

13xx is connected E41 E112
15XX above then E61 and P2
13XX E112 connected 3.3V High
14441552 ground like P14 P15 E41 E112 access
1537 1590 E61 pick P2
1552 E15 and E27

In fact, the meaning and the same idea to connect the external ROM is to make the circuit board 
from the external ROM boot but external ROM and no case will enter the COM channel

WD directive requires special brush to write a COM command line , RX TX Interface Connection: 
hard drive circuit board upward , downward plate body , jumpers at a total of eight needles , 
the middle two in a row following the information line .


U指令
功能:通过指令恢复无法正常刷写的ROM程序; 适用范围:ROM程序内镶在主控芯片MCU内的系列硬盘(无八脚ROM芯片的硬盘电路板); 
原理:短接硬盘电路板的CPU特定的脚位,利用指令线特定程序(不是数据线)向硬盘电路板的CPU发送激活指令和ROM数据,使CPU内ROM程序恢复控制硬盘工作
使用方法:先安装:NET4.0,13XX系列电路板在电路板E112点加3.3V电压(可以在PC电源橙线连3.3V过来)接修ST的COM线,接硬盘电源(不用接数据线)
:运行U指令,选COM口,呼叫,下面出SSS就是连接成功,选文件,刷写,就这么简单了

短接方法 1537和1590   E61和P2
         1444的需要短接P13 和P14

13xx的E112接E41
15XX以上的接E61和P2
13XX E112接3.3V高电平
1444 1552一样的 P14 P15接地 E112接E41
1537 1590 E61接P2
1552的E15和E27

其实意思和接外置ROM的思路一样  就是让电路板从外置ROM启动 但是外置ROM又没有的情况下 就会进入COM通道

WD指令刷写需要专用的COM指令线，RX TX接口接法：硬盘电路板向上，盘体向下，跳线处共八根针，下面一排中间两根为信息线。


