|
發表於 2012-4-14 14:12:13
|
顯示全部樓層
>25支腳當中有7支是GND~~有8支是接電阻(排阻)再接V+(好像是提升用的)~~
看你這個描述很像是Printer Port,若是沒用的腳+GND共8支腳接地,另8支腳有接電阻的是Data信號,一般輸入接頭,都是獨立信號的,不會混合兩種信號在一起.
25P的接頭有RS232與Printer Port.
若是透過RS232來通訊的,把電腦的資料送到投影版,其接頭為:
PC RS232(25P公接頭) → 25P母接頭,RS232延長線,25P公接頭 → 投影版RS232(25P母接頭)
若是用RS232,那麼在接頭附近應該會有傳送與接收的Driver與Buffer IC,板子上好像沒有看到.
若是用Printer Port,可能接線為:
PC Printer Port(25P母接頭) → 25P公接頭,Printer Port延長線,25P公接頭 → 投影版Printer Port(25P母接頭).
用Printer Port的延長線兩端之公母接頭,其使用較不一定,用RS232的較固定.
LCD投影機原理:
http://www.superhi-vision.com/Projector%20Buyers%20Guide_1.htm
投影機原理維護說明:
http://big5.xinhuanet.com/gate/b ... /22/c_121891785.htm
投影機的原理使用維護及保養,簡體:
http://www.google.com.tw/url?sa= ... Caj0nbg&cad=rja
投影機介紹,線上閱讀,Page 23,輸入接頭種類,裡面未列入Printer Port,可能已被拋棄.
http://wenku.baidu.com/view/463d8714cc7931b765ce154c.html
5. Pin signals and register bits (25P Printer Port 接腳之信號)
<= in DB25 Cent Name of Reg
=> out pin pin Signal Bit Function Notes
------ ---- ---- -------- --- -----------------------------
=> 1 1 -Strobe C0- Set Low pulse >0.5 us to send
=> 2 2 Data 0 D0 Set to least significant data
=> 3 3 Data 1 D1 ...
=> 4 4 Data 2 D2 ...
=> 5 5 Data 3 D3 ...
=> 6 6 Data 4 D4 ...
=> 7 7 Data 5 D5 ...
=> 8 8 Data 6 D6 ...
=> 9 9 Data 7 D7 Set to most significant data
<= 10 10 -Ack S6+ IRQ Low Pulse ~ 5 uS, after accept
<= 11 11 +Busy S7- High for Busy/Offline/Error
<= 12 12 +PaperEnd S5+ High for out of paper
<= 13 13 +SelectIn S4+ High for printer selected
=> 14 14 -AutoFd C1- Set Low to autofeed one line
<= 15 32 -Error S3+ Low for Error/Offline/PaperEnd
=> 16 31 -Init C2+ Set Low pulse > 50uS to init
=> 17 36 -Select C3- Set Low to select printer
== 18-25 19-30, Ground
33,17,16
http://www.lvr.com/files/ibmlpt.txt
Rs232 9P,25P之接腳信號.
http://www.aggsoft.com/rs232-pin ... ble-connections.htm
|
評分
-
1
查看全部評分
-
|