咱也来问个傻问题

[March]

大拿们给 我讲讲NULL cable 和 straight through cable具体是怎么回事.

 

[GreenGable]

Null cable, did you mean Null Modem Cable? Its a serial DTE-DTE cable, the 9 pin wiring is something like:

1,6 4
2 3
3 2
4 1,6
5 5
7 8
8 7

Straight through cable, if you were still talking about serial, its DTE - DCE. and the wiring is obvious... ;-)

But for cat5 ethernet, you have straight through and cross over cables too, but you were not talking about ethernet i suppose.

 

[胡说之]

都在这里:

http://www.bb-europe.com/tech_articles/faq_rs232_connections_work.asp

 

[March]

很有用. 多谢 :thanks::thanks: