MMC Serial Mode, dumb question
hackman127
Posts: 34
Guys, I have a serious amateur question here about the serial connection on the MotorMindC. Pins 20 and 21 are TX, RX respectively. The DB9 Connection goes like this, correct?
DB9=>MMC
2 => 20
3 => 21
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Luke
The perversity of nature is nowhere better demonstrated by the fact that, when
exposed to the same atmosphere, bread becomes hard while crackers become soft.
DB9=>MMC
2 => 20
3 => 21
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Luke
The perversity of nature is nowhere better demonstrated by the fact that, when
exposed to the same atmosphere, bread becomes hard while crackers become soft.
Comments
If I'm reading what you're saying correctly, NO. When connecting from an RS-232 "sender" to an RS-232 "receiver", Tx ==> Rx and Rx ==> Tx, so:
/code
DB-9·············· MMC
·········
·2 (Tx)· ==>· 21 (Rx)
·3 (Rx)· <==· 20 (Tx)
code/
Regards,
Bruce Bates
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I thought the DB-9 was this:
2 => Rx
3 => Tx
http://www.zytrax.com/tech/layer_1/cables/tech_rs232.htm#db9
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Luke
The perversity of nature is nowhere better demonstrated by the fact that, when
exposed to the same atmosphere, bread becomes hard while crackers become soft.
My SINCERE apologies. I glanced up at my RS-232 "cheat sheet" and I thought I was looking at the DB-9 column, but I was looking at the DB-25 column. You are INDEED CORRECT!
I think I'm going to make up two different "cheat sheets" since this isn't the first time this has happened - sorry.
Regards,
Bruce Bates
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That's Ok! I had to go to the cheat sheet to figure that out as well. I've been known to make many of the same blunders, which is why I ask these dumb questions.
Thank you for your help.
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Luke
The perversity of nature is nowhere better demonstrated by the fact that, when
exposed to the same atmosphere, bread becomes hard while crackers become soft.