Jun 17, 2013 #1 S SINDHURI Member level 2 Joined Dec 13, 2012 Messages 46 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,286 Activity points 1,662 Good Morning one and all, Is it possible to connect a DB9 Connector at the output of the MAX232 Board. Please any one can help me quickly. Thanks in Advance.
Good Morning one and all, Is it possible to connect a DB9 Connector at the output of the MAX232 Board. Please any one can help me quickly. Thanks in Advance.
Jun 17, 2013 #2 tpetar Advanced Member level 7 Joined Sep 27, 2010 Messages 6,417 Helped 1,713 Reputation 3,456 Reaction score 1,673 Trophy points 1,393 Location Pancevo-Belgrade, Serbia Activity points 37,363 MAX232 Examples MAX232 circuit: If there is no MAX232 this can help: Best regards, Peter :wink:
Jun 30, 2013 #3 A afridii Junior Member level 1 Joined May 15, 2013 Messages 18 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,281 Activity points 1,413 For first circuit shard by tpetar, if you want to communicate between your PC and ucontroller you should use null modem connection, google it , its construction is simple.
For first circuit shard by tpetar, if you want to communicate between your PC and ucontroller you should use null modem connection, google it , its construction is simple.
Jun 30, 2013 #4 andre_luis Super Moderator Staff member Joined Nov 7, 2006 Messages 9,601 Helped 1,190 Reputation 2,399 Reaction score 1,208 Trophy points 1,403 Location Brazil Activity points 55,716 tpetar, Unless be powered by negative supply instead GND, 2nd circuit will not work due to RS232 standard voltage level requirements. [-12,-3] <--> [+3,+12] +++
tpetar, Unless be powered by negative supply instead GND, 2nd circuit will not work due to RS232 standard voltage level requirements. [-12,-3] <--> [+3,+12] +++
Jun 30, 2013 #5 alexan_e Administrator Joined Mar 16, 2008 Messages 11,888 Helped 2,021 Reputation 4,158 Reaction score 2,031 Trophy points 1,393 Location Greece Activity points 64,371 The capacitor in the second circuit is used as a negative charge pump https://www.uchobby.com/index.php/2007/06/11/ttl-to-rs232-adaptor-explained/ - - - Updated - - - I remember a discussion about a similar circuit posed https://www.edaboard.com/threads/200678/#post844284 , there are some problems with is as FvM has pointed out. Alex
The capacitor in the second circuit is used as a negative charge pump https://www.uchobby.com/index.php/2007/06/11/ttl-to-rs232-adaptor-explained/ - - - Updated - - - I remember a discussion about a similar circuit posed https://www.edaboard.com/threads/200678/#post844284 , there are some problems with is as FvM has pointed out. Alex
Jun 30, 2013 #6 andre_luis Super Moderator Staff member Joined Nov 7, 2006 Messages 9,601 Helped 1,190 Reputation 2,399 Reaction score 1,208 Trophy points 1,403 Location Brazil Activity points 55,716 I tried perform mentally a circuit working simulation and did not understand how this capacitor could be reversely polarized. +++
I tried perform mentally a circuit working simulation and did not understand how this capacitor could be reversely polarized. +++