HW Design Question MAX232 w/USB to Serial
Posted: Mon May 17, 2010 3:45 pm
Hello,
I am hoping someone might be able to answer this.
I usually place a MAX232 chip in my designs for RS232 communication to a PC. Since Serial ports are not often found on new computers I have been using a USB to serial converter cable to communicate with a PC.
If I am using a USB to Serial converter cable is the MAX232 necessary? It would be nice to save a couple of dollars and have smaller PCB, take DB9 pin 2 and 3 straight to the PIC.
If I do not need the MAX232, would it be wise to place a resistor on RX/TX lines between DP9 and PIC? If yes, what value/size would be recommended?
Thank you,
Ron
I am hoping someone might be able to answer this.
I usually place a MAX232 chip in my designs for RS232 communication to a PC. Since Serial ports are not often found on new computers I have been using a USB to serial converter cable to communicate with a PC.
If I am using a USB to Serial converter cable is the MAX232 necessary? It would be nice to save a couple of dollars and have smaller PCB, take DB9 pin 2 and 3 straight to the PIC.
If I do not need the MAX232, would it be wise to place a resistor on RX/TX lines between DP9 and PIC? If yes, what value/size would be recommended?
Thank you,
Ron