Do we need MAX232/ADM3203 for UART communication with PIC32MX795F512L

Question

I am trying to communicate UART with PIC32MX795F512L. I am really confused with this thing that we should use MAX232/ADM3202 or pins will directly commnicate. Because in some microcontroller, it is not required but in others it is required. Please help.

Thanks

You have not told us about the other device that is supposed to communicate with the PIC. Is it a computer with a built-in RS232 interface or some kind of USB virtual serial device? — Christoph, Jul 15 '15 at 07:57
Also see this question: http://electronics.stackexchange.com/questions/44571/does-pic-require-max232-for-uart — Christoph, Jul 15 '15 at 07:58
If it has to communicate with PC,use of RS232 level shifter is must — Sanjeev Kumar, Jul 15 '15 at 08:17
thanks @SanjeevKumar I just want to know that RS232 and ADM3202 both are same.? — anna carolina, Jul 15 '15 at 08:18
RS232 is an interface where ADM3202 is an IC which full fils the requirement of RS232 interface — Sanjeev Kumar, Jul 15 '15 at 08:25
related thread: [Difference between UART and RS232?](http://electronics.stackexchange.com/q/110478/7036) — Nick Alexeev, Jul 18 '15 at 04:14

score 0 · Accepted Answer · answered Jul 15 '15 at 08:40

0

Yes, you will need to have MAX232 or ADM3203 along with allied components for making your microcontroller communicate with a computer over UART/USART Serial interface.

RS232 is a standard and defines the signal level requirements at transmitter and receiver. Therefore to make it compatible with the TTL output, an interface (coverter) component is required which shall convert the TTL logic to RS232 standard and vice versa. MAX232 does that for you.

answered Jul 15 '15 at 08:40

WedaPashi

1,670
17
29

Many motherboard rs232 can work with TTL logic levels these days. The signal may need to be inverted, but this can be done at the microcontroller level. A full tranceiver is often not required. – Scott Seidman Jul 15 '15 at 10:33
@ScottSeidman: Yes, true. But at the basic level, people will assert that you need one. – WedaPashi Oct 15 '15 at 12:10

score 0 · Answer 2 · answered Jul 15 '15 at 10:28

If you are using UART to communicate with another controller with same logic levels, you don't need max232 ic.

RS232 is a standard that also has specifications on logic levels.Your PC can understand only RS232 logic levels while your controller controller communicates in TTL logic. To bridge this, you need MAX232 ic.

Do we need MAX232/ADM3203 for UART communication with PIC32MX795F512L

2 Answers2