Why max232 needed

Signal is transmitted from txd pin of microcontroller serial port. Connect this pin to your module Txd pin. This ic is very important in case when we need to make connection and transfer data between devices that works on different signal level wave forms TTL, Rsc etc. TTL vs RS signal wave form. It has two driver channels and two receiver channels. The maximum distance it can send data is 12 to 15 meters.

Max is used in modems, terminals, computers, printers, scanners, fax machine etc. Pin names with Functions. Max has 16 pins. It requires four external capacitors for its proper configuration. The highest distance it can transmit data ranges from 12 — 15 meters. So this IC is applicable in terminals, modems, computers, scanners, printers, fax machines, etc.

The following circuit is applicable for microcontrollers. The circuit can be built with the MAX IC and four exterior capacitors for producing maximum voltage internally. This IC has different clones which have similar functionality but are usually not expensive.

If the IC is not accessible, it might be feasible to utilize a usual MAX through a less voltage supply, however, the output might not be within the limits described through the standard of RS The highest suggested distance is approximately 10 meters at bps.

You need a MAX You can get these on Digikey, Adafruit, Sparkfun, etc Much simpler if you don't really need the serial cable in the first place. Level translation needs to work in both directions. Think about the inputs and outputs you are dealing with.

You may find some one off way of doing this without a RS level translator IC using discretes, but you won't accomplish this with simple resistive dividers. From the figure i can see you are using arduino uno. It has a inbuilt usb to serial converter so no need to use a rs converter just connect the arduino to your pc through its usb port.

It will be detected as a serial port in your PC I assume that you have the necessary drivers in your pc since you are burning program into the arduino with the same pc. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Is MAX is needed?