Schematic Usb To Serial Converter
The USB_RS232 cables are a family of USB to RS232 levels serial UART converter cables incorporating FTDI s FT232RQ USB to serial UART interface IC device.
When communicating with various micro processors one needs to convert the RS232 levels down to lower levels, typically 3.3 or 5.0 Volts.
Here is a cheap and simple way to do that.
Serial RS-232 V.24 communication works with voltages -15V to 15V for high and low. On the other hand, TTL logic operates between 0V and 5V. Modern low power consumption logic operates in the range of 0V and 3.3V or even lower.
RS-232
TTL
Logic
-15V Â -3V
2V 5V
High
3V 15V
0V 0.8VÂ
Low
Thus the RS-232 signal levels are far too high TTL electronics, and the negative RS-232 voltage for high can t be handled at all by computer logic. To receive serial data from an RS-232 interface the voltage has to be reduced. Also the low and high voltage level has to be inverted.
This level converter uses a Max232 and five capacitors. The max232 is quite cheap less than 5 dollars or if youre lucky you can get a free sample from Maxim.
The MAX232 from Maxim was the first IC which in one package contains the necessary drivers and receivers to adapt the RS-232 signal voltage levels to TTL logic. It became popular, because it just needs one voltage 5V or 3.3V and generates the necessary RS-232 voltage levels.
The requred parts:
1 x female serial port connector
1 x max 232
4 x 1uF capacitor
1 x 10uF capacitor
Soldering iron, wires, breadboard etc.
Schematic.
This is simple, it doesn t need any further explanations. You can use it at any project that might need it. Here is the schematic. RS232 serial to USB converter.
Pinouts.ru Convert one interface to another cables schemes listing Pinout of RS232 serial to USB converter cable schematic and layout of 4 pin USB A / USB B.
14 March, 2008Mike
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This is simple, it doesn t need any further explanations. You can use it at any project that might need it. Here is the schematic. via
RS232 serial to USB converter cable schematic – Link
RELATED POSTS2 March, 2008 USB to serial converter10 May, 2008 USB to Serial RS232 Adapter6 June, 2011 3in1 converter – USB to RS232, RS485, UART8 June, 2011 Flat cable to header converter adapters
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94 comments to MAX232 Serial level converter Comment by Accessing serial console on the Fon : SoDoItYourself.com: Monday, February 26th 2007 at pm.
Copyright 2010 Future Technology Devices International Limited 1 Document Reference No.: FT_000054 TTL-232R TTL TO USB SERIAL CONVERTER RANGE OF CABLES Datasheet.
Other things to consider would be compatibility with Windows 10. The manufacturer FTDI of the processor chips for our USB to Serial adapter Ultimate and PRO.
Sun keyboard to USB converter. Note that a newer version has been released. This page still contains all relevant background info though. See page 2 for a more in.
