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Serial To Parallel Converter(MAX232)

2016-01-17 22:05  
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This article briefly describes the Serial To Parallel Converter (MAX232). This principle is easy to understand, but also very practical. Depth understanding of circuit elements, can be more effective to grasp this principle. Do you know the circuit, you can see and purchase these components: MAX232 .

This converter may help if just the serial port on a personal computer is free, whereas the printer needs a parallel (Centronics) port. It converts a serial 2400 baud signal into a parallel signal. The TxD line, pin 3,CTSline, pin 8 and theDSRline, pin 6, of the serial port are used – see diagram. TheCTSandDSRsignals enable handshaking to be implemented. Since the computer needs real RS232 levels, an adaptation fromTTLto RS232 is provided in the converter by a MAX232. This is an integrated level converter that transforms the single 5V supply into a symmetrical ±12V one.

Figure:1 Serial To Parallel Converter

Figure 1 Serial To Parallel Converter

The serial-to-parallel conversion is effected by IC1. This is essentially a programmedPICcontroller that produces a Centronics compatible signal from a 2400 baud serial signal (eight data bits, no parity, one stop bit). The IC also generates the requisite control signals. If there is a delay on the Centronics port, the RS232 bitstream from the computer may be stopped via the Flow signal (pin 17). This ensures that no data is lost. The controller needs a 4 MHz ceramic resonator, X1.




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