Expandable Serial Port Multiplexer
The Expandable Serial Port Multiplexer project allows a single RS232 serial port to service multiple instruments requiring RS232 ports. Each port is configurable in terms of baud rate, parity, number of bits and number of stop. On the host side the serial streams could be multiplexed through the use of a Windows driver or a special DLL program.
The Multiplexer uses a master processor (ATmega8) connected to a PC through a serial port. Multiple slaves (ATmega162) connect to master, via a parallel bus, to provide two serial ports each. Multiplexed commands sent to the master are routed to the appropriate slave. Likewise slave-received signals are routed back, through the master, to the PC in a multiplexed stream.
Gene Breniman, project designer, said that in addition to the slave serial port cards, other devices could be built and added to the stack to provide other services of interest to system integrators. Both A/D and D/A functional blocks could be added (based on the same ATMEL parts), to provide analog processing.
Serial Port Multiplexer
Download Project Documentation (zip)
circuitcellar.com
Related posts:
- Virtual Serial Port Software
- Serial Port IR Receiver Using AVR
- Four-Channel PWM Controller, ATmega16L
- Multi Sensor Thermometer
- Simple Parallel Port Logic Analyzer
arduino serial port multiplexer, avr to serial, COM port multiplexer, project on serial card STREAMS driver
