Post by thread:[EE] serial multiplexer

I am looking for a device that can connect one RS232 port (TX and RX) on an embedded processor to one of several devices with serial ports and can be controlled by a couple of I/O bits on the controller. Can this be done? Any enlightenment will be appreciated. TIA Vic ________________________________________________________ Victor Fraenckel - The Windman victorf ATSIGN windreader DOTcom KC2GUI Home of the WindReader Electronic Theodolite Read the WIND "Dost thou not know, my son, with how little wisdom the world is governed?" -Count Oxenstierna (ca 1620) to the young King Gustavus Adolphus "People sleep peacefully in their beds at night only because rough men stand ready to do violence on their behalf." -George Orwell "When a true genius appears in the world you may know him by this sign: that all the dunces are in confederacy against him." -Jonathan Swift

>I am looking for a device that can connect one RS232 port (TX and RX) >on an > embedded processor to one of several devices with serial ports and > can be > controlled by a couple of I/O bits on the controller. Can this be > done? Use multiple RS232 transceivers (either all in one IC or separate). Then use standard logic gates to route signals from processor pins to appropriate transceiver. You could use eg CD4052 (from memory) analog type multiplexer or a digital multiplexer . 2 pins for TXD/RXD and 2 pins for multiplexer control will give you 4 channels. RM

At 08:16 AM 3/5/2005, Russell McMahon wrote: >>I am looking for a device that can connect one RS232 port (TX and RX) on an >>embedded processor to one of several devices with serial ports and can be >>controlled by a couple of I/O bits on the controller. Can this be done? > >Use multiple RS232 transceivers (either all in one IC or separate). Then >use standard logic gates to route signals from processor pins to >appropriate transceiver. You could use eg CD4052 (from memory) analog type >multiplexer or a digital multiplexer . 2 pins for TXD/RXD and 2 pins for >multiplexer control will give you 4 channels. Some of the newer AVRs have four uarts.