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From: Jim Thompson on 11 Apr 2010 20:49
On Sun, 11 Apr 2010 19:41:55 -0500, "eeboy"
<jason(a)n_o_s_p_a_m.n_o_s_p_a_m.jasonorsborn.com> wrote:

>>
>>Do the remote devices transmit whenever they wish, or only on request
>>from your microcontroller?
>>
>
>Fortunately these two are only on request which is why I have chosen to
>multiplex these two.
>
>---------------------------------------
>Posted through http://www.Electronics-Related.com

Aren't we talking CMOS logic levels? Why not some kind of bus
transceiver that can tri-state the undesired channel?

...Jim Thompson
--
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From: Paul Keinanen on 12 Apr 2010 00:32
On Sun, 11 Apr 2010 17:35:40 -0500, "eeboy"
<jason(a)n_o_s_p_a_m.n_o_s_p_a_m.jasonorsborn.com> wrote:

>
>One thing I may not have been clear on. The communications from the UART
>peripheral of the micro is simply logic level asynchronous serial
>consisting of an RX and TX signal. No handshaking, no RS-232 voltage
>levels.

In that case a 3.3 V single open collector chip with four 2 input OR
gates that are 5 V tolerant should be sufficient. If the UART can be
configured to use opposite polarity, an open collector-NAND chip would
also suffice.

From: Jan Panteltje on 12 Apr 2010 06:47
On a sunny day (Sun, 11 Apr 2010 17:35:40 -0500) it happened "eeboy"
<jason(a)n_o_s_p_a_m.n_o_s_p_a_m.jasonorsborn.com> wrote in
<GO2dnY_PN4Eh01_WnZ2dnUVZ_t2dnZ2d(a)giganews.com>:

>One thing I may not have been clear on. The communications from the UARTperipheral of the micro is simply logic level
>asynchronous serialconsisting of an RX and TX signal. No handshaking, no RS-232 voltagelevels.

One or more 74HC4053

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