Serial data device needed

I am searching for a circuit diagram for a device that I can build. I need this device to divide serial data while amplifying the signal so that both outputs are equal to the input.

I need this because I have a serial device that is providing a one-way data flow into the serial port on my computer. I want to be able to split this signal and put it into two ports. Simply running the data in parallel to both com ports doesn't work because I believe that too much signal is being lost.

Can anyone offer suggestions?


Reply to
Thomas Abell
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Is the data at TTL levels? Is so, get a hex inverter IC (7404 seies, IIRC). Put the input stream into one inverter, connect its output to the inputs of two other inverters. The outputs of those inverters are what you want. Since there are six inverters in the package, and you just used three of them, you can buffer two data lines per package.



Thomas Abell wrote:

Reply to
Bill Jeffrey

Sorry for the earlier post. The serial port is RS-232, which is not directly TTL-compatible. Though there are several versions of RS-232, I believe the common one uses +12VDC and -12VDC to represent the two logic states. To buffer this, you will need a +/- 12VDC supply, and a couple transistors and a couple resistors for each of the lines to be buffered. Same principle as the inverter IC, but implemented with discrete transistors.



Bill Jeffrey wrote:

Reply to
Bill Jeffrey

On Thu, 7 Apr 2005 13:49:14 -0500, "Thomas Abell" put finger to keyboard and composed:

You *should* be able to drive two RS232 inputs from one output. If not, then you could buffer the output with an MC1489 quad line receiver and use this to drive an MC1488 quad line driver. Alternatively, to avoid the need for additional +/-12V supplies, you could use a single +5V Maxim IC with on-chip charge pumps.

- Franc Zabkar

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Reply to
Franc Zabkar

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