> I have some PIC controlled LED displays that I send data to via RS232.
> I'm sending data at 9600,8,n,1.  I'm only using the gnd and transmit
> from the PC with no handshaking.
>
> Each display is located about 15 feet apart.
>
> Can I just chain the devices together by tying the input TTL converted
> RS232 (receive in) to the output (transmit in) and on to the next device?
> Kind like a repeater?

Yes.  Loading rules allow multiple TTL inputs on each TTL output.
I don't think the MAX203's receiver output would have any problem
driving both the PIC input pin and the MAX203 transmitter input pin.

> OR like above only read and regenerate the bits with the PIC.  I.e. PIC
> recieve from 203, PIC send back through the 203 to the next device.  Also
> kinda like a repeater.

Why bother injecting software when a centimeter of wire will do?

> OR
>
> Will a "Y" cable work?

Yes, within reason.  Given the distance between transmitter and
the multitude of receivers, I'd go with regeneration and a daisy
chain arrangement.  That way you could also use a standard cable
between all of the display units.
                                                Lee Jones