RS232 buffer

[TDY]

I am trying to find an RS232 buffer IC. I can only find the level shifters from TTL to RS232 but not one that is able to receive RS232 and spit RS232 as well. Pretty much a repeater.

I am trying to MUX 2 serial ports (all 9 pins) with the least parts. One of the serial ports has TTL outputs going thru an RS232 inverter, and the other is a normal RS232 serial port. Both are going to single RS232 port.

:idea: Any ideas anyone?

Tdy

 

[evandude]

if you take your RS232 input, convert that to TTL, then you can mux the two TTL serial signals and convert the output back to RS232.

with a normal MAX232 you get two TX and two RX, so you could implement both conversions in one chip, then you'd just have to handle the TTL mux.

 

[TDY]

Thanks evandude,

I did that, I used a Sipex SP213EHCA to conver the RS232 to TTL and then link together the two TTL signals and spit them out through another Sipex. :lol:

But I thought that there could be a better solution than having to shift the level twice to gain acces to an "enable" line for the RS232 lines.

Any other Ideas?

 

[jkmadsci]

Maybe you could use a pic chip to gather both signals and send out
all the data.