pass through rs232

I am considering the AX3500 for a project, but I have a question about the interface.
I understand the unit can use a RS232, but does the RS232 stop there?, let me explain, need a dual motor speed controller , but also some other things like a RS232 relay board for other functions, does the AX3500 have pass through RS232?

<P style="MARGIN: 0px">I am not quite sure what you mean about pass through rs232 but I don't believe you will be able to share a serial port with another device.
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<P style="MARGIN: 0px">For one thing, the controller uses 7 bit + even parity (for safety reasons). So unless you board can operate in that mode, this would be another obstacle.
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<P style="MARGIN: 0px">If it can, then there may be some posibilities using the fact that the controllers echoes to its output, all visible ascii characters it received. But then you have to make sure that there cannot be any conflict with the controller's command set and our board's
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Thanks for the reply Cosma, I think I figured out how to accomplish my requirements without the rs232. I looked at the Roboteq/Via rover project, then looked further into the VIA part, the computer has additional USB ports and I found a source for USB relay boards, not to pricey either.