🚀 go-pugleaf

HELP!

Does anyone know of a commercially available RS-485 to fiber optic
converter?  This converter (or fiber optic modem) would allow me
to extend RS-485 over the 4000 ft. limit.  By the way, RS-485 is
a specification that allows RS-422 differential signals to be used
in a multi-drop (bus) configuration.

Now I'm really dreaming!  Does anyone know of a commercially available
fiber optic RS-485 concentrator/multiplexor?  This device would allow
several RS-485 copper segments to plug into it, and it would convert
these signals into a fiber optic signal.

Thanks in advance!  By the way, is there another news group that I should
post this question to (ie: communications.protocol)?

The following pictures show what I actually want to do.

 ************
 * TERMINAL *        ********         ********        *****
 *CONTROLLER*--------*485/FO*=========*FO/485*--------*DTE*
 *  (DCE)   * RS-485 ********  Fiber  ******** RS-485 *****
 ************
 
 
 ************                         **************
 * TERMINAL *        ********         *            *
 *CONTROLLER*--------*485/FO*=========*   RS-485   *
 *  (DCE)   * RS-485 ********  Fiber  *CONCENTRATOR*
 ************                         **************
                                      |    | . . . |
				      |    |       | RS-485
				      |    |       |
				    *****  |     *****
				    *DTE*  |     *DTE*
                                    *****  |     *****
					   |
                                         *****
					 *DTE*
					 *****


-- 
John Butala      CIM Systems Integration Center, NCR CI/MEG Division - Wichita
 NCR:654-6018    <J.Butala@Wichita.NCR.COM>
 (316) 636-6018  <uunet!ncrlnk!ncrwic!j.butala>