I have a card set that does this using relays. Its buss-oriented -=20 the first card has one port for the computer and 5 ports for=20 machines. Each additional card adds 6 ports for machines. Switching=20 is done with momentary push-button switches with LED indication for=20 the active port. The RS-232 connections are done with RJ-45 connectors and handles all=20 of the standard RS-232 signals except for Ring Indicator. That is:=20 tx, rx, cts, rts, dtr, dsr. Its been a LONG time since I last looked=20 at this project (we made only a few of them) but I *think* that the=20 RJ-45 pinout was done to an early Cisco scheme where the port could=20 be changed from terminal to modem just by flipping the cable around=20 before crimping into the RJ-45 plug. I'm not sure how many cards we still have available but I could=20 certainly add some to our next PCB order. I can send schematics and layout if you desire. dwayne At 05:13 AM 11/29/2012, Henrique Ribeiro de Oliveira wrote: >Hello > >We have 6 CNC lathes here that use RS232 to download/upload programs into >the server. >I was planning on making a RS232 Switch Box and leave all the machines >connected. > >Searching on the google I found a Analog Switch that can handle +-15V. >(DG211) > >Datasheet - http://www.datasheetcatalog.org/datasheet/intersil/fn3118.pd= f > > >The CNC RS232 is on a DB25 port that has 13 wires but it can be simplified >to a DB9. I'm not sure how many I/Os I need, on the worst case is 8. >So 2 x DG211 for each machine and maybe a microcontroler to control >everything. > > >Tryed to find a cheap version of it but all models that I found does not >have enough ports. > >Anyone already did something like this before? Can be done like that? > > >Thanks, > >Henrique >-- >http://www.piclist.com PIC/SX FAQ & list archive >View/change your membership options at >http://mailman.mit.edu/mailman/listinfo/piclist --=20 Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax www.trinity-electronics.com Custom Electronics Design and Manufacturing --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .