Dual bus serial comms (RS232 & RS485)
Dual bus serial comms (RS232 & RS485)
(OP)
Hi
I know one gets IC's that can do it in one, but they are generally expensive and sometime not normally stocked by our suppliers making for lon lead time on manuf.
I want to use MAX232 eqv. and say LTC485 to make a dual bus where the user can connect to unit via RS232 or RS485. The problem seems that the RS232 levels will damage the RS485 IC due to over-voltages ootside the absolute max ratings.
Is there an easy way to combine these / overcome the problems ?
Thanks
Beyers
I know one gets IC's that can do it in one, but they are generally expensive and sometime not normally stocked by our suppliers making for lon lead time on manuf.
I want to use MAX232 eqv. and say LTC485 to make a dual bus where the user can connect to unit via RS232 or RS485. The problem seems that the RS232 levels will damage the RS485 IC due to over-voltages ootside the absolute max ratings.
Is there an easy way to combine these / overcome the problems ?
Thanks
Beyers





RE: Dual bus serial comms (RS232 & RS485)
Explain further what you really want. Do you want a single connector that the user plugs into that can be either RS-232 or RS-485, or what is it that you want the user to do?
RE: Dual bus serial comms (RS232 & RS485)
PS. I the mails that was deleted(?), I have given an outline of what possible solutions are (which is more expensive) and how I am doing it now with jumpers (which is cheaper but not under software control or automatic, which is what I want). If anybody is interested in this, let me know and I will repost the sollutions.
RE: Dual bus serial comms (RS232 & RS485)
RE: Dual bus serial comms (RS232 & RS485)
RE: Dual bus serial comms (RS232 & RS485)
This is one of the reasons why the USB specification spends so much energy on verifying that the 4 supported connector types cannot be erroneously inserted the wrong way or into an incompatible connector.
TTFN