automatic detect RS232/485 circuit??

abz123 · New User Joined: 06 Apr 2011 Posts: 1

Hi, does anyone know of a circuit or device that will automatically detect what type of signal (RS232 or RS485) on the line and convert it to RS232.

This is needed to put in to a comms controler for a pan and tilt unit where the user will change between RS232 and RS485 and only two lines are used. The device needs to auto detect and pass through (if rs232) or convert to RS232 (if rs485). No jumpers to set etc, has to be fully automatic.

Guest · **Oct 19, 2011 2:30 pm**

Data General used to have compiant terminals. The signalling that determined what standard was to be used was coded on the DB25 connector attached to the line terminal in the form of shorting links. Of course that was designed to switch the terminal and either a similar compliant terminal was required on the other end or a standard terminal using the correct electrical protocol.