Thank you Carl. David -----Original Message----- From: Carl Denk To: Microcontroller discussion list - Public. Sent: Fri, May 24, 2013 9:31 am Subject: Re: [EE]: Allen-Bradley DH+ Interface Try Triplc.com. Their PLC's interface with some of the AB PLC's. It=20 could be in the hardware manual for some of the higher end PLC's, or the=20 Trilogi IDE manual which does both ladder logic and a version of Basic=20 within the ladder rung outputs. A place to look is the end of line=20 sequence with line feed and carriage returns. I have some of their=20 MD100's on a RS-485 > fiber optic > PIC 18F1320 On 5/24/13 9:41 AM, David Strumpf wrote: > Does anyone have a known / reliable interface for Allen-Bradley's Data Hi= ghway=20 Plus or Remote I/O Serial Interface? I have a Two Wire RS-485 application = today=20 that I am trying to port over the design to Drive a Two Wire bus to DH+ and= RIO. =20 I believe that the differential amplitude is higher than RS-485 and the=20 interface is transformer coupled but I do not know the preferred interface= =20 circuitry. > > Any help would be appreciated. > > Thanks, > David > > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist =20 --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .