Hello, I have just purchased a SLC 5/01 second hand. Unfortunately my background is Electrical & Instrumentation & have never really messed around in the comms. area. Therefore I am after the best( & least expensive ) way to communicate with the SLC 5/01. It has a DH 485 port & thats it, I have looked at the AB Web site & they mention a DH-485/RS-232c interface module.(1747-KE) Is this the correct way to go as my distance between the PC & PLC is approx. 30 meters & I believe that RS-232 is only good for approx. 15 meters. I have also read that because I only have one PLC that I will not need the 1747-AIC link coupler, is this correct? Im also not sure if its best to use the serial port on my PC or the modem. If you decide to answer my simple questions maybe you could start with a basic outline of DH-485 & RS-232. Thanks Heaps!! If you any approx. prices on equipment I may need ( Cards,Cables etc ) it would also be appreciated.( Im from Down Under, Australia ) CHEERS!!