Posted 15 Dec 2019 Hi Im hoping someone can help me out! i have a PLC SLC 5/03 and i want to connect the DB9 port with DH485 protocol to a computer 100 fts from there, is there any problem with the distance? and what kind of cable should i use , i already connected with my laptop with a USB-serial with a null modem cable RS232 (i did the cable by my self) but for the distance i cannot keep using that protocol so what is the recommendation? Share this post Link to post Share on other sites
Posted 15 Dec 2019 The limitation of RS-232 is 50 ft. Doesn't matter which protocol you run across it whether it be DF1 or DH485. You're still limited to 50 ft without repeaters Share this post Link to post Share on other sites
Posted 16 Dec 2019 22 minutes ago, TWControls said: The limitation of RS-232 is 50 ft. Doesn't matter which protocol you run across it whether it be DF1 or DH485. You're still limited to 50 ft without repeaters so the 4000 ft the i tought is not for the protocol, they are for the port RS-485 wich uses DH485 protocol to comunicate, and my only option with out repeaters is use that port right? Share this post Link to post Share on other sites