Posted 27 Nov 2017 hello, Maybe somebody know how need send only hex numbers via rs232 in the external device? I tried to use SEND_RECV_MSG function block, but unsuccessful, because send ASCII code. Need send 16#AE number, but I don't have any idea how need do it. I am waiting your advice. Share this post Link to post Share on other sites
Posted 28 Nov 2017 (edited) try and just use the send function block and once done the receive....just a thought. Also you can convert dec to hex, hex to string etc just as you like in the plc. Its all binary in the end. Length of message might be an issue but unless knowing what device or model you are using I cannot be sure. Ps. the physical interface is the most important. if that isnt right you will not get any communication. Edited 28 Nov 2017 by cHud Share this post Link to post Share on other sites