Posted 30 Apr 2018 Hello, PLC: NX1P Comm module: NX-CIF105 I am running a serial (RS485) network to control several motors. As a trigger for to read the serial port I am using the ( Ch1 Receive Data Exist) bit, which is an internal bit that's ideally should be energized when there's data in the Receive buffer. However, this bit isn't reliable at all. I am reaching out today to figure out if there's another way to trigger the receive command ( preferably without a delay) thank you all Cheers! Share this post Link to post Share on other sites