We are having issues in turning line around in sending a response to a RS485 message. We see our device responding too slowing and dropping off a mast/slave network. Time is on the order of >30mS. Need to be able to respond in < 2 mS. When there is a network of ‘just us’, it is okay. When installed with other vendor equipment it has a problem. Our observation is the timing on the out going messages.
Is there a FIFO buffer enabled on the VF50 for UART2? What we see could be explained by that. I refer to VFXXXRM.pdf, page 2669 or about. Is there some other FIFO mechanism in place? UART2 is used for the RS485 comm link.