07-17-2019 08:15 AM - edited 07-17-2019 08:17 AM
Hi,
I'm trying to implement communication between cRIO-9035 and Kinco FD422S servo controller. I tested communication from PC using NI OPC server with USB - RS485 converter and everything works OK. The problem is in implementing communication from real-time target cRIO-9035.
I tried using LabView Modbus API from Real-Time Module as well as Modbus I/O Server and also unofficial MODBUS Library for LabVIEW. In all cases I wasn't succesfull. I hooked up an oscilloscope and find out strange distorted frames. Please advise me what could be the reason for that?
I wired RxD- with TxD- togehter as well as RxD+ with TxD+ on both ends of cable. I tried connecting and disconnecting grounds.
With Slave connected to cRIO RS-485 port:
With Slave disconnected from cRIO
My RT vi is like that:
09-17-2020 01:17 PM
Hello,
I encounter the same problem, have you fixed it to the end?
Thanks!