I am trying to establish an RS-485 connection between a laptop and a device. I have attached pictures for reference. Picture 1564 and 1565 show the setup and device. The device is a three wire 485+, 485- and GND. The literature states it is a half duplex device (indicated by only 3 wires?). Pictures 1566, 1567 and 1568 show the laptop/PC configuration. The PC recognizes the converter on COM port 4 and the software seems to as well. Picture 485-2 shows the document from NI indicting cabling requirements for 2-wire (half duplex?) communication. I have confirmed the cable pinout and matched all NI software configurations for COM4 port with the same settings found in the device configuration settings. I still have been unsuccessful in establishing this connection. I feel a little stupid that I cannot see what is the problem. Can anyone identify what I am missing. I would really appreciate some insight.
↧