Tring to communicate with ModSim32 Slave

Hello, I’m trying to run a first test with the RUT956 gateway device. Specifically, I am trying to use the RUT as a master to read a specific register on a virtual Modbus slave device. First, I would like to know if my connection setup is correct.

I used this configuration for RS485:

from this topic: Configuring RS485 on RUT955 - Crowd Support Forum | Teltonika Networks.

As shown in the image, I connected A+ to D+ on my Moxa device and B to D-. On the other side, I used ModSim32 to emulate my slave device, using COM1 for the USB port:

Then I configured the Modbus RTU in the server setup:

When I press the “Test” button, the message “Failed to send test request, daemon is down” appears. What am I doing wrong?

Additionally, why doesn’t it allow me to select the COM port for serial communication? Could you help me resolve these issues? Thank you for your support.

This topic was automatically closed after 15 days. New replies are no longer allowed.