How to Configure Interface of RMX-400x With LAN, USB or RS232

Updated Jan 14, 2020

Reported In

Hardware

  • RMX-4000
  • RMX-4002
  • RMX-4003
  • RMX-4004
  • RMX-4005
  • RMX-4006

Driver

  • RMX-400x Electronic Load Driver for LabVIEW

Issue Details

  • Which communication interfaces are supported by the RMX-400x DC electronic loads and the NI-developed LabVIEW driver API?
  • How can I configure the interface of RMX-400x?

Solution

In addition to the physical knobs and buttons on the mainframe, the series supports programmatic control over USB, RS-232, and Ethernet(LAN). Please follow the below steps to configure the interface.
 

RS232 Connection

When using RS232, you need to set several parameters. These include baud rate, stop bit, and parity. When setting RS232 parameters, ensure that they match those of the host machine.
To configure RS232 interface at the panel manually, please follow the below:
  1. Press the Shift key and then the Help key to access the Utility menu.
  2. Press F3 (Interface menu).
  3. If the Interface mode is not RS232, turn the selector knob to RS232.
  4. Choose RS232.
  5. Press the ENTER key or selector knob to confirm.
  6. The RS232 menu appears.
  7. Use the selector knob to edit Baud rate, Stop Bit, and Parity.
 

 
  1. Please use National Instruments Measurement & Automation Explorer (MAX) at host PC to test the RS232 functionality. For guidance, please refer to this link. Connecting Instruments via Serial 


USB Connection

Among the three interface options, USB is the easiest to use.
To configure USB interface at the panel manually, please follow the below:
  1. Press the Shift key and then the Help key to access the Utility menu.
  2. Press F3 (Interface menu).
  3. If the Interface mode is not USB, turn the selector knob to USB.
  4. Choose USB.
  5. Press the ENTER key or selector knob to confirm.
  6. The Interface becomes USB.
  7. Connect the USB cable to the USB-B slave port on the rear.
  1. If the PC asks for the USB driver, select RMX4000.inf. You can download this file at NI RMX-400x Loads 1.0 download.
  2. Please use National Instruments Measurement & Automation Explorer (MAX) at host PC to test the USB functionality. For guidance, please refer to this link. Connecting Instruments via USB


Ethernet Connection

When using Ethernet, you need to set several parameters including DHCP On/Off, IP AddressSubnet Mask, and Gateway. When setting Ethernet parameters, ensure they match the network parameters.
  1. Connect an Ethernet cable from the network to the rear panel Ethernet port. You will see the LED indicator next to the Ethernet port turn on.
  2. Power on the RMX-4000.
  3. Press the Shift key and then the Help key to access the Utility menu.
  4. Press F3 (Interface menu).
  5. If the Interface mode is not Ethernet, use the Selector knob to edit Interface.
  6. Choose Ethernet.
  7. Press the Selector knob to confirm.
  8. The Ethernet menu appears. Use the Selector knob to edit the DHCP, IP Address, Subnet Mask, and Gateway settings.

Note: If the DHCP is set to ON, the network DHCP server configures the IP Address, Subnet Mask, and Gateway settings automatically. These settings appear after the RMX-4000 gets the information by DHCP. If the DHCP is set to OFF, make sure the IP address, Subnet Mask, and Gateway settings match those of the network. 

  1. Please use National Instruments Measurement & Automation Explorer (MAX) at host PC to test the Ethernet(LAN) functionality. For guidance, please refer to this link. How to Connect to a Device in NI MAX via Ethernet/LAN

Additional Information

If you are getting trouble to connect the RMX-400x even though you followed the above steps. Please reset the device to factory configuration. Please refer to the Recall Factory/User's Defaults of the RMX-400x Series User Manual. The steps are described on page 307 of RMX-400x Series User Manual and Specifications.

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