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IR Control Using the Flux Dongle V1 and V2 (2G Legacy Mode, Omega, and Ultra Series)

Last updated: Nov 11, 2026

Overview

The Flux Capacitor IR Dongle converts the RS232 port on a Just Add Power device into an IR blaster. Use this article to identify your dongle, configure the connected Just Add Power device, and send IR commands to a source or display.

These instructions cover V1 and V2 dongles on supported 2G Series, Omega Series, and Ultra Series devices, including compatible devices running L Series firmware in AMP 2G Legacy Mode.

Identify Your Dongle

Check the dongle's marking and status LED before selecting its setup instructions.

V1 V2
IR Dongle V1 front view without V2 marking IR Dongle V2 front view with V2 marking

IR Dongle V1

V1 has no V2 marking and no status LED.

Deprecated hardware: V1 is the legacy dongle revision. Just Add Power continues to support systems using this hardware. Use the V1 settings when maintaining an existing V1 installation.

IR Dongle V2

V2 has V2 printed on the housing and a red status LED.

Red LED Status

The illustrations below simulate the V2 status light. Flicker timing is illustrative, not a measured flash pattern.

Off Solid Red Flickering Red
Simulated V2 LED off Simulated V2 LED solid red Simulated V2 LED flickering as commands arrive
No power. Powered on. Receiving a command from the Just Add Power device.
Feature V1 V2
Serial settings 9600 baud, 8 data bits, no parity, 1 stop bit 115200 baud, 8 data bits, no parity, 1 stop bit
IR formats Pronto and Global Cache Pronto, Global Cache, and Global Cache Compressed
Status LED None Red LED for power and command activity

Requirements

These instructions are based on the latest firmware available for the applicable device and operating mode. Use L Series firmware for AMP 2G Legacy Mode or B Series firmware for normal Omega Series and Ultra Series operation.

For firmware downloads, see L Series firmware or B Series firmware for Omega and Ultra Series. For L Series hardware limits, see Understand 2G Legacy Mode Compatibility.

For either dongle revision, you also need:

  • A network path from the control system to the Just Add Power device connected to the dongle. See How to Access a Device.
  • An IR command for the source or display in a format supported by your dongle revision.

Cables and Connections

Both dongle revisions use the same supplied cable set:

  • IR emitter (3V, 0.1A).
  • 3.5mm-to-3.5mm stereo cable.
  • USB Type A to Micro USB cable.
  • Y-shaped USB power tap.

Use the connection diagram to identify the dongle's IR, serial, and power connections.

IR dongle connection diagram for V1 and V2

Set the Null Modem Jumper

Locate the null modem jumper on the bottom of the Just Add Power device. It changes the transmit and receive pin positions on the device's RS232 port. Both V1 and V2 dongles require the crossover position.

Example null modem jumper accessible through an opening on the bottom of a Just Add Power device
Example jumper location on the bottom of a Just Add Power device.

The physical jumper orientation varies by model. For Omega Series and Ultra Series devices, use the model-specific diagrams in Null Modem Jumper Pinouts for Omega & Ultra Series. For 2G Series devices, confirm the crossover position for the exact model before continuing.

Configure the Just Add Power Device

Confirm that the control system can reach the Just Add Power device connected to the dongle. For an established system that requires routing, see Setup a Static Route for an Established Just Add Power System.

Select the firmware section below, then use the command or setting for your dongle revision.

L Series Firmware

CLI

  1. Open a Telnet connection to the Just Add Power device connected to the dongle on port 23.
  2. Execute the command for your dongle revision:
    Dongle Command
    V1 flux.sh v1
    V2 flux.sh v2
  3. Reboot the Just Add Power device.

webUI Alternative for V1

  1. Open the Just Add Power device webUI.
  2. Set Serial over IP to Type 3 - CLI Access.
  3. Set Baudrate to 9600, Data bits to 8, Parity to None, and Stop bits to 1.
  4. Select Apply.
  5. Reboot the Just Add Power device.

B Series Firmware

Choose the CLI or webUI method. The Flux setting selects the serial mode and baud rate for your dongle revision.

CLI: justOS API

Execute each command individually. The justOS API is also accessible through HTTP; these instructions use the device CLI.

  1. Open a Telnet connection to the Just Add Power device connected to the dongle on port 23.
  2. Execute the command for your dongle revision:
    Dongle Command
    V1 POST /settings/flux v1
    V2 POST /settings/flux v2
  3. Save the setting: POST /command/device save.
  4. Reboot the Just Add Power device: POST /command/device reboot.
  5. After the Just Add Power device restarts, reconnect and execute GET /settings/flux. Confirm that the configured value matches your dongle: v1 or v2.

For API access details and additional startup settings, see justOS API Overview and Startup Settings.

webUI

  1. Open the Just Add Power device webUI and locate the serial settings under Endpoint Control.
  2. Select the serial mode for your dongle revision:
    Dongle Serial Mode
    V1 Flux IR Dongle (v1)
    V2 Flux IR Dongle (v2)
  3. Select Apply.
  4. Reboot the Just Add Power device.

Serial settings in the Just Add Power webUI

Send and Verify an IR Command

Use the documentation for your control system to select an IR code in a format supported by your dongle revision. Both methods below support V1 and V2 dongles after the connected Just Add Power device has been configured for the correct revision.

B Series: justOS API through the CLI

  1. Open a Telnet connection to the IP address of the Just Add Power device connected to the dongle, using port 23.
  2. Execute POST /command/flux IR_CODE, replacing IR_CODE with the Pronto or Global Cache command for the source or display.
  3. Confirm that the intended source or display performs the requested action.

Example Global Cache command executed directly in the device CLI:

POST /command/flux sendir,1:1,1,38000,1,1,127,63,16,16,16,48,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,48,16,16,16,1000

L Series or B Series: Port 4998

  1. Open a Telnet connection to the IP address of the Just Add Power device connected to the dongle, using port 4998.
  2. Send the IR command followed by a carriage return.
  3. Confirm that the intended source or display performs the requested action.

Example Global Cache command. Here, \r represents the terminating carriage return.

sendir,1:1,1,38000,1,1,127,63,16,16,16,48,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,48,16,16,16,1000\r

Confirm the result at the source or display. Feedback from the Just Add Power device and LED activity on a V2 dongle do not confirm that the controlled source or display performed the requested action.

Command Feedback

For both V1 and V2, the Just Add Power device acts as the gatekeeper: it checks command structure before forwarding the command to the dongle and provides feedback to the control system. Feedback is not returned by the dongle.

Command Documented Response
Global Cache IR code completeir,1:1,1
Incorrect Global Cache code ERR_001
Pronto IR code ERR_001
getdevices device,0,0 ETHERNET
device,1,1 IR
endlistdevices
getversion V2 example: version,1,FluxCapacitor_v2
get_NET NET,0:1,[configlock],[ipsetting],[ipaddress],[subnet],[gateway]
get_IR IR,1:1,IR