« Close

Datasheets and User Guides

App Notes

Software & Driver


8.0 LEDs

STATUS - green LED

The status LED indicates when the T-Series device is performing autonomous tasks, such as running a Lua script or streaming. The LED will blink when a script accesses a modbus register or when a stream packet is prepared.

The status LED also activates during firmware updates to indicate various stages of the process, refer to the Combined LED Activity section.

COMM - yellow LED

The primary indicator for packet transfer.  If the T-Series device is communicating the COMM LED will be blinking.  A few blinks after connecting to the PC indicates that the device is enumerating.  Enumeration is when the standard USB initialization takes place, and the host is gathering device information.  

The COMM LED will blink when the T-Series device receives Modbus commands, or when streaming data.  Each packet will produce a single blink.  If commands are issued rapidly, the LED will blink rapidly.  At high packet transfer rates the LED will blink at 10Hz, even though more than 10 packets are being processed per second.

Normal Power-Up Behavior

  1. Both LEDs blink rapidly for about 1 second.
  2. COMM solid off and STATUS solid on.
  3. If USB enumerates, COMM blinks a few times and then stays solid on.

Combined LED Activity

When the LEDs blink together, the device is computing checksums.

When the LEDs are alternating, the device is copying a firmware image.

Register Listing

T4 FW version 1.0002 does not currently support these registers but this functionality can be implemented on customer request.

LED Config Registers
Name Start Address Type Access
- Address: 48006
Sets the LED operation: 0 = Off. Useful for lower power applications. 1 = normal. 2 = Lower power, LEDs will still blink but will normally be off. 3 = Reserved. 4 = Manual, in this mode the LEDs can be user controlled.
  • Data type: UINT16  (type index = 0)
  • Readable and writable
  • T7:
  • T4:
- Address: 48056
The ON/OFF state of the LEDs after a power-cycle to the device.
  • Data type: UINT16  (type index = 0)
  • Readable and writable
  • T7:
  • T4: