Totinfo Barcode Reader Illumination LED Control Guide
1. Scope
This document describes how to configure and control the illumination LED behavior of Totinfo barcode readers, including configuration barcodes, permanent and temporary parameter commands, and recommended real-time host-control commands.
2. Illumination Modes
| Mode | Parameter Value | Behavior | Typical Use |
| On During Read (Default) | 0x00 | The illumination LED is enabled only during scanning and remains off when the scanner is idle. | General-purpose scanning with balanced power consumption and lighting behavior. |
| Always On | 0x01 | The illumination LED remains on continuously, regardless of whether decoding is in progress. | Applications requiring constant illumination in a fixed scanning area. |
| Always Off | 0x02 | The illumination LED remains off at all times. | Applications using external illumination or requiring the scanner light to stay disabled by default. |
3. Configuration Barcodes
Scan the corresponding configuration barcode to set the illumination mode.
| Configuration Item | Barcode Data | Parameter Value | Configuration Barcode |
| On During Read (Default) | 3030020 | 0x00 |  |
| Always On | 3030021 | 0x01 |  |
| Always Off | 3030022 | 0x02 |  |
4. Parameter Commands
4.1 Permanent Commands
Permanent commands are saved to FLASH and remain effective after power-off and restart.
| Mode | Command |
| On During Read | 08 C6 04 08 00 F2 03 00 FE 31 |
| Always On | 08 C6 04 08 00 F2 03 01 FE 30 |
| Always Off | 08 C6 04 08 00 F2 03 02 FE 2F |
4.2 Temporary Commands
Temporary commands are saved to RAM only and remain valid for the current power cycle. The setting is not retained after power-off.
| Mode | Command |
| On During Read | 08 C6 04 00 00 F2 03 00 FE 39 |
| Always On | 08 C6 04 00 00 F2 03 01 FE 38 |
| Always Off | 08 C6 04 00 00 F2 03 02 FE 37 |
5. Real-Time Host Control
When the host needs to switch the illumination LED on and off in real time, do not frequently use the Always On / Always Off parameter-setting commands. Instead, configure the scanner to a suitable default power-on state and then use the dedicated LED control commands below.
| Recommended Step | Action |
| Step 1 | Configure the scanner to Always Off or Always On as the default power-on state according to the application requirement. |
| Step 2 | Use the dedicated LED ON / LED OFF control commands for real-time toggling. |
| Real-Time Function | Command | Description |
| LED OFF | 05 E8 04 00 01 FF 0E | Turns off the illumination LED through host-side control. |
| LED ON | 05 E7 04 00 01 FF 0F | Turns on the illumination LED through host-side control. |
6. Engineering Notes
- Use permanent commands when the required illumination behavior must be retained after power cycling.
- Use temporary commands during engineering tests or when the host application configures the scanner at each startup.
- For high-frequency light switching controlled by the host, use the dedicated LED ON / LED OFF commands instead of repeatedly writing parameter settings to FLASH.