Standard Mode (Start Signal Required)

Overview

In Standard Mode, the driver requires a manual start signal to enable the laser output, providing an additional layer of safety control.

Start Conditions

The driver will start when ALL of the following conditions are met:

1. ✅ Start signal is SET (manual enable)
2. ✅ Modulation voltage higher than threshold voltage (>0.2-0.3V)
3. ✅ Interlock loop closed
4. ✅ Temperature below adjusted threshold (if NTC connected)

Note

If no temperature sensor is connected, the driver will ignore the temperature conditions.

Startup Sequence

Power On
   ↓
5s Power-up Delay
   ↓
Wait for Start Signal
   ↓
Start Signal SET?
   ↓
Check Other Conditions
   ↓
All Conditions Met?
   ↓
5s Additional Delay
   ↓
Enable Laser Output

Monitored Parameters

The driver continuously monitors:

1. Interlock loop - Must remain closed
2. Temperature - Must remain below threshold

Failure Handling

Interlock Failure

When interlock loop opens:

• ❌ Laser output disabled immediately
• 🔴 Interlock LED starts flashing
• Driver remains in failure state

Recovery Procedure:

1. Close the interlock loop
2. RESET the start signal (turn OFF)
3. SET the start signal again (turn ON)
4. Wait 5 seconds → laser enabled

Temperature Failure

When temperature exceeds threshold:

• ❌ Laser output disabled immediately
• 🔴 TEMP LED starts flashing
• Driver remains in failure state

Recovery Procedure:

1. Wait for temperature to drop below hysteresis threshold
2. RESET the start signal (turn OFF)
3. SET the start signal again (turn ON)
4. Wait 5 seconds → laser enabled

Important Difference from ARM Mode

In Standard Mode, the driver will NOT automatically recover from failures. The start signal must be reset and set again, even after the fault condition is rectified.

LED Behavior During Failures

While Start Signal is SET and Failure Present:

• Interlock LED or TEMP LED continues flashing
• Fault persists until start signal is reset

After Start Signal is RESET:

• If fault is still present → LED keeps flashing
• If fault is rectified → LED stops flashing

Power Interruption Protection

If an input voltage interruption or unwanted shutdown occurs while the start signal is SET:

• ❌ Driver will NOT start automatically
• Driver stays in power-up delay mode
• 🔴 All three LEDs (Laser, Interlock, Temp) flash simultaneously

Recovery:

1. RESET the start signal
2. SET the start signal again
3. Normal operation resumes

Modulation Behavior

When modulation voltage is below threshold (0.2-0.3V):

• ✅ Laser LED is ON (driver enabled)
• 📴 Laser does NOT emit
• Laser will emit when modulation voltage rises above threshold

Activating Standard Mode

Warning

The laser will emit when the start conditions are fulfilled and the start signal is set after a five seconds power-up delay.

Activation Instructions

1. Disconnect or switch off the power supply
2. Remove the Mode jumper
3. As long as the jumper is removed, the driver will start in this mode
4. Connect or switch on the power supply

Note

The driver will only enable the laser when the start signal is set.

Standard Mode Flow

Power On → 5s Delay → Wait for Start
                         ↓
                    Start Signal SET
                         ↓
                  Check Conditions
                         ↓
                  All Conditions Met?
                    ↓         ↓
                   YES        NO
                    ↓         ↓
              5s Delay    Wait/Flash
                    ↓         ↓
              Enable Laser    │
                    ↓         │
              Monitor         │
                    ↓         │
              Failure? ←──────┘
                ↓    ↓
              YES   NO
                ↓    ↓
           Disable  Continue
           Flash LED   │
                ↓      │
        MUST RESET     │
        START SIGNAL   │
                ↓      │
           Recovery ←──┘

Advantages of Standard Mode

• ✅ Manual control - Explicit start/stop control
• ✅ Enhanced safety - Prevents automatic restart
• ✅ Deliberate operation - Requires operator intervention
• ✅ Fault acknowledgment - Operator must reset after failures

Use Cases

Standard Mode is ideal for:

• Laboratory and research applications
• Manual operation scenarios
• Applications requiring operator control
• Environments where automatic restart is undesirable
• Development and testing

Comparison with ARM Mode

Feature	Standard Mode	ARM Mode
Start Signal Required	✅ Yes	❌ No
Auto Recovery	❌ No - Manual reset required	✅ Yes - Automatic
Power Loss Recovery	❌ No - Manual restart	✅ Yes - Automatic
Safety Level	🔒 Higher - Manual control	🔓 Lower - Automatic
Best For	Lab, Development, Manual use	Production, Automated systems