
To operate an external device by linking to L3 status signal output, connect the signal line to the OUT port that outputs the status to operate the external device. To activate L3 by external-device status signal, connect the external-device signal line to the IN port linked to L3 operation. The function of each IO port is as follows:

| Power | +5V Power | +5V power necessary to connect external devices |
| Output | Laser Start | Auto laser engraving start upon +5V (High) signal output from an external device |
| Output | Laser Stop | Immediate laser engraving stop upon +5V (High) signal output from an external device |
| Input | Laser ON Signal | +5V (High) signal input to an external device upon laser engraving start. |
| Input | Laser OFF Signal | +5V (High) signal input to an external device upon laser engraving end. |
| Input | Blower On/Off Signal | When the blower is ON, +5V (High) input to an external device; and, if OFF, GND (Low). |
| Power | GND | GND power necessary for external-device connection. |