This LCD module uses the Hitachi HD44780 controller IC.
Following are the pin-out for the Hyundai HC24401-B 24 by 4 Character Module:
| Pin Number | Name | Description |
| 1 | VSS | Ground Connection |
| 2 | VCC | +5VDC |
| 3 | VC | Contrast Control Voltage, to be specified |
| 4 | RS | Mode Control Pin |
| 5 | R/W | IO Control |
| 6 | nc | |
| 7 | E | IO Contol |
| 8 | D0 | Data Bit 0 |
| 9 | D1 | Data Bit 1 |
| 10 | D2 | Data Bit 2 |
| 11 | D3 | Data Bit 3 |
| 12 | D4 | Data Bit 4 |
| 13 | D5 | Data Bit 5 |
| 14 | D6 | Data Bit 6 |
| 15 | D7 | Data Bit 7 |
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