Epson EB‑L255F User Manual page 157

Using ESC/VP21 Commands
Signal name
GND
TD
RD
Communications protocol
• Default baud rate setting: 9600 bps
• Data length: 8 bit
• Parity: None
• Stop-bit: 1 bit
• Flow control: None
Function
Signal wire ground
Transmit data
Receive data
157