Epson GT-6500 EN - Manual (Page 164)

Serial Interface Specifications
Interface type: RS-232C(D) compatible
Transfer method: Asynchronous
Transfer speed: Scanner model dependent
Data format: Scanner model dependent
Handshaking: ACK/NAK codes software
handshaking
Signal voltage: Logic ‘‘1’’, MARK = -3V to -27V
Logic ‘‘0’’, SPACE = 3V to 27V
Connector type: DB-25 (D-sub 25-pin).
DB-295A-J4 (JAE)
Connector pin arrangement:
seri_f
A-2 Interface Specifications