Datamax Allegro 2 - Manual (Page 101)

Cable Listings
Allegro2 E-3
PC (DB25P) TO PRINTER
Figure E-3 PC (DB25P) to Printer
Note: Cable is used for connection to a PC compatible with DB25P
communication ports. Flow control is either Xon/Xoff or
CTS/DTR.
PC (DB9P) TO PRINTER
Figure E-4 PC (DB9P) to Printer
Note: Cable is used for connection to a PC compatible with DB9P
communication ports. Flow control is either Xon/Xoff or
CTS/DTR.