Datamax Allegro 2 Operator's Manual page 101

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