Datamax Allegro 2 Operator's Manual page 102

Cable Listings
Parallel to Serial Adapter (Part Number: 899516)
If the Printer is being set up for parallel to serial communications a
special Parallel to Serial Interface Adapter is needed, (Figure E-5).
The Parallel to Serial Interface Adapter is designed specifically for
use with your Label Printers. The adapter is a one-way
communication self-powered device. No external power source is
required.
The adapter has a sophisticated microprocessor built into the head
assembly that converts standard Centronics parallel to RS-232 serial
communication. This cable is useful when using the Printer with a
PC that has only a parallel Printer port available.
Figure E-5 Centronics Parallel Interface Converter
Cable is used for connection to a PC compatible with DB25M
parallel communication ports. Flow control is CTS/DTR only. Part
Number: 899516.
E-4 Allegro2