Datamax I-class series Operator's Manual page 101

7.3 Serial Cable Requirements
Wiring diagrams, suggested applications, and part numbers for serial interface cables are
given in the table below. (Contact a reseller for ordering information.)
Null Modem (MXM)
Part Number 556000
For connection to other DCE equipment.
Flow control is only Xon/Xoff.
"PC" (DB25P) to Printer
Part Number 556002
For connection to a PC compatible with
DB25 communication ports, flow control can
be either Xon/Xoff or CTS/DTR.
I-Class
Applicable Serial Interface Cables
For connection to a PC compatible with
DB9P communication ports. Flow control can
be either Xon/Xoff or CTS/DTR.
Optional equipment, diagram only provided
for reference.
"PC" (DB9P) to Printer
Part Number 556001
RS-422 Connection
Part Number N/A