Datamax H Class Operator's Manual page 15

Parallel Connection: The parallel interface supports directional communications. Choose and
connect your cabling as follows:
•
For unidirectional communication, use a Centronics IEEE 1284 cable with a 36-pin male
connector.
•
For bidirectional communication, use an IEEE 1284 Compliant cable with a 36-pin male
connector (and supporting host software).
Serial Connection: The serial interface supports RS-232C, RS-422, and RS-485
communications via a DB-9 connector (click here for details). Serial interface cabling must
make specific connections (pin-outs) for proper data exchange between the host and printer
(see note below). The different pin-outs and part numbers are shown below (contact your
reseller for ordering information).
In addition to the hardware configuration, the serial port settings must match the host
computer's serial port settings. Refer to the Communications branch of the menu to make
these settings. Basic connections are shown:
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