QMS 2060, Reference

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This is an advanced version of byte mode which allows transfer of
data in either direction without returning to the compatibility mode.
The communication is a half-duplex channel with either device, the
host or the printer, making a request for data transfer when there is
available data. In the case of simultaneous requests for transfer, the
printer always defers to the host.
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Printer-host communication is done via asynchronous bidirectional
eight-bit transfer. A return to compatibility mode is not required.
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Printer-host communication is done in nibbles (four bits; one-half
byte) with the low order nibble sent first. A transfer of two nibbles is
required for each byte of information.
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Your QMS 2060 Print System supports PS Protocol, a protocol for
communication between the printer and a host computer over the
parallel, optional serial, and optional network interfaces. This binary
communications protocol (BCP) allows any 8-bit binary value (0-255)
to be treated as data, while allowing a few of the values to function as
special control characters. When communicating 8-bit binary data in
binary or binary fixed mode, the printer uses the quoting mechanism
of the binary communications protocol to distinguish between the
special control characters and print job binary data.