QMS 1060, User Manual

Page: 161 / 311

PS Protocol
Option
5-31 Additional Technical Information
EPP (Enhanced Parallel Port)
Printer-host communication is done via asynchronous bidirectional
eight-bit transfer. A return to compatibility mode is not required.
Nibble Mode
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.
PS Protocol Option
Your QMS 1060 Print System supports a new protocol for communi-
cation between the printer and a host computer over a LocalTalk,
serial, parallel, or optional interface connection. This new protocol is
called PS protocol. 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.