HP LaserJet 6P - Page 123

The LAP and LMP layers can reside in either firmware, software,
or a combination of both. There are different LAP and LMP
protocols for primary and secondary devices.
The HP LaserJet 5P/5MP and 6P/6MP printers have the complete
secondary protocol, and any host trying to communicate via the
infrared (IR) port must have the complete primary protocol installed.
The primary protocol software is the responsibility of the host supplier.
It is not provided by Hewlett-Packard Company with the printer.
IrDA communications can be obtained either via an internal IR
port or an external IR accessory. Several manufacturers offer
complete accessory upgrades for both host and peripheral devices.
Protocol Serializer
IR Chip
Application
GDI DDI
Ptr DVR
IRLMP
IRLAP
IR Physical
Transmitter
Receiver
Receiver
Transmitter
IR Physical
IRLAP
IRLMP
I/O Buffer
Formatter
Data Packets & Queries
Responses
secondary
device
primary
device
ASCII Data
Windows
System
Standard Windows
LJ Printer Driver (SW)
IR Redirector
(Software)
IR Driver Packetizes
Data (SW or FW)
ASCII to
Raster Data
ASCII
Data Buffer
Unpacks Data
Checks Packets
Protocol
Deserializer
IR Chip
Figure 8. IR Data Flow.
HP LaserJet 5P/5MP, 6P/6MP Printer Service Supplement
New Product Features
20