LEDM overview
The low-end data model (LEDM) provides one consistent data representation method and defines the
dynamic and capabilities tickets shared between clients and devices, as well as the access protocol, event,
security, and discovery methods.
ACL overview
The advanced control language (ACL) is a language that supports product control and firmware downloads in
printers that support both PJL/PCL and host-based printing. Each sequence of ACL commands must be
preceded by a unified exit command (UEL) and an @PJL ENTER LANGUAGE=ACL command. The ACL sequence
is always followed by a UEL. Any number of commands can be placed between the UELs. The only exception
to these rules is the download command. If a firmware download is done, the download command must be
the last command in the sequence. It will not be followed by a UEL.
The firmware searches for the UEL sequence when parsing commands. However, while downloading binary
data such as host-based code or NVRAM data the firmware suspends UEL parsing. To handle hosts that
“disappear” during binary sequences, the firmware times out all ACL command sessions. If a timeout occurs
during a non-download command sequence, it is treated as the receipt of a UEL. If a timeout occurs during
firmware download the product resets.
PML
The printer management language (PML) allows remote configuration and status monitoring through the I/O
ports.
Control panel
The formatter sends and receives product status and command data to and from a touch-screen control
panel.
NFC
(Wireless bundles only) This product supports near field communication (NFC) capabilities. NFC enables an
easy one-to-one HP wireless direct print connection using a simple device-to-device touch. Mobile device
users can quickly connect to the printer and print documents and images from a mobile device, such as a
smartphone or tablet, by touching the device to the NFC icon on the bottom of the control panel.
6 Chapter 1 Theory of operation ENWW
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