Brother HL-5450DN Technical Reference Guide

CHAPTER 5 PJL - 57
7. STATUS READBACK COMMANDS
7.1. Introduction
Applications can request, by sending a PJL command to the printer, information such as the configuration
and status of the printer. The printer can be programmed to send back this information when requested and
also can send back voluntarily unsolicited information of its status such as cover open, off-line state, toner
empty, displayed prompt message on the LCD and other necessary information.
PJL Status Readback will help you to program the application to appropriately set the printer settings.
In this chapter, you can learn how to use PJL Status Readback in programming an application. The
following Status Readback Commands are described :
 INQUIRE ... requests the information of the specified PJL Default setting (PJL Current Environment) set by
@PJL SET or @PJL RESET command
 DINQUIRE ... requests the information of the specified User Default setting (User Default Environment) set
by @PJL DEFAULT or @PJL INITIALIZE command or control panel
 ECHO ... request the printer to send back to the host computer a comment for the purpose of
synchronization with each other in order to start communication
 INFO ... requests a specified category of information from the printer
 USTATUS ... gives the printer permission to send back unsolicited information.
 USTATUSOFF ... turns off all unsolicited status information set by USTATUS
Job Recovery is also described in this chapter.
7.1.1. Synchronization with the printer
The printer sends the status responses to the same I/O port as it received the request from. Therefore, in a
shared or network environment, if the I/O port was used by another user and the printer is still processing the
previous job, the printer may send a response of the status of the previous user's job against the request from
the current application. In order to make sure that an application can receive correct responses for its
request, it must synchronize itself with the printer by sending the ECHO command so as to be assured that
the printer is ready for communication to you.
7.1.2. Basic format of status readback responses
The printer sends its status information to the host computer in the following format :
 starts with the @PJL prefix
 ends with a <FF> character
 All the data is in a readable ASCII format.
Each line in the PJL status responses is in the following format :
 starts with a specific keyword
 ends with <CR><LF>
For example, the readback response against the @PJL DINQUIRE is :
@PJL DINQUIRE [LPARM : personality] variable<CR><LF>
value<CR><LF>
<FF>
The application must read all the data between the @PJL and <CR><LF> codes. If the application can not
understand the meaning of the lines, it must ignore them. Future printers may send currently unused
keywords.
Refer to each command description to learn about the format of responses from the printer.

Brother HL-5450DN Specifications

General

Color	No
N-up printing	2, 4, 9, 16, 25
Duplex printing	Yes
Print technology	Laser
Maximum resolution	2400 x 600 DPI
Time to first page (black, normal)	8.5 s
Print speed (black, normal quality, A4/US Letter)	38 ppm
Duplex print speed (black, normal quality, A4/US Letter)	9 ppm
Maximum duty cycle	- pages per month
Recommended duty cycle	1000 - 3500 pages per month
Number of print cartridges	1
Memory type	DDR2
Processor family	Star Sapphire
Maximum internal memory	320 MB
Sound power level (standby)	34 dB
Sound pressure level (printing)	59 dB
Sound pressure level (quiet mode)	54 dB
Total input capacity	250 sheets
Total output capacity	150 sheets
Maximum input capacity	800 sheets
Total number of input trays	2
Multi-Purpose tray input capacity	50 sheets
Custom media width	76.2 - 215.9 mm
Maximum print size	216 x 356 mm
Custom media length	127 - 355.6 mm
Paper tray media types	Plain paper, Recycled paper
Paper tray media weight	60 - 105 g/m²
Non-ISO print media sizes	Letter
ISO A-series sizes (A0...A9)	A4, A5, A6
ISO B-series sizes (B0...B9)	B5, B6
Multi-purpose tray media types	Bond paper, Envelopes, Heavyweight paper, Labels, Plain paper, Recycled paper
Maximum ISO A-series paper size	A4
Multi-Purpose Tray media weight	60 - 163 g/m²
Standard interfaces	Ethernet, USB 2.0
USB 2.0 ports quantity	USB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.
AC input voltage	220 - 240 V
AC input frequency	50 - 60 Hz
Power consumption (off)	0.41 W
Power consumption (standby)	4.7 W
Power consumption (printing)	665 W
Power consumption (PowerSave)	0.6 W
Package weight	11.900 g
Sustainability certificates	ENERGY STAR

Weight and Dimensions

Dimensions (WxDxH)	371 x 384 x 245 mm