1. Overview
This document describes the general operation of the Smart Label Printer and the interface
between the printer and a host computer system. Smart Label Printer is a generic name
for a family of printer models, including:
• 300dpi wide printers (SLP 440 and SLP 450)
• 203dpi wide printers (SLP 200, SLP 240, SLP 420, and SLP 430)
• 203dpi narrow printers (SLP 100 and SLP 410)
2. Description
The Smart Label Printer is a bitmapped device that prints all information on the label
(including text) as graphic images. The command set is very lean in order to allow the
printer to concentrate only on printing and off-load the other functions to the host.
3. Interface
The Smart Label Printer communicates with the host computer using an RS-232 or USB
cable. The supplied RS-232 cable connects the GND, TX, RX, RTS and CTS signals to
the printer via a standard RJ-11 modular connector. The host end of the cable is intended
for connections using a DB-9 connector. At power-up, the printer’s RS-232
communications port is normally configured for no parity, 8 data bits, and one stop bit.
The maximum baud rate for the SLP 100, SLP 200, SLP 240, SLP 410, SLP 420 and SLP
430 models is 57,600 baud. Also, the maximum baud rate for the SLP 440 and SLP 450
models will be 115k baud, but it is 38,400 baud temporary.
For USB operation, a standard USB cable may be used instead of the RS-232 cable. The
supplied USB cable connects USB signals (Vbus, GND, D+, and D-) to the printer via a
standard USB series B connector. The host end of the cable is intended for connections
using a standard USB series A connector.
The host may change the baud rate to other values by sending a special command to the
printer. However, the data format is always 8 data bits, one stop bit, and no parity. The
printer’s port is always set to the default baud rate after power-up and after receiving a
reset command.
The primary communication flow is from the host to the Smart Label Printer. This is
because the host must send commands and data, while the Smart Label Printer sends only
handshaking signals and an occasional status byte.
The Smart Label Printer sends a status byte (unsolicited) to the host computer whenever
there is a change in its internal copy of the status byte. A status byte can also be requested
by sending the CMD_STATUS command to the Smart Label Printer. Since the status
byte is sent automatically whenever it changes, the CMD_STATUS command is rarely
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