5.7-inch QVGA STN panel for compact machine interfaces
The GT1055-QSBD is a 5.7-inch STN color LCD HMI from Mitsubishi's GOT1000 series, running QVGA resolution at 320 × 240 dots. The 256-color palette is adequate for status screens and alarm pages but falls short of the 65K-color TFT panels in the GOT2000 line — expect blockier gradients on process graphics. The cold cathode (CCFL) backlight carries a 5-year life at 25°C ambient and is not user-replaceable. When the display dims or flickers, the entire GOT body must be swapped — plan a replacement window around year 4 in a climate-controlled cabinet, sooner if the panel sees sustained 50°C vertical mounting.
Serial connectivity for legacy PLC links
One RS-232 channel on a D-sub 9-pin male connector handles short-distance programming and PLC links up to 15 m at baud rates from 4800 to 115200 bps. The RS-422 port on a D-sub 9-pin female extends that reach to 1200 m for remote I/O or multi-drop configurations — the HMI can talk to a Mitsubishi FX or Q-series PLC on one port while logging to a printer on the other. A USB Mini-B device port provides Full-Speed 12 Mbps transfer for project downloads from GT Designer3. This is the primary method for screen uploads on a laptop — the serial ports are typically reserved for runtime PLC communications, not commissioning.
Mature lifecycle — sourcing through independent channels
The GT1055-QSBD carries a mature lifecycle status. Mitsubishi has moved focus to the GOT2000 series for new designs, but this HMI remains orderable through independent distribution for existing machine builds and MRO swaps. No official successor order code is published — the GOT2000 equivalent requires a different project file and panel cutout. The 128 KB SRAM holds clock data, alarm history, recipe data, and time-action set values backed by a GT11-50 BAT lithium battery. The battery is field-replaceable; the CCFL backlight is not. Factor both into the preventive maintenance schedule for installed units.
Panel cutout and environmental limits
Operating temperature range is 0 to 55°C in horizontal mounting, derated to 0 to 50°C when mounted vertically. Pollution degree 2 (non-conductive dust only) and 2000 m elevation limit apply — no oil mist, corrosive gas, or direct sunlight. The self-cooling design means no fan to fail, but the enclosure must allow natural convection around the rear case.