The Allen-Bradley 2706-F21J is a PanelView DataLiner DL50 message display. It displays messages in red with 1 or 2 lines of text and 20 or 40 characters measuring 2.1 inches for two-line text and 4.8 inches for one-line text. Messages can be viewed from as far away as 240 feet, making it ideal for use in large spaces like warehouses. It also has a display size of 8.8 x 7.6 inches, adjustable brightness, and an ASCII input type. It also comes with two communication ports, namely an RS-485 port and an RS-232 port. The 2706-F21J has a NEMA Type 12 or 13 enclosure rating and has a 7 degrees tilted window with anti-glare. The display has fault isolation LEDs available, but no memory.

Scrolling messages are possible with this display, allowing users to compose lengthy messages. Users can also choose flash messages if they have short texts to display. It also comes with an alarm relay, optional display modes, fault isolation LEDs, and easy DIP switch configuration. The 2706-F21J display operates in three modes, bootstrap mode, diagnostic mode, and slave mode. The 2706-F21J has an input voltage that ranges from 85 to 264 Volts AC at 47 to 63 Hertz and a maximum input power of 45 VA at 85 Volts AC. The display also has a 3 Amps at 240 Volts AC resistive load annunciation relay. The 2706-F21J’s operating temperature is 32 to 140 degrees Fahrenheit, its non-operating temperature is -40 to 185 degrees Fahrenheit, and its relative humidity is 5 to 95% non-condensing. Its operating shock is 15 g and its non-operating shock is 30 g. The 2706-F21J’s operating vibration of 1 g and a non-operating vibration of 2.5 g.