Features For RTU Protocol: Supporting for RTU protocol as well as for 03 read instruction and for 06 or 16 write instruction, satisfying your work needs. Multiple Address: 1-247, default 1. By modifying the 485 address, a maximum of 247 modules can be cascaded. Over 32, please use RS485 repeaters. Clear in Display: The 4 digit 0.56in LED display module can clearly display numbers, ASCII characters, letters, floating point numbers and more. Other Functions: The brightness is adjustable, also has electronic label function, and you can set the initial display content after start up. Easy to Install: Comes with a compact size and a light weight, the RS485 interface display module is very convenient to install within minutes. Specification: Item Type: LED Display Module Working Voltage: DC 5-28V Working Current: 4.3~42mA, related to the brightness of LED tube.  Supporting Protocol: For RTU protocol, for 03 read instruction and for 06 or 16 write instruction.  LED Tube Color: Red LED Tube Position: 4 digit 0.56in.  Communication Interface: RS485 Supported Baud Rate: 1200, 2400, 4800, 9600 default, 19200, 38400, 57600, 115200.  Parity Check: No Check, even check, or odd check.  Package List: 1 x LED Display Module Package List 1 x LED Display Module