Features MULTIPLE USAGES: The host (computer, industrial computer, PLC, touch screen, etc.) can send commands through the RS485 bus to control the display content of the display. AUTOMATIC IDENTIFICATION: Support ASCII text and RTU dual protocol automatic recognition, no need for user settings, easy to operate. EASY INSTALLATION: The device panel only needs to open square hole to be embedded, no screws are required, and the installation is convenient. HIGH EFFICIENCY: Switching power supply circuit, wide input voltage range and high conversion efficiency, can work continuously for a long time. CIRCUIT PROTECTION: Industrial grade RS485 chip, with surge, static prevent, over voltage and over current protection, power input reverse connection protection. Specification: Item Type: Digital Tube Display Product Model: LED-054S Display Digits: 4 digits Digital Tube Size: 0.56in Shell Size: Width: Approx. 60mm / 2.4in Height: Approx. 29mm / 1.1in Depth: Approx. 22mm / 0.9in Hole Size: Width: Approx. 58mm / 2.3in Height: Approx. 27mm / 1.1in Power Supply Voltage: DC 5-36V Interface Terminal Number: XH2.54-4P Pin Definition: + refers to the power positive pole, - refers to the power negative pole A/T: RS485 Bus A/TTL TXD B/R: RS485 B/TTL RXD Serial Port Parameters: Baud Rate: 1200bps, 2400bps, 4800bps, 9600bps (factory default), 19200bps, 38400bps, 57600bps.115200bps Start Digit: 1 digit Stop Digit: 1 digit (factory default), 2 digit, 1.5 digit Data Digit: 8 Parity: No parity (factory default), odd parity, even parity Communication Protocol: Supports automatic identification of ASCII text and RTU dual protocol, no user setting is required Package List:1 x Digital Tube Display1 x Cable Note:This product is 4 digit RS485 port, supports automatic identification of ASCII text and RTU dual protocol, no user settings are required. Package List 1 x Digital Tube Display 1 x Cable