Check whether AC adapter or batteries have been correctly installed.

LCD - low power consumption and long battery life.

Light Emitting Diode (LED) and Vacuum Fluorescent Display (VFD) display types are recommended for indoor applications, identifiable by digits that light up over a dark background. For most applications in sunlight, we suggest a Liquid Crystal Display (LCD), which is identifiable by black digits over a gray (or backlit) background.

To make the scale more accurate.

Calibrating equipment requires chains and other hardware, so the re-zero is built in to allow you to shift the span back to a true zero after the calibration process.

Typically, bench scales up to about 600 lbs in capacity will use one single-point load cell. This can vary depending on platform size, capacity, application, etc.

Since the box weight is less than 20d.

Because of sensitivity to noise, RS232 is not recommended for applications requiring more than 50 feet of travel.

In this case 1200 baud. In general, slower baud rates will travel greater distances.

Always use the minimum amount of filtering necessary for a stable reading. Exceeding that will slow your updating speed and ultimately compromise accuracy and performance.

Baud rate, Data bits, and parity.

This is a means of communication that both transmits and receives information (two way).

East High scale which equipped with USB or RS232 interface can input its own unit ID, you can identify the data from different ID.

No, the scale can only work with RS232 printer, since the USB port on the scale indicator is a virtual RS232 interface, not a standard real USB port.

A continuous variable voltage (0-10V) or current (4-20ma) output that tracks the weight applied to the scale. Analog outputs are commonly used to communicate with a PLC.

-To convert an analog signal (like the signal from a load cell) to a digital signal that can be displayed as a value.

Running a load cell cable over longer distance and exposing it to severe temperature change can impact the resistance within the cable and ultimately the accuracy of the scale. Therefore, sense lines are used to help the A/D monitor exactly how much excitation voltage is at the load cell and maintain accuracy for the entire system.

These are two types of interference. Electro Magnetic Interference (EMI) comes from industrial type equipment with large coils or motors. Radio Frequency Interference (RFI) comes from transmitting devices such as radios and cell phones.

Handbook 44 separates weighing devices into five accuracy classes according to number and value of scale divisions--I, II, III, IIIL, and IIII with class I having the highest precision. Class III implies all commercial (Legal-for-Trade) weighing devices including grain-test scales, jewelry scales, animal scales, postal scales, and laundry scales. A produce scale would be one type of class III application, while truck scales fall under class IIIL, high-precision jewelry scales Class II, and precision laboratory weighing Class I.

National Type Evaluation Program (NTEP) certification allows a weighing device to be used for commercial and Legal-for-Trade applications, implying that it is capable of meeting standards put forth in the NIST Handbook 44.

A device classified as IP68 is dust tight and protects against water while submerged beyond 1m in depth.
IP68 is the highest grade of waterproof.