Item Management Wireless Entry System Solution
With the improvement of people's lives and the acceleration of the pace of life, people have put forward higher requirements on the living environment, methods, and rhythm. The emergence of barcode scanners undoubtedly brings great convenience to people in many aspects, such as: Warehouse management, cashiers, records, etc., removed many people's troubles. However, traditional bar code scanners always have a line connected to the data terminal (PC), which makes the scope of the scanning gun very limited, the activities are very limited, and the number of scanners connected to a data terminal is also very limited This makes the data terminal equipment resources very wasteful, these and so on give the scanning gun a revolutionary challenge. The emergence of wireless scanners complements a series of weaknesses of traditional wired scanners.
The company developed a wireless scanning gun and its networking system based on daily needs using the company's independently developed wireless data transmission module.
There are roughly two ways that wireless scanners can communicate: one-to-one communication and one-to-many communication.
One-to-one communication One-to-one communication means that one sending end corresponds to one receiving end, and two data terminals have one-to-one correspondence. This can form multiple one-to-one communication, because the wireless module developed by our company has Autonomously seize the channel and evasive functions, so it will not involve the same frequency interference problem, because at any time only one will be sending data. Another solution is to send data to each wireless sender one by one in a polling manner (this scheme is for wireless modules that do not have autonomous preemption signals and avoidance functions).
Figure 1 shows a one-to-one wireless scanning system with only one scanner and one data receiving terminal. This solution is simple and reliable, without any communication protocol, but the system capacity is small, only suitable for small-scale applications with only one scanner.
As shown in FIG. 2 , there is a plurality of one-to-one scanning systems. The system requires the module to autonomously occupy the channel and avoidance functions, and the wireless device at the scanning end and the wireless device at the receiving end must have address correspondence to identify the source of the data and by whom. receive. Each data receiver only receives the data sent by the wireless scanner of its corresponding address. This system is more complex than the system shown in FIG. 1, but each wireless scanner and its corresponding data terminal are independent units. If a group of units fails, it will not adversely affect other units.
As shown in FIG. 3, there are a plurality of one-to-one scanning systems in a polling mode. This communication method is designed for wireless modules that do not autonomously seize channels and avoidance functions. This system is more similar to the system shown in FIG. 2. More than one polling controller, its data transmission method is the same, except that the timing of the wireless scanner transmitting data by wireless is different. The wireless system shown in FIG. 2 only needs to detect that there is no other signal with the same wireless device to send data. The device sends the stored data. The system shown in FIG. 3 is where the polling controller polls who sends the data, and does not involve the problem of occupying the channel.
Second, one-to-many communication The so-called one-to-many communication means that there are multiple wireless devices transmitting data and receiving only one receiving. This kind of system can be divided into two kinds of ways according to the functional characteristic of the wireless module, one kind is to preempt the signal to send, another kind is the receiving end polling and controlling its sending end to send, receive by one receiving end finally. As shown in Figure 4:
Third, the characteristics of wireless scanning system
1, easy to install, simple, low cost, easy to maintain
2. The data is verified with high reliability
3, driving convenient, flexible, large range of activities, not bound by the cable.
4, according to the occasion can choose the appropriate system