The communication converter is mainly used for data transmission between terminal equipment such as access control controllers and consumer POS machines and computers. So, what is a communication converter? How are communication converters classified?

Introduction to Communication Converter

The main function of the communication converter is to convert the RS485 signal into the RS232 signal that the computer equipment can accept, so that the communication distance between the PC and the controller can be extended to 1200 meters. USB20D is mainly composed of RS232/RS485 level conversion chip , baud rate detection device, RS485 transceiver chip, power supply and power drive chip at the output end of RS485 transceiver chip. In order to improve the drive capability of the converter, a power drive chip is added to the output end of the RS485 transceiver chip, thus overcoming the power consumption of the unit load and exerting an ideal load capacity. The drive capability of the converter to the standard load is increased from 128 to 1024. The driving capacity for large-capacity loads has been increased from 10 to 40. Therefore, a serial communication converter with high driving capability, smaller volume and simpler structure than common serial converters is provided. A remote communication converter, including RS232/RS485 level conversion chip, baud rate detection device, RS485 transceiver chip, power supply, is characterized in that the output end of the RS485 transceiver chip in the converter has a power drive chip.

Communication converter classification

a, 485 converter

The computer can communicate with any device on the 485 bus through the 485 converter, that is, it can carry out network control of multiple devices. According to the chip selection and design of RS485 converters and RS485 devices, theoretically one bus can connect 32 sets, 64 sets, 128 sets, and 256 sets of 485 devices, and the actual number is one-third of the theoretical value, which is the most stable.

1. TCP/IP converter
2. Point-to-point communication mode: In this mode, converters are used in pairs, one as a server and one as a client, and a connection is established between the two to realize bidirectional transparent transmission of data. This mode is suitable for transforming the bus connection between two serial devices into a TCP/IP network connection.
3. Use virtual serial port communication mode: In this mode, one or more converters establish a connection with a computer to realize two-way transparent transmission of data. The following converters are managed by the virtual serial port software on the computer, so that one virtual serial port corresponds to multiple converters, and N virtual serial ports correspond to M converters (N<=M). This mode is suitable for serial devices connected by 485 bus or 232 devices controlled by computer.
4. Network-based communication mode: In this mode, the application program on the computer writes a communication program based on the SOCKET protocol, and you can directly choose to support the SOCKET protocol in the converter settings.