Non-polar 485 communication circuit

• Main Author: HANXI,JIANG LU
• Format: Patent
• Language: English
• Published: 14.03.2007
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

The utility model relates to a non-polar 485 communication circuit including a communication circuit with 485U1 chip at whose both ends 485 U2 chips is parallel connected, wherein the 485U2 chip is crossed connected with two poles A, B of the 485 bus of the 485U1 chip, and the power control circuit provides working power for the 485U1 chip or 485U2 chip via audions. When the two poles of the 485 bus is positively connected, the 485U1 chip will working to allow the 485 communication between the equipments; when the two poles is inverted connected, the communication equipment will determine communication codes to form correct 485 polarity state, then the control terminal KZ of the power control circuit provides electrical level, and the audions provides the 485U2 chip with working power as well as cut off the working power of the 485U1 chip, so as to allow the 485 communication between the equipments. The utility model has simple structure, good reliability, and is practical and convenient.