Using SP3232, SP3485, stable performance, reaching industrial-grade design standards. The module realizes the conversion between 232 signals and RS485 or RS422 signals. The onboard automatic transceiver conversion circuit does not require "transmit-receive" control, making the communication between the two ends of the interface faster and more stable. Using standard DB9 and 5.08mm plug-in terminals, plug-in and unplugging are smooth, sturdy and reliable. The circuit is only powered by 5V.When the module is working, the power supply voltage must be connected to the 485 or 422 end.With power isolation and signal isolation circuits. The onboard digital isolator has excellent performance characteristics and reliability, can isolate signals, and make the transmitted signal more stable. The onboard DC or DC power supply isolation can provide stable isolation voltage and output short-circuit protection, and no additional power supply is required for the isolation end. The 232 end has overcurrent protection and surge protection functions. It can stable output of current and voltage and strong impact resistance. The RS485 or 422 terminal is equipped with overcurrent protection, surge protection, and anti-thunder gas discharge protection circuits. The onboard (transient voltage suppressor) can effectively suppress surge voltage and transient spike voltage in the circuit to protect the rear circuit and equipment. The onboard self-recovery fuse can stable output of current and voltage, prevent overcurrent, overvoltage and electrostatic discharge, and has strong impact resistance. The onboard gas discharge tube can use the discharge tube to discharge the strong anti-thunder current into the ground, so that the subsequent circuits and equipment are not damaged by surge impact. Colour:black Material:Metal style:DST24P-AA Due to different batches, there may be differences in product appearance and printed text, which not affect use Package Contents: 1 x Converter Kit(Random color and appearance of accessories, don' accept the specified color and appearance) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.