1、The interface is compatible with EIA / TIA RS‑232C, RS‑485 / RS‑422 standards, so choosing a compatible interface is a prerequisite for use. 2、Electrical interface classification, RS‑232C interface DB9 female connector, RS‑485 / RS‑422 interface DB9 female and RJ4 3、The connector is equipped with a 6 position terminal block, and the transmission speed is fast, its transmission speed can attain 300‑112Kbps. 4、There are certain requirements for the use environment, you need to be in an environment of 0 ℃ to 50℃ e it. 5、Note, this product must be able to work with a power supply, and supports US voltage 100 to 240V. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store