The power supply supports a wide DC8-28V input voltage range and features overcurrent and reverse polarity protection. Supports communication between one RS485 master device and one or more RS485 slave devices. Data from the master interface can be sent simultaneously to all slave interfaces, and data from the slave interface can be sent to the master interface in a time-sharing manner. The signal interface is protected against static electricity, -strikes, and surges. Data Interface: -485 Baud Rate: 300-230400 bps, supports custom baud rates Operating Voltage: DC 9-40V Protection Level: Industrial EMC Level 3 Isolation Voltage: 1.5kV Electrostatic Protection Level: Contact 4kV, Air 8kV Pulse Surge: Differential Mode 1kV, Common Mode 2kV Operating Temperature and Humidity: -40-85℃, 5%-95% (non-condensing) Extension Channels: 2 -485 Interface Standard: 5.08mm copper pin connector (The product printed words depending on the batch, but this does not affect use) Color:As Shown Material:plastic Package Contents: 1 * 1 to 2 Way RS485 Relay 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.