This industrial expansion board provides your for with a variety of industrial communication interfaces: 2 RS485, 1 RS232, 1 CAN FD and 1 CAN, each interface has electrical isolation protection. Onboard -protection, anti-static and other protection measures make communication and more reliable. For 5, a PCIe expansion board interface is reserved for users to further expand functions. There is also sufficient space reserved inside the shell to support users to stack and expand custom functions. Onboard integrated power isolation, no additional power supply is required at the isolation end, which can the stable output of current and voltage of RS232, RS485, CAN, and CAN FD, improve anti-interference ability, and improve impact resistance. Onboard digital isolation chip, signal isolation communication is , more stable, and more anti-interference. Product type:for isolated industrial interface expansion board Applicable motherboard:for 4B, for 5 Communication interface: SPI + UART Power supply method (choose one):5V power supply from Type-C power port of adapter board; DC7-36V wide voltage power supply from external terminal Package: Environmentally friendly plastic shell, supports rail and wall mounting. The product appearance and printed words depending on the batch, but this does not affect use. Type:B:with PCIE to M.2 adapter board Colour:As Shown Material:ABS Package Contents: 1 * Expansion Board Kit (with Case) 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.