SIIG (ID-SC0U11-S1) 8-Port Industrial grade USB to RS-232 Serial Adapter with 15KV ESD & power input surge protection per port, wall & DIN rail-mount equipped Compliant with USB 2.0 specification and backward compatible with USB 1.1 Supports serial port data transfer rate up to 921.6Kb/s Separate 128-byte / 384-byte FIFO buffers for each port. 15KV ESD protection for RS-232 ports Redundant 9 to 24VDC power input. Power input surge protection (600W) for each port Rugged metal construction and dual mount options ensures reliable performance in a variety of applications