Brainboxes USB to Serial converter adapters come in 1, 2, 4 and 8 ports as RS232 version.
USB to RS232 converter Baud rates from 110 to 921,600 Simple installation Works where many USB to serial converters do not Brainboxes proven software drivers, enable the serial port to behave just like a real COM port attached to the PC motherboard Robust software for excellent application compatibility Brainboxes Lifetime Warranty and Support US-101 - 1 Port (stock-no. 688-3321) US-257 - 2 Port (stock-no. 703-3243) US-701 - 4 Port (stock-no. 688-3337) US-279 - 8 Port (stock-no. 688-3334)