Devantech

Devantech USB to I2C Interface Adapter
Devantech self-powered USB to RS485 adapter with support for baud rates up to 250kbps, automatic bus turn-around, and buses up to 128 devices.
$20.50

Devantech USB to UART, I2C, SPI, serial adapter (USB-ISS)
Devantech self-powered USB to RS485 adapter with support for baud rates up to 250kbps, automatic bus turn-around, and buses up to 128 devices.
$20.50

Devantech USB to RS485 Adapter
Devantech self-powered USB to RS485 adapter with support for baud rates up to 250kbps, automatic bus turn-around, and buses up to 128 devices.
$20.50