The Focussz Fosc21 is a USB-based, 2-channel oscilloscope with an analog bandwidth of 3kHz and a sampling rate of 8kHz (1 channel) / 4kHz (2 channels). The manufacturer improperly calls this device an oscilloscope: It can only measure voltages from 0-5V, and thus cannot measure negative voltages.
See Focussz Fosc21/Info for more details (such as lsusb -v output) about the device.
- Main chip: ST STM8S103 (marking: "STM8S103-K3T6C 990XB F6 MYS 136")
- USB interface: Prolific PL-2303HX (marking: "PL-2303HX LE10193A")
- Crystals: 12.000 and 22.1184
The USB connector is a PL2303 USB serial adapter. The port settings are 115200, 8n1.
The protocol is currently being analyzed. This section will be updated with details at a later time.
For more details see User_talk:Mrnuke#Focussz_Fosc21_Protocol.