Difference between revisions of "Focussz Fosc21"

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The [http://www.focussz.com/eshowProDetail.asp?ProID=1482 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.
The [http://www.focussz.com/eshowProDetail.asp?ProID=1482 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 -vvv''' output) about the device.
See [[Focussz Fosc21/Info]] for more details (such as '''lsusb -v''' output) about the device.


== Hardware ==
== Hardware ==
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== Protocol ==
== Protocol ==


The USB connector is nothing more than a PL2303 USB serial adapter. The port settings are the following:
The USB connector is a PL2303 USB serial adapter. The port settings are 115200, 8n1.
115200,8n1


The host sends a 6-byte packet:
The protocol is currently being analyzed. This section will be updated with details at a later time.
ff 05 61 7d 06 73
With the device responding
ff 0b 9b e6 80 1a 11 20 64 32 03 04


The first byte seems to be 0xff, indicating start of packet, with the second byte indicating the packet length (minus the first byte)
For more details see [[User_talk:Mrnuke#Focussz_Fosc21_Protocol]].
 
TODO.


== Resources ==
== Resources ==

Latest revision as of 15:01, 23 November 2014

Focussz Fosc21

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.

Hardware

  • 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

Photos

Protocol

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.

Resources