Table of Contents

1. Device Drivers
   1. Overview
2. 1. Beeper
3. DIO
   1. Digital I/O
   2. DIO Events
      1. About
      2. The Code
   3. DIO Counting
      1. Description
      2. Example
4. Display
   1. Fonts
5. Network
   1. Network File System (NFS)
   2. Weight Server -- Network Access
   3. Network Programming
      1. 825 TCP/IP Server Example
      2. 825 TCP/IP Client Example
   4. Send E-mail from 825
   5. FTP
   6. Batch file to upload a file from a PC to an 825 using the 825 web …
   7. Batch file to download a file from an 825 to a PC using the 825 web …
6. Serial Ports
   1. Using Serial Ports for Linux Shell
   2. Generic Serial Port Use
7. USB Support
   1. 825 USB A Ports (2)
      1. USB Mass Storage
         1. Accessing USB storage from a program
      2. USB Keyboards
      3. USB Printing
         1. Compatible USB Printers
      4. USB Hubs
   2. 825 USB B Port (1)
      1. USB to PC communications
8. Weighing
   1. Get Weight
      1. Command prompt testing
      2. Access the weight data from a program

Beeper

The beeper device /dev/cardbeep accepts formatted strings containing various notes to play. The following notes are supported:

Note	Octave	Frequency (Hz)
C	5	523.25
D	5	587.33
E	5	659.26
F	5	698.46
G	5	783.99
A	5	880
B	5	987.77
C	6	1046.5
E	6	1318.5
G	6	1568
A	6	1760
C	7	2093
D	7	2349.3
E	7	2637

A string can be formatted to send to the device in the format:

<duration><note><octave>
 * duration
  * 1 – 8, note = 1/duration
   * 1 = whole (1/1) note
   * 4 = quarter (1/4) note
   * 8 = eighth (1/8) note
 * note - letter from above table
 * octave - number from above table

Commas are used to separate note information, for example:

4A5,8E6

Plays a 1/4 note A in octave five then a 1/8 note E in octave 6.

The default octave may be set by:

O<octave>

Example:

O5,A,B,C

Sets the default octave to 5 then plays note A, B, and C.

The tempo may be set by:

T<tempo>

tempo must be three characters numeric

Example:

T100,A,B

Sets the tempo to 100 then plays note A and B.

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