Remote-processing CAMBASIC Manual de usuario descargar pdf (Pagina 150)

Commands - 117

SOUND

COMMAND

SYNTAX: SOUND frequency

SOUND

PURPOSE: Gener ates a squar e wave signal at frequency.

REMARK S: frequency is from about 8 Hz to about 60 KHZ, depending upon the system

Using SOUND with out any parameters turns it off.

The frequency argum ent is used in a C PU tim er. For the RPC -150 and RPC-2300, the clock is

230.4 KHz. F or the RPC-2350 it is 460.8 KHz. If frequency is an exact multiple of this number,

the output will be accurate.

For any frequency, the actual frequency is calculated as follows. An example frequency of 1000Hz

on the RPC-2350 is used.

1 Internal clock (230. 4 KHz or 468. 8 KHz) / desire fr equency = ratio

468800 / 1000 = 468.8

2 Round the ratio (468.8 becomes 469)

3 Actual frequency is determined.

Internal clock / ratio = Actual frequency

468800 / 469 = 999.6

NOTE: The RPC-2350 uses the same timer as SOUND for RS-485 communications. You

cannot use RS-485 at the same time as SOUND.

RELATED: none

EXAMPLE: 10 SOUND 1000

ERROR: < Data neg> - if frequency is < 0

No error occurs when frequency > 65,535, but output is not cor rect.

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Remote-processing CAMBASIC Manual de usuario Pagina 150