Matrix-orbital GLK12232-25-SM Manual do Utilizador descarregar pdf (Página 41)

10.1.1 I

C Interface

The keypad is read by I

C master read. In short, this means that a read of the module will always return

the ﬁrst unread key press. A read is initiated by writing to the module with its base address plus 1, then

clocking the module’s return byte after the module releases the SDA line. Much more detail on this basic

C function can be found in the I

C speciﬁcation by Phillips.

10.1.2 RS232 Interface

By default on any press of a key, the module will immediately send out the key code at the selected baud

rate. This behavior can be modiﬁed using commands found in the next section.

10.2 Auto Transmit Key Presses On

Syntax

Hexadecimal 0xFE 0x41

Decimal 254 65

ASCII 254 “A”

Description In this mode, all key presses are sent immediately to the host system

without the use of the poll keypad command. This is the default mode

on power up.

NOTE This command is not available in I

Remembered Yes

Default On

10.3 Auto Transmit Key Presses Off

Syntax

Hexadecimal 0xFE 0x4F

Decimal 254 79

ASCII 254 “O”

Description In this mode, up to 10 key presses are buffered until the unit is polled by

the host system, via the poll keypad command 254 38. Issuing this

command places the unit in polled mode.

NOTE This command is not available in I

Remembered Yes

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Matrix-orbital GLK12232-25-SM Manual do Utilizador Página 41