Matrix-orbital LK204-25 Legacy Manual do Utilizador descarregar pdf (Página 21)

4.1.3 Serial Communication

In addition to being able to communicate via I

C the LK204-25 communicates natively through the

RS-232 protocol at at a default baud rate of 19,200 bps and is capable of standard baud rates from 9600

to 115,200 bps. Furthermore the LK204-25 is also capable of reproducing any non-standard baud rate in

between using values entered into our baud rate generation algorithm and set through command 164 (0xA4).

The display module communicates at standard voltage levels of -30V to +30V or at TTL levels of 0 to +5V

by setting the Protocol Select Jumpers to TTL.

4.2 Changing the I

C Slave Address

Syntax

Hexadecimal 0xFE 0x33 [adr]

Decimal 254 51 [adr]

ASCII 254 “3” [adr]

Parameters

Parameter Length Description

adr 1 The new I

C write address (0x00 -

0xFF).

Description This command sets the I

C write address of the module between 0x00

and 0xFF. The I

C write address must be an even number and the read

address is automatically set to one higher. For example if the I

C write

address is set to 0x50, then the read address is 0x51.

NOTE The change in address is immediate.

Remembered Always

Default 0x50

4.3 Changing the Baud Rate

Syntax

Hexadecimal 0xFE 0x39 [speed]

Decimal 254 57 [speed]

ASCII 254 “9” [speed]

Parameters

Parameter Length Description

speed 1 Hex value corresponding to a baud

rate.

Matrix Orbital LK204-25 17

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 61 62

Sem comentários

Matrix-orbital LK204-25 Legacy Manual do Utilizador Página 21