Matrix-orbital LK402-25 Manual do Utilizador descarregar pdf (Página 22)

Commands

1. Communications

1.1. Changing the I2C

Slave Address

Dec

Hex

ASCII

254 51

FE 33

■ 3

Address

Immediately changes the I2C write address. Only even values are permitted as the next odd address will become

the read address. Default is 80.

Address

1 byte, even value

1.2. Changing the

Baud Rate

Dec

Hex

ASCII

254 57

FE 39

■ 9

Speed

Immediately changes the baud rate. Not available in I2C. Baud rate can be temporarily forced to 19200 by a

manual override. Default is 19200.

Speed

1 byte, valid settings shown below

Table 20: Accepted Baud Rate Values

Rate

1200

2400

4800

9600

19200

28800

38400

57600

115200

Speed

207

103

1.3. Setting a Non-Standard

Baud Rate

Dec

Hex

254 164

FE A4

Speed

Immediately changes the baud rate to a non-standard value. Speed must be a whole number between 977 and

153800. Due to rounding, error increases with baud rate, actual baud must be within 3% of desired baud to ensure

accurate communication. Not available in I2C. Can be temporarily forced to 19200 by a manual override.

Speed

2 bytes, calculations shown below, standard crystal speed is 16MHz

Equation 1: Speed Byte Calculation

Equation 2: Actual Baud Rate Calculation

Equation 3: Baud Rate Error Calculation

1.4. Transmission

Protocol Select

Dec

Hex

254 160

FE A0

Protocol

Selects the protocol used for data transmission from the display. Data transmission to the display is not affected.

Must be set to the protocol in use to receive data correctly.

Protocol

1 byte, 1 for Serial (RS232/RS422/TTL/USB) or 0 for I2C

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 42 43

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