Matrix-orbital DD-DB1 LCD/VFD Dev Board Instrukcja Użytkownika Pobierz pdf (Strona 19)

Commands

1. Communications

1.1.Changing the I2C

Slave Address

Dec

Hex

ASCII

254 51

FE 33

3 ■

Address

Immediately changes the I

C write address.

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. Can be temporarily forced to 19200 with manual override.

Speed 1 byte, valid settings shown below

Rate 1200 2400 4800 9600 19200 28800 38400 57600

Speed 83 41 207 103 51 34 25 16

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. Range is 977 to 153800. Speed must be a whole number.

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

communication. Baud rate can be temporarily forced to 19200 by a manual override.

Speed 2 byte, calculations shown below

Speed =

CrystalSpeed

8× DesiredBaud 

−1

ActualBaud =

CrystalSpeed

8× Spee d 1

∣DesiredBaud − ActualBaud∣

DesiredBaud

0.03

1.4.Transmission

Protocol Select

Dec

Hex

254 160

FE A0

Protocol

Selects the protocol used for data transmission to the host. Data transmission from the host is not affected. Must be set

to the protocol in use to receive data correctly.

Protocol 1 byte, 1 for Serial (RS232/TTL/USB) or 0 for I

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 46 47

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