2 changing the i, C slave address, 3 changing the baud rate – Matrix Orbital LK204-25 Legacy User Manual
Page 21

4.1.3
Serial Communication
In addition to being able to communicate via I
2
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
2
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
2
C write address (0x00 -
0xFF).
Description
This command sets the I
2
C write address of the module between 0x00
and 0xFF. The I
2
C write address must be an even number and the read
address is automatically set to one higher. For example if the I
2
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