Matrix Orbital GLK24064-25 Legacy - Manual (Page 16)

Power/Data Connector
=
[
Pin 2 Rx \ SCL (I 2 C clock)
Pin 3 Tx \ SDA (I 2 C data)
x
[
Pin 2 Tx \ SDA (I 2 C data)
Pin 3 Rx \ SCL (I 2 C clock)
Figure 18: Legacy Data Connector Jumpers
2.6 Protocol Select Jumpers
The Protocol Select Jumpers, pictured below in figure 19 , provide the means necessary to toggle the
display module between RS-232, TTL and I 2 C protocols. As a default, the jumpers are set to RS-232 mode
with zero ohm resistors on the 232 jumpers. In order to place the display module in I 2 C mode you must
first remove the zero ohm resistors from the 232 jumpers and then solder the resistors on to the I2C jumpers.
The display will now be in I
2 C mode and have a default slave address of 0x50 unless it has been changed.
Similarly, in order to change the display to TTL mode, simply remove the zero ohm resistors from the 232
or I
2 C jumpers and solder them to the TTL jumpers.
Figure 19: Protocol Select Jumpers
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