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

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Power Through DB9 Jumper
In order to provide power through pin 9 of the DB-9 Connector you must connect the Power Through
DB-9 Jumper labelled R30, as illustrated below. This connection can be made using a zero ohm resistor,
recommended size 0603, or a solder bridge. The GLK24064-25/GLT24064 allows all voltage models to
use the power through DB-9 option, see the specifications in Table 65 for voltage requirements.
Power Through DB9 Jumper
Protocol Select Jumpers
The Protocol Select Jumpers provide the means necessary to toggle the standard GLK24064-
25/GLT24064 model between RS-232, TTL and I²C protocols. As a default, the jumpers are set to RS-232
mode with solder jumps on the 232 jumpers. In order to place the display module in I²C mode you must
first remove the solder jumps from the 232 jumpers and then place them on the I
2 C jumpers. The
display will now be in I²C 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 I²C jumpers and solder them to the TTL jumpers. Protocol tables are shown below where an `X`
designates a connected jump while an ‘O’ signifies an open connection.
Table 8: RS232 Protocol Settings
RS232 TTL I
2
C
X X X 0 0 0 0
Table 9: TTL Protocol Settings
RS232 TTL I
2
C
O O O X X O O
Table 10: I
2
C Protocol Settings
RS232 TTL I
2
C
O O O O O X X