WARNINGS
?
Do not apply and power with reversed polarization
?
Do not apply any voltage other than the speci?ed voltage
?
Do not use any cables other than the cables supplied by Matrix
Orbital, unless aware of the modi?cations required
?
Do not under any circumstances use an unmodi?ed ?oppy drive
power cable in the wrong connector
2.2 Protocol Select Jumpers
The
Protocol Select Jumpers, pictured below in Figure 12, provide the means necessary to
toggle the
display module between RS-232, TTL and I2C 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 I2C mode you must ?rst
remove the zero ohm resistors from the 232 jumpers and then solder the resistors on to the I2C jumpers, or
bridge solder across the pads. 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.
Figure 12: Protocol-Select-Jumpers
Matrix Orbital GLK12232-25-SM
8
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