Matrix-orbital LK402-25 Legacy Manual de usuario descargar pdf (Pagina 13)

Table 1: Default Values

Contrast 128

Brightness 255

Baud Rate 19.2 kbps

C Slave Address 0x50

Data Lock False

RS232AutoTransmitData True

NOTE The display module will revert back to the old settings once turned off, unless the

settings are saved.

2.7 Keypad Interface Connector

The LK402-25 provides a Keypad Interface Connector which allows for up to a ﬁve by ﬁve matrix style

keypad to be directly connected to the display module. Key presses are generated when a short is detected

between a row and a column. When a key press is generated a character, which is associated with the

particular key press, is automatically sent on the Tx communication line. If the display module is running

in I

C mode, the “Auto Transmit Keypress” function may be turned off, to allow the key presses to remain

in the buffer so that they may be polled. The character that is associated with each key press may also be

altered using the “Assign Key Codes” command, for more detailed information see the Keypad Section, on

page 30.

Figure 16: Keypad Interface Connector

NOTE The Ground / +5V pin is toggled by the jumper to the right of the keypad connec-

tor. Jump 1 & 2 for +5V or 2 & 3 for GND.

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Matrix-orbital LK402-25 Legacy Manual de usuario Pagina 13