Intermec EasyCoder 501 XP Service Manual page 17

Chapter 2 Front and Keyboard
2.2 Keyboard/Display,
cont.
16
Console pcb
The console pcb manages the keyboard, the display, two of the
three LED control lamps, and the beeper by means of a slave pro-
cessor. The communication to and from the CPU board goes via
an I2C bus on a 10-p fl at cable. This cable is permanently affi xed
to the console pcb and connected to P37 a the front end of the CPU
board.
The display is a LCD display with background light. It has 2 × 16
character with a 5 × 7 dots matrix. 8 characters are programmable.
There is no display contrast adjustment.
The beeper has a frequency between 104 and 9,999 Hz. It is used
to acknowledge when a key is pressed and to produce various
audible signals. The key-acknowledge signal can be controlled by
the Fingerprint instruction KEY BEEP, whereas other signals are
controlled using the instructions BEEP and SOUND.
The left-hand LED control lamp (marked "Power") shines green
when the power is on. Power on is also indicated by the display's
background light. The other two LEDs are programmable using the
Fingerprint instructions LED ON and LED OFF. The center LED
is green and the right-hand is red. The right-hand LED (marked
"Error") is usually used to indicate that an error has occurred.
Keyboard Connection
Beeper
Slave Processor
Cable to CPU Board
Intermec EasyCoder 501 XP – Service Manual Ed. 4
Error LED (red)
Ready LED (green)
Power On LED (green)
LCD Display