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CN5
Connector for piezoelectric buzzer (optional)
Pin
1
2
V16 = BC817 and R18 = 4.7kOhm must be added
This is a switched output (max. 150mA) which is activated by the BEL control
character (07h) for approx. 30ms.
CN6
Connector for Serial Interface
Pin
1,2,4,7,8
3
5
6
9
10
The plug is positioned so that a 1-to-1 link to a 9-pole sub-D bushing or bracket
connector can be created using a flatband cable.
The +5V on Pin 10 can be used as a power output for further components, although
dissipation should be checked if a voltage stabilizer is used.
CN7
Connector for 20x2/40x2 LCD display
Pin
1
2
3
4
5
6
7
8
Please note:
Resistors R5 and R9 should be soldered corresponding to the installed backlights.
Dissipation should be taken into account!
Examples
Backlight +UB
4.2V
Copyright BECKMANN+EGLE GmbH, all rights reserved.
Assignment
+
GND
Assignment
associated pin
Sub-D jack
=PC side
(not
assigned)
TXD
2 (=RXD)
RXD
3 (=TXD)
RTS
8 (=CTS)
GND
5 (=GND)
+5V
-
Assignment
GND,0V
+ 5V
VEE (Contrast Voltage)
RS (Register Select)
R/W (Read/Write)
E (Enable Signal)
DB0 (Data Bus)
DB1
If connector cables for LCDs are used, pull-up resistors must be
positioned on all control and data circuits (Pin4 - Pin14).
Power
consumption
approx. 170mA
Pin
Assignment
9
DB2
10
DB3
11
DB4
12
DB5
13
DB6
14
DB7
15
(Backlight +UB via R9/R10)
16
(Backlight GND via R5/R6)
voltage multiplier
possible layout
needed (OHM)
R5
4.7
4.7
Page 8
R9
Jumper
standard
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