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Pin #
Description
11
GND
12
D1
13
CS7
14
A19
15
D0
16
GND
17
VCC3V3
18
PRNCLK
19
A20
20
CS4
21
PRINTMOD1
22
CS6
23
PRINTMOD2
24
GND
25
8MHz
26
GND
27
CSCRT
28
CSUSB
29
VCC3V3
30
GND
31
HWR
32
NC
33
CS42
34
CS43
35
CS44
36
GND
37
INCLK
38
GND
39
GND
40
GND
41
VCC3V3
42
DPR
43
LATCH
44
CS41
Tab. 2.3: Pin description for U5 circuit (cntd.)
Fig. 2.11: Control circuit for the printer step motor (the LTP 2W42 printers contains two step motors, each with its independ-
Euro 2500
TX
Type
Signal description
I
0V power supply
I
Data input from data bus
I
Circuit activation for printer hour and data production
I
Address input
I
Data input from data bus
I
0V power supply
I
+3.3V power supply
O
Printer clock output
I
Address input
I
Address decoder input
I
Circuit actuating signal for printer hour and data production
I
Address decoder input
I
Circuit actuating signal for printer hour and data production
I
0V power supply
O
Clock output for DUART
I
0V power supply
O
Current time circuit activation
O
Additional communication channel activation
I
+3.3V power supply
I
0V power supply
I
Sigal of data logging into circuit
Unused
O
#2 RAM memory activation
O
#3 RAM memory activation
O
#4 RAM memory activation
I
0V power supply
I
System clock input
I
0V power supply
I
0V power supply
I
0V power supply
I
+3.3V power supply
O
Data output for printer
O
Signal of data logging into U4 circuit
O
#1 RAM memory activation
ent control)
Service manual
19
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