Detailed descriptions
16.1 Motherboard
SIMATIC Rack PC 847B
130
Operating Instructions, 06/2008, A5E02203168-01
Parallel interface LPT1, X609
Parallel interface
Pinno.
Short name
Meaning
Input / output
1
/ Strobe (CLK)
Data message
Output (open collector)
2
Data - Bit 0
Data channel 0
Output (TTL level)
3
Data - Bit 1
Data channel 1
Output (TTL level)
4
Data - Bit 2
Data channel 2
Output (TTL level)
5
Data - Bit 3
Data channel 3
Output (TTL level)
6
Data - Bit 4
Data channel 4
Output (TTL level)
7
Data - Bit 5
Data channel 5
Output (TTL level)
8
Data - Bit 6
Data channel 6
Output (TTL level)
9
Data - Bit 7
Data channel 7
Output (TTL level)
10
/ACK
Data acknowledge
Input (4.7 kΩ pull up)
11
BUSY
Not ready
Input (4.7 kΩ pull up)
12
PE (PAPER END)
Paper end
Input (4.7 kΩ pull up)
13
SELECT
Device selection
Input (4.7 kΩ pull up)
14
/ AUTO FEED
Automatically new line
Output (open collector)
15
/ ERROR
Device error
Input (4.7 kΩ pull up)
16
/ INIT
Reset / Initialization
Output (open collector)
17
/ SELECT IN
Printer selection
Output (open collector)
18 – 25
GND
Ground
–
PS/2 mouse interface, X21 7 to 12
PS/2
Pin no.
Short name
Meaning
Input / output
1
DAT
Data channel, mouse Input/output
2
–
Not used
–
3
GND
Ground
–
4
P5VFK
+ 5 V (fused)
Output
5
CLK
Clock channel,
mouse
Input/output
6
–
Not used
–
