Detailed descriptions
16.1 Motherboard
SIMATIC IPC647C
152
Operating Instructions, 12/2010, A5E02669337-02
Serial interfaces COM1, COM2 (V24), X617, X615
Serial interface
Pin no.
Short name
Meaning
Input / output
1
DCD (M5)
Receive signal (carrier)
Input
2
RxD (D2)
Receive data
Input
3
TxD (D1)
Send data
Output
4
DTR (S1)
Data terminal ready
Output
5
GND (E2)
Functional ground (reference potential) –
6
DSR (M1)
Ready for operation
Input
7
RTS (S2)
Request to send
Output
8
CTS (M2)
Clear to send
Input
9
RI (M3)
Incoming call
Input
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
–
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