Detailed descriptions
16.1 Motherboard
SIMATIC HMI IPC677C
204
Operating Instructions, 04/2013, A5E02722710-04
Serial interface COM 1, X30
The COM1 serial port has the following pin assignment:
Serial interface COM1
Pin no.
Short description
Meaning
Input / Output
1
DCD (M5)
Receive signal (carrier)
Input
2
RxD (D2)
Receive data
Input
3
TxD (D1)
Transmit 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
16.1.5
Internal interfaces
Pin assignment of the internal ports
Interface
Position Connector Description
Memory
Internal X19, X20
2 DIMM sockets, 64-bit
Bus expansion
Internal X10, X610 Socket for bus expansion, assigned PCI bus
signals
Power supply
Internal X13
20-pin connector plug for power supply
BIOS Recovery
Internal X72
Serial ATA
Internal X50, X51,
X52, X53,
X54
Serial ATA, max. 3 drives operable
Connection for PS serial
ATA
Internal X26, X27,
X28, X29,
X30
Voltage supply for serial ATA
Connection for PS fan
Internal X131
Voltage supply for CPU fan, 4-pin male connector
Connection for
equipment fan
Internal X132
Voltage supply for equipment fan, 4-pin male
connector
Backup battery
Internal X24, X240 Voltage supply for backup battery, 2-pin male
connector
Tap for backup battery
Internal X2400
Voltage tap ( = 3V) of the backup battery,
2-pin, male connector
USB interface
Internal X43
USB channel 6 and 7, 10-pole male connector
USB interface
Internal X48
USB channel 9, upright USB socket