Siemens 620 Assignment of the Internal Ports on the Motherboard, Internal Serial Port COM2

Hardware Information

Internal Serial Port COM2 (V.24)

This port is connected in parallel to the external COM2 port. Both ports can therefore only be used alternatively. The assignment is executed in such a way that a 1:1 connection to a 9 pin subminiature Cannon socket can be made when using insulation piercing connecting devices. The maximum cable length is 100cm with a data transfer rate of 9.6 Kbps.

Pin No.	Designation	Description	Input / Output
1	DCD	Receiving signal level	Imput
2	DSR	Readiness for operation	Input
3	RxD	Received data	Input
4	RTS	Switch on transmitter	Output
5	TxD	Transmitted data	Output
6	CTS	Ready to transmit status	Input
7	DTR	Terminal ready	Input
8	RI	Incoming call	Input
9	GND	Functional ground (reference	-
		potential)
10	P5V	+5V power supply	Output

7.5.3Assignment of the Internal Ports on the Motherboard

Port	Position	Connector	Description
Memory	internal	X19, X20	2 SO-DIMM slot, 64Bit
Processor	internal	X1	Socket for MMC2 mobile processor
Bus extender	internal	X10	Socket for bus extender, assigned with ISA
			and PCI bus signals
Power supply	internal	X13	20 pin connector for DC signals of the power
105W			supply unit with 85W
Power supply	internal	X14	40 pin connector for DC signals of the power
85W			supply unit with 85W
Floppy	internal	X5	two drives are possible (82078 compatible)
			360kB, 720kB, 1.2MB, 1.44MB
			3F0h-3F7h, 370h-377h, can be disabled
			IRQ 6, edge-triggered
			26 pin, socket for flex-lead (notebook
			connection)

3.5” hard disk

internal

X41

170h-177h, 1F0h-1F7h, can be disabled IRQ14, IRQ15, edge-triggered

40 pin, 2.54mm male connector (3.5” HD, primary),

a maximum of two drives are operable

SIMATIC Box PC 620 Manual	7-23
A5E00131465-01