Advantech HMI-640S user manual I/O Arrangement, COM2 port settings

1.4 I/O Arrangement

The I/O arrangement of the HMI-640S is shown below:

b c d

a e

	j i	h		g f
a.	IDE connector		f.	Ethernet port
b.	PC/104 slot		g.	Parallel port
c.	PS/2 keyboard and		h.	24 VDC input connector
	mouse connector			& chassis GND
d. Serial COM2 port			i.	LCD contrast
e.	Serial COM1 port		j.	Slide power switch

Note:	Serial port COM2 can be configured to operate in
	RS-232, RS-422 or RS-485 mode. This is set by DIP
	switches on the upper side of the back cover. Before
	attaching connectors, please make sure the DIP
	switch settings are correct. (See Appendix B for
	COM2 port settings.)

6 HMI-640S User's Manual