Pro-face PS-3700A, User Manual, Page: 21 / 131

Compact Panel Computer PS-3700A (Pentium
®
4M - 1.7GHz Model) User Manual
1-8
• COM3 and COM4 cannot be used for +5V Output.
• Do not connect any pins to COM3 [NC].
• No. 5 pin (GND) for RS-232C (COM1,COM2,COM3, COM4) is the signal ground.
Be sure to connect the GND terminal to the other unit’s SG (signal ground) termi-
nal.
• Be sure to confirm what settings will be used by the other device when setting the
switches. Failure to do so can result in a unit malfunction or damage.
• Whenever changing any PS-A switch settings, be sure to first turn the PS-A’s
power supply OFF. Failure to do so can cause a PS-A malfunction.
• Connect the FG terminal line to the connector cover’s PS-A connector attach-
ment screw.
• FG and SG terminals are internally connected in the PS-A. When connecting to
another device, be sure to create an SG shorting loop in your system.
• Use inch type (#4-40UNC) threads to hold the cable’s set (attachment) screws in place.