Technical FAQs

Ask a Question

What are the computer interface port specifications for the 3G Smart-UPS family?


Issue:

What are the computer interface port specifications for the 3G Smart-UPS family?

Product Line:

Smart-UPS

Environment:

All SU models, All Serial Numbers

Cause:

APC uses propriatary technology in our serial cables, however some basic functionality can still be had by connecting directly to the serial port on the UPS.

Resolution:
The computer interface port in the third generation (3G) Smart-UPS has the following characteristics: 1) Pins 3, 5, and 6 are open collector outputs which must be pulled up to a common referenced supply no greater than +40 Vdc. The transistors are capable of a maximum non-inductive load of 25 mAdc. Use only pin 4 as the common. 2) Pin 2 generates a low to high transition at RS-232 levels when the UPS signals that it is on-battery. Pin 2 is also the RS-232 data output (TXD). 3) The UPS will shut down when a high RS-232 level is sustained on pin 1 for 4.5 seconds. The UPS responds to this signal only after a delay and during a power utility failure (when the UPS is operating on battery). Pin 1 is also the RS-232 data input (RXD). 4) Apply a momentary (approximately 1 second) high RS-232 level to pin 7 to turn on the UPS and any attached loads. A momentary low turns off the UPS and its load. Pin 7 should be unconnected normally. 5) DC operating voltage is available at pin 8.
 
Was this helpful?
What can we do to improve the information ?