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54
Specifications
Basic port pin
assignments
The following limitations and capabilities apply to the Basic
ports of Share-UPS:
• 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.
• The output at Pin 2 generates a low-to-
hi
g
h RS-232
level when the device is signaling an On Battery con-
dition. The pin is normally at a low RS-232 level.
• Share-UPS may be signaled to shut down the
UPS
by
applying a high RS-232 level to Pin 1 for 4.5 sec-
onds. Shutdown is also dependent on the
UPS
status
and the Share-UPS shutdown mode (see “Configur-
ing Share-UPS,” on page 23).
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