APC SMARTSLOT DP300E - Manual (Page 33)

27
Specifications
Monitoring port
pin assignments
The Monitoring port is a 9-pin communications port. The
port operates with no flow control at a rate of 2400 baud.
The data format is 8 data bits with 1 start bit, 1 stop bit, and
no parity.
When the Triple Chassis operates with simple signaling, the
following limitations and capabilities apply to the Monitor-
ing port:
• 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 non-inductive load of 25 mA. Use only Pin 4 as the
common.
• The output at Pin 2 generates a low-to-high RS-232
level when the device is signaling an On Battery con-
dition. The pin is normally at a low RS-232 level.
• The UPS is signaled to shut down when a high RS-
232 level is applied to Pin 1 for 4.5 seconds. Shut-
down is also dependent on the UPS status.
When the Triple Chassis operates with advanced signaling,
the following limitations and capabilities apply to the Moni-
toring port:
• Pin 7 is unassigned.
• DC operating voltage is available on Pin 8. This volt-
age may be from the UPS or from an external adapter,
whichever is greater.
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