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BEST 510
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Pins 2, 3 and 5 are all driven by open collector transistors. Pull up
resistors are required on the host computer side.
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Pin 2 is closed and Pin 3 is open when the utility is unavailable.
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When the battery backup time is less than 2 minutes, Pin 5 is
closed.
•
In any condition, shorting Pin 8 with Pin 4 for 0.5 seconds will turn
off the UPS.
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Keeping Pin 6 in RS-232 high level (5-12V) for 0.5 seconds will
shut down the UPS. The UPS automatically “wakes up” when the
utility comes back. This shutdown function only operates in battery
mode.
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Pin 6 , Pin 7 and Pin 9 are for the RS-232 serial interface.
NOTE
1.
Pins 2, 3 and 5: current 20Vdc, 50mA non-inductive.
2.
Pin 4 should be connected to ground only.
COMMUNICATIONS
(cont.)
COMMUNICATION PORT
The UPS provides signals and RS-232 interface on a DB9 connector for the
host computer to contol the UPS and obtain the utility status.
The pin assignment for the female DB9 connector is:
Pin 1: NOT USED
Pin 2: LINE FAIL CONTACT (normally open)
Pin 3: LINE FAIL. (normally closed)
Pin 4: COMMON for Pins 2, 3, 5 and 8.
Pin 5: TWO MIN. CONTACT. (normally open)
Pin 6: RS-232 DATA TO UPS (RX)/
SHUTDOWN (high level)
Pin 7: RS-232 COMMON
Pin 8: REMOTE OFF (low level)
Pin 9: RS-232 DATA from UPS (TX).
Communications
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