Communication
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Avaya
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RS9 UPS (9–18 kVA, 9-Slot Models) Site Preparation, Installation and Operator’s Manual
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164201543 Rev A
DB-9 Communication Port
Figure 27 shows the Avaya RS9 DB-9 communication port and Table 6
explains the functions of the pins.
DB-9 Connector for
Computer Cable
Figure 27. Communication Port
Table 6. DB-9 Port Signals
Pin
Function
Description
1
Low Battery Alarm
Pin 1 shifts from RS-232 Low (positive voltage) to RS-232 High (negative voltage) and
remains high whenever the UPS enters a Low Battery alarm state.
2
RS-232 Transmit Data
Sends outgoing RS-232 communication data at 9600 baud, 8 bits, no parity, 1 stop bit.
3
RS-232 Receive Data/
RS-232 Shutdown
RS-232 Receive Data Function.
Receives incoming RS-232 communication data at
9600 baud, 8 bits, no parity, 1 stop bit.
RS-232 Shutdown Function.
If Pin 3 receives an RS-232 Low signal (+Vdc) for at least
5 seconds, but not more than 7 seconds, during an AC Failure condition, the UPS output
shuts off following a delay of 120 seconds (±5 seconds).
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The UPS output shuts off even if the normal AC input power is restored during the
120 second delay.
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The UPS output automatically restarts after the UPS determines the normal AC input
power is stable.
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The shutdown and restart timing represented by the functionality of Pin 3 is
independent from the shutdown and restart timing specified from the host software.
4
Reserved
Loopback to Pin 6.
5
Common
Signal Ground
6
Reserved
Loopback to Pin 4.
7
No Connection
Open pin
8
AC Fail Signal
(On-Battery)
Pin 8 shifts from RS-232 Low (positive voltage) to RS-232 High (negative voltage) and
remains high for 15 seconds (±1 second) after the UPS detects an AC Failure condition,
assuming the condition still exists after the 15 seconds.
When the AC Failure condition no longer exists, the signal returns to the RS-232 Low
state (positive voltage).
9
DC Supply Voltage
(Default)
Nominal 12 Vdc/5W; 8V minimum, 24V maximum.