1
8
COMMUNICATIONS
C
OMMUNICATIONS
I
NTERFACE
P
ORT
The S4K
2U
UPS contains a standard DB-9 serial port female
connector located on the rear of the UPS unit. Several signals are
provided on this port and are assigned as follows:
*Maximum voltage and current on pins 1, 7, 8, and 9 is 60V DC; 10.0 mA.
P
IN
4
& 5
- R
EMOTE
S
HUTDOWN ON
B
ATTERY
1.
This pin is functional only when the UPS is in battery mode. If the UPS is
being powered by the utility, Pin 4 will ignore any signal on this pin.
2.
Pin 4 requires a 5-12 VDC signal to shutdown. This normally comes
form the serial port using Sola/Hevi-Duty’s contact closure cable. It
cannot be used with just a contact closure unless the relay is used to
switch a voltage source. A 5-12 VDC signal for 1.5 seconds or greater
is required to signal a shutdown. Signals for less than 1.5 seconds will
be ignored. After Pin 4 receives a shutdown signal for 1.5 seconds,
the command cannot be canceled.
Pin
Assignment Description
1
Low Battery (open collector)
2
UPS TxD (typical RS-232 levels)
3
UPS RxD (typical RS-232 levels)
4
Remote Shutdown (5-12VDC, 10-24 mA max); battery operation
5
Common
6
Remote Shutdown (short to pin 5); all modes of operation
7
Low Battery (open emitter)
8
Utility Fail (open emitter)
9
Utility Fail (open collector)
Pin Assignment
Collector to Emitter*
5
4
3
2
1
6
7
8
9
(-)
(+)
330 Ohms
Open
Collector
Open
Emitter
Summary of Contents for S4K2U Series
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