3
3.1 Internal Circuit
DB9 Internal Circuit Diagram
3. Specifications
3.2 Electric Specifications
DB9 Port Electric Specifications
Parameter
Symbol
Max.
Min.
Unit
Resistor*
DC Current
IR
6
1
mA
Diode
Reverse Voltage
VR
6
-
V
Forward Current
IF
50
-
mA
Peak Forward Current
IF (Peak)
1
-
A
Relay
DC Voltage
VDC
24
-
V
DC Current
IDC
1.0
-
A
Note:
DC current should be lower than 6mA. When the DC current exceeds 6mA, a resistor within DC current limitation should be added within the Remote
Shutdown/Common loop (e.g. a 2K resistor with at least 0.1W rating power). For more information, refer to diagrams A and B in
3.5 Application Example
.
3.3 Pin Assignment
Pin Assignment
Function
I/O
Pin 1
UPS Failure
O/P
Pin 2
UPS Audible Alarm
O/P
Pin 3
GND (Common for Pin 4)
Power Ground
Pin 4
Remote Shutdown
I/P
Pin 5
Common for Relays
Power Supply
Pin 6
Bypass Active
O/P
Pin 7
Low Battery
O/P
Pin 8
UPS On
O/P
Pin 9
Utility Failure
O/P
Note:
The shutdown pin (pin 3 and pin 4) only accepts 3-10s high level signal to perform the UPS shutdown.
