Section VI
Control Interface Details
006-0007129 10/12/2018
Rev B
49 of 60
UPS-1500 3-Phase Guide
www.synqor.com
Digital Input/Output Control Signals
There are 2 input and 5 output digital signals available on the User I/O female high-density DB15
connector. The pin assignments and functions of these digital I/O signals are as follows:
Signal
Pin Number
Function
+5 V
8
Bias voltage with minimal current drive usable as a pull-up voltage
for the open collector output signals (100Ω source resistance)
GND
4 and 5
Ground reference for all digital inputs and outputs
LOW_BATT
6
Open collector* output where “low” indicates battery charge
level is <10%
ACIN_GOOD
7
Open collector* output where “low” indicates AC INPUT voltage
is within range
ON_BATT
9
Open collector* output where “low” indicates the UPS is drawing
power from its battery
OUT_OK
14
Open collector* output where “low” indicates AC OUTPUT voltage
is within range
OVER_TEMP
15
Open collector* output where “low” indicates that the UPS is at
or above its maximum temperature
REMOTE_START
12
Drive this line “high” with ≥ 5mA to enable the UPS outputs
SHUTDOWN
13
Drive this line “high” with ≥ 5mA to disable the UPS outputs
*with an internal 50 kΩ Pull-up Resistor to 5 V and ESD Protection Diodes.
