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ALARMS (continued)
Remote Management DB-25 Connector Pin Out**
Pin Out
Description
Pin # 1
Frame Ground
Pin # 3
+ Data Alarm (RS485/R2422 Interface)
Pin # 16
– Data Alarm (RS485/R2422 Interface)
Pin # 7
Signal Ground
Pin # 8
+ 5 V or (TTL logic High at Power ON)
Pin # 9
– Low Volt Alarm (RS485/R2422 Interface)
Pin # 17
+ Low Volt Alarm (RS485/R2422 Interface)
TABLE: 1
Note
**
Pins not mentioned in the table do not have any connections
To understand the power and system alarm remote monitoring, please refer to the following
graphs:
Note
Output DC voltage reduction level is reciprocal to the output
frequency at the RS484/RS422 interface. As the voltage decreases
from about 10V to Threshold Voltage
(due to overload)
, the
frequency respectively increases from 0Hz to 4.9Hz.
0V
≈
10V
≈
4.9 Hz
0Hz
Frequency at
pins 9 & 17
Voltage
Graph 1. PS Alarm or Low Voltage Alarm System
Threshold
Voltage
