The following document describes the standard UPS communication interface that Systems Enhancement Corporation has adopted.
Connector: D-Sub-9 Female
Communication Interface Pin Assignment
| PIN NUMBER | SIGNAL | DESCRIPTION |
|---|---|---|
1 |
Inverter Shutoff |
The UPS shuts off when a high RS-232 level is applied to pin 1 for .5 seconds. The UPS responds to this signal, after a delay, and only during on-battery operations. |
2 |
ByPass Active |
UPS relay closes between pins 2 & 4 when the power supply has a failure or is being serviced and power is being provided to the system from the utility power line. |
3 |
AC Fail (N.O.) |
UPS relay closes between pins 3 & 4 when input power is lost. |
4 |
Common |
Switch common for pins 2, 3, 5, 6. |
5 |
Low Battery (N.O.) |
UPS relay closes between pins 5 & 4 when UPS battery has less than 2 minutes of life left. |
6 |
UPS On |
The UPS is powered on and is capable of providing power to the system. |
7 |
TXD |
RS-232 Transmit Data |
8 |
RXD |
RS-232 Receive Data |
9 |
Ground |
Communication Signal Ground |
|
Pin 4 should be connected to ground |
RS232 Technical Specification Summary
|
Connector:
|
9 pin, Type D, Female |
|
Format:
|
ASCII 8 Bit, One Start Bit, One Stop Bit |
|
Baud Rate:
|
Default 2400 |
|
Parity:
|
None |
|
Duplex:
|
Full |
|
Delimiters:
|
Carriage Return per Block |
