Communication
Table 7-2. Pin Assignments for Port 2 (DB-25)
Pin Number | Symbol | Function | Comments |
|
|
|
|
1 | GND | Chassis Ground |
|
|
|
|
|
2 | TXD | Transmit Data | Input to UPS |
|
|
|
|
3 | RXD | Receive Data | Output from UPS |
|
|
|
|
4 | RTS | Request to Send | Input to UPS |
|
|
|
|
5 | CTS | Clear to Send | Output from UPS |
|
|
|
|
6 | DSR | Data Set Ready | Output from UPS |
|
|
|
|
7 | RTN | Return |
|
|
|
|
|
8 | +12V | +12 Volts | Output from UPS - always true |
|
|
|
|
20 | DTR | Data Terminal Ready | Input to UPS - typically not used by UPS |
|
|
|
|
22 | Output from UPS - always true | ||
|
|
|
|
NOTE Pins 5 and 6 are tied together internally.
EATON Powerware® 9315 UPS | 7−5 |