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