EIA-449 Secondary Interface
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| Pin | Signal | Pin | Signal |
|---|---|---|---|
| 1 | Shield | 6 | Recieve Common |
| 2 | Secondary Receiver Ready | 7 | Secondary Request to Send |
| 3 | Secondary Send Ready | 8 | Secondary Clear to Send |
| 4 | Secondary Receiver Data | 9 | Send Common |
| 5 | Signal Ground | ||
EIA-449 Secondary Interface
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