IPC-1600 80-Pin Headers P3 and P4
| PIN |
| SIGNAL NAME | ||
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| NUMBER |
| P4 CONNECTOR | P3 CONNECTOR | |
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| 41 |
| Data Terminal Ready 3 (DTR3) | Data Terminal Ready 11 (DTR11) | |
| 42 |
| Ground (GND) | Ground (GRD) | |
| 43 |
| Request To Send 3 (RTS3) | Request To Send 11 (RTS11) | |
| 44 |
| Ground (GND) | Ground (GRD) | |
| 45 |
| Ring Indicator 4 (RI4) | Ring Indicator 12 (RI12) | |
| 46 |
| Ground (GND) | Ground (GRD) | |
| 47 |
| Ring Indicator 3 (RI3) | Ring Indicator 11 (RI11) | |
| 48 |
| Ground (GND) | Ground (GRD) | |
| 49 |
| Data Set Ready 1 (DSR1) | Data Set Ready 9 (DSR9) | |
| 50 |
| Ground (GND) | Ground (GRD) | |
| 51 |
| Receive Data 1 (RD1) | Receive Data 9 (RD9) | |
| 52 |
| Ground (GND) | Ground (GRD) | |
| 53 |
| Clear To Send 3 (CTS3) | Clear To Send 11 (CTS11) | |
| 54 |
| Ground (GND) | Ground (GRD) | |
| 55 |
| Clear To Send 1 (CTS1) | Clear To Send 9 (CTS9) | |
| 56 |
| Ground (GND) | Ground (GRD) | |
| 57 |
| Clear To Send 4 (CTS4) | Clear To Send 12 (CTS12) | |
| 58 |
| Data Set Ready 3 (DSR3) | Data Set Ready 11 (DSR11) | |
| 59 |
| Data Carrier Detect 4 (DCD4) | Data Carrier Detect 12 (DCD12) | |
| 60 |
| Receive Data 3 (RD3) | Receive Data 11 (RD11) | |
| 61 |
| Ring Indicator 1 (RI1) | Ring Indicator 9 (R19) | |
| 62 |
| Data Set Ready 2 (DSR2) | Data Set Ready 10 (DSR10) | |
| 63 |
| Ring Indicator 2 (RI2) | Ring Indicator 10 (RI10) | |
| 64 |
| Receive Data 2 (RD2) | Receive Data 10 (RD10) | |
| 65 |
| Request To Send 4 (RTS4) | Request To Send 12 (RTS12) | |
| 66 |
| Clear To Send 2 (CTS2) | Clear To Send 10 (CTS10) | |
| 67 |
| Transmit Data 3 (TD3) | Transmit Data 11 (TD11) | |
| 68 |
| Data Carrier Detect 2 (DCD2) | Data Carrier Detect 10 (DCD10) | |
| 69 |
| Request To Send 1 (RTS1) | Request To Send 9 (RTS9) | |
| 70 |
| Transmit Data 2 (TD2) | Transmit Data 10 (TD10) | |
| 71 |
| Data Terminal Ready 4 (DTR4) | Data Terminal Ready 12 (DTR12) | |
| 72 |
| Request To Send 2 (RTS2) | Request To Send 10 (RTS10) | |
| 73 |
| Data Terminal Ready 2 (DTR2) | Data Terminal Ready 10 (DTR10) | |
| 74 |
| Transmit Data 1 (TD1) | Transmit Data 9 (TD9) | |
| 75 |
| Transmit Data 4 (TD4) | Transmit Data 12 (TD12) | |
| 76 |
| Data Terminal Ready 1 (DTR1) | Data Terminal Ready 9 (DTR9) | |
| 77 |
| Receive Data 4 (RD4) | Receive Data 12 (RD12) | |
| 78 |
| Data Carrier Detect 3 (DCD3) | Data Carrier Detect 11 (DCD11) | |
| 79 |
| Data Set Ready 7 (DSR7) | Data Set Ready 15 (DSR15) | |
| 80 |
| Data Carrier Detect 1 (DCD1) | Data Carrier Detect 9 (DCD9) | |
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