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| Analog common (Ab) |
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| Digital common (Db) |
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| Analog output 0 (AO0) |
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| FIRSTPORTA Bit 0 (A0) |
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| Analog output 1 (AO1) |
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| FIRSTPORTA Bit 1 (A1) |
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| NC |
| A | FIRSTPORTA Bit 2 (A2) |
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| NC |
| FIRSTPORTA Bit 3 (A3) |
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| Analog Out | Analog common (Ab) |
| FIRSTPORTA Bit 4 (A4) |
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| CAL (Reserved for |
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| FIRSTPORTA Bit 5 (A5) |
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| Signal ground (Sb) |
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| FIRSTPORTA Bit 6 (A6) |
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| Digital common (Db) |
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| FIRSTPORTA Bit 7 (A7) |
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| TTL trigger (TRG) |
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| Digital common (Db) |
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| Output scan clock I/O (DPR) |
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| Timer 0 (T0) |
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| Input scan clock I/O (APR) |
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| Timer 1 (T1) |
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| Analog common (Ab) |
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| Digital common (Db) |
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| CH 0 HI (0H) |
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| FIRSTPORTB Bit 0 (B0) |
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| CH 0 LO (8L) |
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| FIRSTPORTB Bit 1 (B1) |
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| Analog common (Ab) |
| B | FIRSTPORTB Bit 2 (B2) |
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| CH 1 HI (1H) |
| FIRSTPORTB Bit 3 (B3) |
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| Port |
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| Analog In | CH 1 LO (9L) |
| FIRSTPORTB Bit 4 (B4) |
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| Analog common (Ab) |
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| FIRSTPORTB Bit 5 (B5) |
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| CH 2 HI (2H) |
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| FIRSTPORTB Bit 6 (B6) |
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| CH 2 LO (10L) |
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| FIRSTPORTB Bit 7 (B7) |
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| Analog common (Ab) |
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| Digital common (Db) |
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| CH 3 HI (3H) |
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| Counter 0 (CT0) |
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| CH 3 LO (11L) |
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| Counter 1 (CT1) |
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| Analog common (Ab) |
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| Digital common (Db) |
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| CH 4 HI (4H) |
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| FIRSTPORTC Bit 0 (C0) |
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| CH 4 LO (12L) |
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| FIRSTPORTC Bit 1 (C1) |
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| Analog common (Ab) |
| C | FIRSTPORTC Bit 2 (C2) |
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| CH 5 HI (5H) |
| FIRSTPORTC Bit 3 (C3) |
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| Analog In | CH 5 LO (13L) |
| FIRSTPORTC Bit 4 (C4) |
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| Analog common (Ab) |
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| FIRSTPORTC Bit 5 (C5) |
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| CH 6 HI (6H) |
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| FIRSTPORTC Bit 6 (C6) |
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| CH 6 LO (14L) |
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| FIRSTPORTC Bit 7 (C7) |
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| Analog common (Ab) |
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| Digital common (Db) |
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| CH 7 HI (7H) |
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| Counter 2 (CT2) |
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| CH 7 LO (15L) |
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| Counter 3 (CT3) |
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DSUB25F expansion connector
131
25 14
Figure 2. DSUB25 expansion connector pin out
14