SYSTEM - I/O PAGE
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| RL1 | preset 1 |
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| off | |
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| on | preset 2 |
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| tip | GPI Input |
| RL1 | |||||
| ring | |||||
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| nc |
| Select 1 of 2 | ||
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| sleeve |
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| RL2 | RL1 | preset 1 |
| off | off | |
| off | on | preset 2 |
RL2 | on | off | preset 3 |
R2, 22k | on | on | preset 4 |
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RL1 |
| tip | GPI Input |
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R1, 12k | nc | ring | Select 1 of 4 |
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RL3
R3, 47k
RL2
R2, 22k
RL1
R1, 12k
RL3 | RL2 | RL1 |
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off | off | off | preset 1 | |
off | off | on | preset 2 | |
off | on | off | preset 3 | |
off | on | on | preset 4 | |
on | off | off | preset 5 | |
on | off | on | preset 6 | |
on | on | off | preset 7 | |
on | on | on | preset 8 | |
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| tip | GPI Input |
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nc |
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| ring | Select 1 of 8 |
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GPI Technical specifications
Inside the processor, a 10kohm resistor connects the Tip terminal to a +5V power supply. When nothing is connected to the GPI input, the input voltage therefore is +5V. Resistors can be used to pull down the voltage as suggested in Fig 1.
In Table 1, voltages outside the limits mentioned are to be considered invalid. No action is taken if invalid measurements are made. GPI recall action resumes when a stable, valid measurement again is detected.
| Mode |
| Preset No |
| Target / Vs |
| Min typ / V |
| Target typ / V |
| Max typ / V | |
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| 1 of 2 |
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| 1 |
| 1.000 |
| 2.67 |
| 5.00 |
| 5.00 |
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| 2 |
| 0.000 |
| 0.00 |
| 0.00 |
| 0.51 |
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| 1 of 4 |
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| 1 |
| 1.000 |
| 4.16 |
| 5.00 |
| 5.00 |
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| 2 |
| 0.687 |
| 3.38 |
| 3.44 |
| 3.50 |
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| 3 |
| 0.545 |
| 2.67 |
| 2.73 |
| 2.79 |
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| 4 |
| 0.438 |
| 0.00 |
| 2.19 |
| 2.25 |
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| 1 of 8 |
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| 1 |
| 1.000 |
| 4.50 |
| 5.00 |
| 5.00 |
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| 2 |
| 0.824 |
| 4.06 |
| 4.12 |
| 4.18 |
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| 3 |
| 0.687 |
| 3.38 |
| 3.44 |
| 3.50 |
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| 4 |
| 0.600 |
| 2.94 |
| 3.00 |
| 3.06 |
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| 5 |
| 0.545 |
| 2.67 |
| 2.73 |
| 2.79 |
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| 6 |
| 0.489 |
| 2.38 |
| 2.44 |
| 2.50 |
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| 7 |
| 0.437 |
| 2.13 |
| 2.19 |
| 2.25 |
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| 8 |
| 0.400 |
| 0.00 |
| 2.00 |
| 2.06 |
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Rather than absolute voltage measurements, the windows are defined as a fraction of the 
supply voltage, Vs. This voltage can be measured with a high impedance DMM on the Tip 
terminal when no pull down resistors are applied.The table shows values as a fraction of Vs, and, as a guideline, typical voltages when Vs=5.000V. (If the Supply voltage is e.g. 5.015V, the table should be corrected by multiplying these values by 5.015/5).
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