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Section 6, Troubleshooting
6.3.5
Port Assignments
Table 6.6, AIM/AIM Plus Port Assignments
.|Port#
Description
PAO | Pulses to CPU when motor turns counterclockwise.
PA1
Unused.
PA2
Output from CPU to control encoder power, 1=ON.
PA3
Output from CPU to control display backlight, O=ON.
PA4
| Pulse high from CPU to control optics LED drive, 1=ON.
PAS
| Input to CPU from the 6805. 1=6805 has a message for the 6811 CPU,
PA6 | Output from CPU to control motor drive, 1=ON.
PA7
| Input pulses to CPU when motor turns clockwise.
PDO
| Unused.
PDI
Unused.
PD2
Master in, slave out, serial data input to main CPU.
PD3
Master out, slave in, serial data output from main CPU.
PDA
| Serial clock from main CPU for SPI bus.
PDS | Unused.
PEO | Analog input to CPU from optical air detector, FS = 3.3 V (minimal light received).
PE1
Analog input to CPU from occlusion detector, FS = 3.3 V (minimal light received).
PE2
Motor current input to CPU, FS = 11 mA.
PE3
Motor voltage input to CPU, FS = 14.8V.
PE4 | Alkaline (or NiMH) battery voltage to CPU, FS = 6.6V.
PES
| 5V Regulator input to CPU, FS = 6.6V.
PE6
| Power supply input to CPU, FS = 9.9V.
PE7 | Lithium battery voltage, FS = 3.3V.
PG5
| Unused.
PG6 | Output from CPU to trigger watchdog, should occur at least every 1.0 second to prevent RESET.
РММ | PWM output for motor speed.
AIM/AIM Plus Technical Service Manual
6-21
430-600035-002 (Rev. 11/99)
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Table of Contents
Troubleshooting
