Abbott aim Technical & Service Manual page 88

Section 6, Troubleshooting
Table 6-6. AIM/AIM Plus Port Assignments
Port # Description
PW2 | Tach strobing pulse, period = 50 microsec, low for 10 microsec., high for 40 microsec.
PW3 | Beeper drive frequency and duty cycle.
PW4 | PWM contrast control for display, minimum duty cycle = maximum contrast.
PAXO | Backup CPU output for audible alarm, 1 = alarm, overrides PWM output from the main CPU.
PAX1 | Serial RS-232 control signal output from CPU.
PAX2 | Controls power to serial RS-232 interface circuit, 1 = ON.
PAX3 | Serial RS-232 control signal input to CPU.
PAX4 | Output from backup CPU to turn off motor, 1 = motor off.
PAX5 | Output from backup CPU to signal communications is ready.
PAX6 | Output from CPU to turn on AA alkaline battery test circuit and apply load to battery, 1 = ON.
PAX? | Battery test circuit control, 1 = ON.
PBXO | Output from.CPU for.keypad.column O drive.
PBX1 | Output from CPU for keypad column 1 drive.
PBX2 | Output from CPU for keypad column 2 drive.
PBX3 | Output from CPU for keypad column 3 drive,
PBX4 | Output from CPU for keypad column 4 drive.
PBX5 | Unused.
PBX6 | Output from CPU to control alarm LED, 0 = ON.
PBX7 | Unused.
PCXO | Input to CPU for keypad row 0.
PCX1 | Input to CPU for keypad row 1.
PCX2 | Input to CPU for keypad row 2.
PCX3 | Input to CPU for keypad row 3.
PCX4 | Input to CPU for keypad row 4.
PCX5 | Input to CPU for keypad row 5.
PCX6 | Input to CPU for keypad row 6.
PCX7 | Unused.
430-600035-002 (Rev. 11/99) 6-22 AJM/AIM Plus Technical Service Manual