Smiths Medical 1818R, Руководство по эксплуатации и обслуживанию

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Chapter 9: Service Maintenance and Repair
Oximeter Operation and Service Manual 9-5
CON2,
CON3 Probe LED’s driving signals.
/DSP-
EN Enable display drivers signal.
DSP-LD Signal used to load data into display drivers.
FET-ON Used to control MOSFET H-bridge Q8 and Q9, which powers
probe LED’s.
INTGAT Signals used to enable integrator U27B.
IR-DRV Used to control MOSFET H-bridge Q8 and Q9, which powers
probe LED’s.
/NMI Non-Maskable Interrupt that signals watch dog timer time-out.
PON Power on signal.
CLK Clocks data into digital potentiometer chip U5.
POT-LD POT-LD is used to select digital potentiometer chip U5.
SDI Serial Data Input to digital potentiometer chip U5.
PRB-
DET PRB-DET is used to inform processor if probe is plugged in.
/PRB-
FAULT Signal used to inform processor about probe cable problem.
QUIET Signal used to shut down power down supply during data acquisi-
tion.
RX External RS-232 receive (CTS0) line.
RED-
DRV Used to control MOSFET H-bridge Q8 and Q9, which powers
probe LED’s.
RESET System reset signal generated by the watch dog timer U18.
RST-
INT Resets integrator U27B by shorting capacitor C50.
SHT-
DWN Output of the microprocessor to turn unit off.
TX External RS-232 transmit line.
/TEN Signal which enables RS-232 driver. Is connected to PRB-DET
signal.