Probe Type Detection; Instrument Id Logic; Circuit Operation; Table 4: Configuration Truth Table - Welch Allyn SureTemp 986 Service Manual

Appendix A. Theory of Operation
A.2.4 Probe Type Detection
A.2.5 Instrument ID Logic
Zero Ohm Resistor to be Installed at:
JP1 JP2
Y
Y
Y
Y
N
Y
N
Y
A.2.6 Circuit Operation
34
Upon power reset, the thermometer performs a probe test. Probe
type is first detected and then, if it is an oral probe, its warming
characteristics are determined. Rectal probes are not warmed, so
warming characteristics are not tested on these probes.
The instrument logic is used to determine the type of probe the
thermometer is configured for (Oral/Axillary or Rectal). This allows
the microprocessor to initiate the proper algorithm for converting a
thermistor measurement into a temperature. The configuration
truth table is listed below.

Table 4: Configuration Truth Table

JP3 JP4
Y Y Y
Y Y N
Y Y Y
Y Y N
Y Y Y
Y Y N
Y N N
Y Y N
Jumpers JP1 through JP4 are used to provide logic 0 or 1 inputs to
U1-27, 28, 29 and 30 depending on what probe and algorithm the
instrument was configured with at the factory. When a probe has
been connected, the software determines what algorithm to use
based on the jumper connections listed above.
JP5 JP6 CNFG#
Y Y
-0000
Y Y
-0001
Y N -0002
Y Y -0003
Y N -0004
Y N
-0005
Y N
-0006
Y N
-0007
Configuration
ORAL
RECTAL
INT'L
VET
ORAL, JAPAN
INT'L, RECTAL
RECTAL, JAPAN
INT'L VET
70995-0000B M986