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4.6.4
Logging Interval (dCF03)
The user may configure four time intervals between data recordings. Data is logged at exact intervals in accor-
dance with the real time clock. The clock is factory set at Greenwich Mean Time.
4.6.5
Thermistor Format (dCF04)
The user may configure the format in which the thermistor readings are recorded. The low resolution is a 1 byte for-
mat and the normal resolution is a 2 byte format. The low requires less memory and records temperature in 0.25°C
(0.45°F) steps when in the perishable mode or 0.5°C (0.9°F) steps when in the frozen mode. The normal records
temperature in 0.01°C (0.02°F) steps for the entire range.
4.6.6
Sampling Type (dCF05 & dCF06)
Three types of data sampling are available, average, snapshot and USDA. When configured to average, the aver-
age of readings taken every minute over the recording period is recorded. When configured to snapshot, the sen-
sor reading at the log interval time is recorded. When USDA is configured the supply and return temperature
readings are averaged and the 3 USDA probe readings are snapshot.
4.6.7
Alarm Configuration (dCF07 - dCF10)
The USDA and cargo probe alarms may be configured to OFF, ON or AUTO.
If a probe alarm is configured to OFF, then the alarm for this probe is always disabled.
If a probe alarm is configured to ON, then the associated alarm is always enabled.
If the probes are configured to AUTO, they act as a group. This function is designed to assist users who keep their
DataCORDER configured for USDA recording, but do not install the probes for every trip. If all the probes are dis-
connected, no alarms are activated. As soon as one of the probes is installed, then all of the alarms are enabled
and the remaining probes that are not installed will give active alarm indications.
The DataCORDER will record the initiation of a pre-trip test (refer to
tests included in pre-trip. The data is time-stamped and may be extracted via the Data Retrieval program. Refer to
Table 4–9
for a description of the data stored in the DataCORDER for each corresponding Pre-Trip test.
4.6.8
DataCORDER Power-Up
The DataCORDER may be powered up in any one of four ways:
1. Normal AC power: The DataCORDER is powered up when the unit is turned on via the stop-start switch.
2. Controller DC battery pack power: If a battery pack is installed, the DataCORDER will power up for com-
munication when an interrogation cable is plugged into an interrogation receptacle.
3. External DC battery pack power: A 12-volt battery pack may also be plugged into the back of the interro-
gation cable, which is then plugged into an interrogation port. No controller battery pack is required with this
method.
4. Real Time Clock demand: If the DataCORDER is equipped with a charged battery pack and AC power is
not present, the DataCORDER will power up when the real time clock indicates that a data recording should
take place. When the DataCORDER is finished recording, it will power down.
During DataCORDER power-up, while using battery-pack power, the controller will perform a hardware voltage
check on the battery. If the hardware check passes, the Controller will energize and perform a software battery volt-
age check before DataCORDER logging. If either test fails, the real time clock battery power-up will be disabled
until the next AC power cycle. Further DataCORDER temperature logging will be prohibited until that time.
An alarm will be generated when the battery voltage transitions from good to bad indicating that the battery pack
needs recharging. If the alarm condition persists for more than 24 hours on continuous AC power, the battery pack
needs replacement.
4.6.9
Pre-Trip Data Recording
The DataCORDER will record the initiation of a pre-trip test (refer to
tests included in pre-trip. The data is time-stamped and may be extracted via the Data Retrieval program. Refer to
Table 4–9
for a description of the data stored in the DataCORDER for each corresponding Pre-Trip test.
T-316
Section
Section
4–14
4.5) and the results of each of the
4.5) and the results of each of the
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