PNI SENtral - Manual (Page 27)

PNI Sensor Corporation Doc #1018049 R03
SENtral Technical Data Sheet Page 26
Uses for the Pass-Through State include:

Direct control of sensors, if desired.

Debugging.

Communication with the dedicated EEPROM, if implemented. Specifically, if a new
Configuration File is generated, the host can write this into the EEPROM when in
Pass-Through State.
Since operating in Pass-Through State requires stopping the SENtral algorithm, Pass-
Through State is not recommended for accessing sensor data unless reliable heading data is
not required. If sensor data and reliable heading data are both desired, scaled sensor data can
be accessed during Normal Operation from the Results Registers, as given in Table 5-6.
Table 5-8 provides the registers associated with Pass-Through State.
Table 5-8: Pass-Through Registers
Register Name Address Register Value
AlgorithmControl 0x54
[0] 1 = StandbyEnable
0 = Disable Standby State
AlgorithmStatus 0x38
[0] 1 = SENtral in Standby State
0 = SENtral not in Standby State
PassThroughControl 0xA0
[0] 1 = Enable Pass-Through State
0 = Disable Pass-Through State
PassThroughStatus 0x9E
[0] 1 = SENtral in Pass-Through State.
0 = SENtral not in Pass-Through State.
The steps to go in and out of Pass-Through State are given below.

Write 0x01 to the AlgorithmControl register. This places SENtral in Standby State.

Write 0x01 to the PassThroughControl register. This places SENtral in Pass-Through
State.

Read the PassThroughStatus register. If bit [0] is ‘1’, then SENtral is in Pass-
Through State. This step is optional.

When you are done in Pass-Through State, write 0x00 to the PassThroughControl
register. This terminates Pass-Through mode and returns SENtral to Standby State.

Write 0x00 to the AlgorithmControl register. This takes SENtral out of Standby State
and normally will place it back into Normal Operation.