AHRS500GA Series Operator’s Manual
Page 6
Doc# 7430-0060-02 Rev. A
a factory diagnostic port to monitor BIT data. The unit can be configured to
allow either port to be the user data port, defaulting the other for BIT
diagnostics. The port definition is specified by the model configuration
chosen and will be detailed in the model configuration sheet shipped with
the unit.
3.2.5
BIT Status Output Pin
The BIT status output pin will become active high if the system is
experiencing a failure. The BIT is an open collector signal and requires a
pull-up resistor for proper operation.
3.2.6
Magnetometer calibration Input Pin
The AHRS500GA has an input pin to control the magnetometer hard -iron
calibration function. When this pin is active (low) the unit will collect the
data necessary for magnetometer calibration. When it becomes inactive, the
calibration data shall be used to compute the hard and soft iron
compensation values. During normal operation, no connection should be
made to this pin; this pin shall be tied high internally with a pull-up resistor.
This feature has been added as a means to perform a Hardiron/Softiron
calibration without sending the calibration commands to the unit. Please
see Appendix C, for a complete explanation of the Hardiron/Softiron
calibration process, and how this pin can be used as a means of
implementing the calibration.
3.2.7
No Connection
During normal operation of the AHRS500GA, no connection is made to the
factory test pin. This pin has an internal pull -up mechanism and must have
no connection for the AHRS500GA to operate properly.
3.2.8
Quick Digital interface connection
On a standard DB-9 COM port connector, make the connections as
described in Table 2.
Table 4 DB-9 COM Port Connections
COM Port Connector
AHRS500GA Connector
Pin #
Signal
Pin #
Signal
2
RxD
1
TxD
3
TxD
2
RxD
5
GND*
4
GND*
*Note: Pin 4 on the AHRS500GA is data ground as well as power ground.
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