AHRS500CA Series User’s Manual
Page 8
Doc# 7430-0050-03 Rev. A
The unit has both an RS-232 and RS422 serial interface. During factory
configuration, one port is configured as the user data port while the other is
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 AHRS500CA 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
magnetometer 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 AHRS500CA, no connection is made to the
factory test pin. This pin has an internal pull -up mechanism and must have
no connection for the AHRS500CA 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 4.
Table 4 DB-9 COM Port Connections
COM Port Connector
AHRS500CA Connector
Pin #
Signal
Pin #
Signal
2
RxD
1
TxD
3
TxD
2
RxD
5
GND*
4
GND*
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