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10 Control Signal Inputs
10.1 Config-RST-In (Configuration Reset) Input
The 1775 IMU has a differential input labeled Config-RST-In+/Config-RST-In- on the external
connector that can be used to perform a configuration reset of the system. This input is only
monitored at startup and is ignored during normal operation. These pins may be left
disconnected at the unit interface connector unless use is desired.
To reset all configuration settings (including baud) to their factory defaults, assert a positive
RS-422 compliant voltage from the Config-RST-In+ pin to the Config-RST-In- pin before
restarting the unit. The unit may be restarted by one of the following: applying power, applying
external reset, or sending the =RESTART command. If used, the configuration reset condition
should be held until the unit starts outputting Normal Mode data. This will default unit
configuration similar to the =RSTCFG command. The differences are that =RSTCFG
command does not require an actual unit restart.
The default configuration parameters are listed in Section 9.1.
10.2 EXT-RST (External Reset) Input
The 1775 IMU has a differential input labeled EXT-RST+/EXT-RST- on the external connector
that can be used to perform a hardware reset (cold start) of the system. Asserting a positive
RS-422 compliant voltage from the EXT-RST+ pin to the EXT-RST- pin at any time will result
in a reset. These pins may be left disconnected at the unit interface connector unless reset is
desired.
External reset operation is similar to a power-cycle of the power inputs in that certain parts of
the system will experience a hardware reset signal. It should result in the system reboot of
programmable devices and configurations. However, not all devices (e.g., power supplies) will
be reset.
A unit in Configuration Mode (=CONFIG,1 command) will restart to the configured Normal
Mode. Other configuration parameters will be recalled from non-volatile memory.
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