USERS MANUAL
NR2110-R/O/G
REVISION
B
DATE
120120
Page #:
36 of 47
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Calibration
NR2110-R/O/G:
There is an amplitude adjustment potentiometer which can be
accessed through the rear panel. This is located next the Alert Relay BNC.
The frequency is phase-locked to the GPS signal, and no adjustment is required.
The auto-calibration feature tunes the OCXO and stores the calibration
coefficients in non-volatile memory.
Programming Guide (RS232 Status Port)
The NR2110 can accept user commands which will provide specific fault
detection performance which may be customized by the user. The
settings can be saved in non-volatile flash memory.
If the user makes changes which are intended to be kept between power
off cycles, the command “$SAVEFLASH*51 <CR><LF>” will update flash
to reflect all current settings.
Table 1 shows a complete list of input commands and descriptions. In
general, a command may
be input without “=” or an additional value, and
the unit will respond with the current setting’s value. If the input is not
understood, the microcontroller will return the value “$?*3F<CR><LF>”
NOTE: All commands should be
prefixed with “$”, and followed by
<cr><lf>. Checksum can be enabled which requires the command
to be followed by an asterisk (*) and a two-digit hex value.
Example: $<COMMAND>*XX<cr><lf>.
The checksum can be required for all input commands, and the
requirement for a checksum can be enabled or disabled (default setting
is disabled). The checksum method is the two-hexadecimal character
representation of an XOR of all characters in the sentence between, but
not including, the $ and the * character.
Example: $NVS1=1*76