76 Serial Communication and Command Set
nnn Channel read index (001 to 400)
mmm Channel write index (001 to 400)
NOTE: When nnn = mmm, using the EA command to read event data, the event buffer is empty,
i.e., all event data which has been recorded has also been read.
Return Clock Status
Command: SC
SC returns the current clock status.
Response: L/U, U=xx, S=nn
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Format:
L = Clock currently locked to GPS (U for unlocked).
xx = Indicates loss of lock period, up to 99 minutes.
nn = User specified out-of-lock delay, 00 to 99 minutes (refer to Table A-8).
S = Off if the out-of-lock function is deactivated, S = ZDL indicates zero delay.
Return DCXO Status
Command: SD
SD returns the DCXO (Digitally Compensated Crystal Oscillator) status, which compares the
oscillator with the 1 PPS to track the oscillator drift.
Response: ±pp.pp PPM
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Format: pp.pp = Residual, corrected DCXO error, in parts per million
EEPROM Status
Command: SE
SE returns the EEPROM status.
Response: T=t CE=ee
Format: t = 0, No Timeout Error; t = 1, Timeout Error
ee = Number of corrected errors in reading EEPROM data
Receiver Status
Command: SR
SR returns the current receiver status.
Response: V=vv S=ss T=t P=Off E=0
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Format: vv = number of satellites, visible to the antenna, per almanac.
ss = relative signal strength (range: 0 to 255, nominal value = 15)
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