Guralp Systems CMG-DCM - Manual (Page 122)

CMG-DCM Data Communications Module
where port and baud are in decimal, and Key in hexadecimal. The
related command serialmap -k returns the key ID in decimal.
Digitizer status
The Güralp DM24mk3 digitizer outputs status information as a
separate stream. If you have a DM24mk3, you can monitor this stream
with the command
dm24mk3cds -s port-number
Whilst this program is running, it will output any status blocks it
receives on that port directly onto your terminal:
HPA1CD: Wed Jun 30 14:51:13 2004
gps_fix=2 (0x32)
gps_mode=A (0x41)
gps_control=255 (on)
gps_power=255 (on)
gps_offset=167 ticks
busy_counter=0 ticks
locking=0 unlocking=0 centering=0
calibration V N E
The information given, after the stream ID (which will always end in
CD), is as follows:
•
a time-stamp for the status block;
•
whether the GPS has obtained a fix (0 = has not received any
data, 1 = has not obtained a fix, 2 = has obtained a 2D fix, and 3
= has obtained a 3D fix);
•
the mode the GPS is running in (A = automatic, and M =
manual);
•
whether or not the system clock is being controlled by the GPS
(255 = on);
•
whether the GPS is currently powered up (255 = on);
•
the current measured offset between GPS and the internal clock,
in units of 500 ns;
•
the current value of the “busy” counter, which counts down
towards zero whilst certain digitizer processes (such as
calibration) are active;
•
whether the sensor is currentlty being locked, unlocked, or
122 Issue F