GeoSIG Ltd.
GS_GSR_GCR_UserManual_V21.doc / 18.09.2009
Page 12
GSR / GCR / AS User Manual
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Packet Oriented Mode (POM): After logout, every second a one-second buffer is sent to the
communication line (GSBU – GeoSIG / Bergen University – protocol).
a
For recording and analysing on the PC, besides GeoDAS, data acquisition software SEISLOG,
and data analysing software SEISAN can also be used.
Please refer to the web site of University of Bergen:
http://www.geo.uib.no/Seismologi/software/software.html
for further and up to date information on these software.
4.4.1.1. Sample Oriented Mode (SOM)
Set-up:
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Connect the cable from the PC to the RS-232 connector on the Instrument.
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Log in to the Instrument.
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Please refer to the GeoDAS manual for further steps.
Starting the serial data mode:
After logging out, the Instrument starts automatically the serial data mode after 2 seconds.
Stopping the serial data mode:
After logging in to the Instrument, the serial data mode automatically stops and remains off for the time
being logged in.
Data format:
8 bytes are sent with each sample to the COM port:
Byte 1, sync byte:
0xyy (user programmable with
the communication program)
Byte 2, data byte 1:
x high
Byte 3, data byte 2:
x low
Byte 4, data byte 3:
y high
Byte 5, data byte 4:
y low
Byte 6, data byte 5:
z high
Byte 7, data byte 6:
z low
Byte 8, Aux. byte:
Parity check of the above data bytes
Data format is signed binary (2s complement, 16 most significant bits).
Parity check byte is defined as in Table 1.
Table 1. Definition of the parity check byte
0b 00xx xxxx
¦¦ ¦¦¦¦
¦¦ ¦¦¦+--- Bit is set, if data byte 1 has odd parity
¦¦ ¦¦+---- Bit is set, if data byte 2 has odd parity
¦¦ ¦+----- Bit is set, if data byte 3 has odd parity
¦¦ +------ Bit is set, if data byte 4 has odd parity
¦+-------- Bit is set, if data byte 5 has odd parity
+--------- Bit is set, if data byte 6 has odd parity
Baud Rate:
The transmission baud rate depends on the settings made via GeoDAS (refer to the GeoDAS manual
for further explanation). Available rates are listed on Table 2.
