Guralp Systems CMG-DM24 - Manual (Page 43)

Operator's guide
If a tick is placed in the box next to a channel, its data will be collected
and transmitted as a data stream in GCF format, just as with the
normal data channels. To indicate that the data comes from a Mux
channel, the Stream ID will take the form ****Mx, where M stands for
Mux and x is a hexadecimal integer (i.e. 0 – 9, and A – F for 10 through
15). Z, N/S and E/W Mass Position Mux channels appear as M8, M9 and
MA respectively.
Ports
The Baud Rates pane of the Configuration setup window allows you to
program the baud rate and stop bits for the DM24's output port.
The baud rate you choose must satisfy two conditions:
•
It must be high enough to allow all the transmission of all data
generated by the digitizer at the sampling rates you have
chosen. For three streams of data at 100 Hz, for example, 9600
baud will usually be sufficient. If you wish to transmit 200 Hz
data, however, the baud rate must be at least 19200.
•
It must be low enough to fit within the bandwidth of the
communications infrastructure you are using. While modern
modems often offer transfer rates up to 56k baud, the telephone
or transmission lines may not support these rates. The same
holds true for radio communication links.
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