Guralp Systems Scream - Manual (Page 88)

Scream! 4.5
usually be sufficient. If you wish to transmit 200 Hz data, however,
the baud rate must be at least 19,200.
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It must be low enough to fit within the operating range of the
telemetry equipment you are using. While modern modems often
offer transfer rates up to 56 kBaud, the telephone or transmission
lines may not support these rates. The same holds true for radio
telemetry.
Usually, the transmit and receive rates of the data port will be the
same. If not, you may select different data rates by clearing the
Identical TX/RX rates check-box.
The Stop Bits option allows you to choose whether the serial link uses
one or two stop bits. In most cases this can be left at one, although
two may be required if you are sending data over ‘difficult’
transmission lines (for example, some types of radio link). Using two
stop bits will add a 10% overhead to the data.
You will also need to set the data rate for Scream's local serial port, as
well as for the NAM/EAM/DCM or other communications device (if
you are using one). In Scream!, you can configure a serial port by
right-clicking on its icon (not that of the digitiser) and selecting
Configure… from the pop-up menu: see Section 3.1 on page 11. If you
are using an additional communications device, you should consult its
documentation to learn how to set its baud rate.
88 Issue K