Guralp Systems Scream - Manual (Page 12)

Scream! 4.5
2. The serial ports available to Scream! are listed in the table.
Identify each port, and the instrument connected to it.
If you are using Microsoft Windows, the Port number
corresponds to the COMn number of the serial port. If you are
using Linux, Port numbers 1 – 64 refer to the built-in serial ports
/dev/ttyS0 – /dev/ttyS63. Ports 65 and above refer to
USB-connected serial ports beginning /dev/ttyUSB0.
A port may not be listed if it is not installed, suitable drivers are
not available or if another program is using it. Scream! scans
your computer for new ports each time you open the Setup
window. To make Scream! scan the ports again, click the Port
column heading.
3. Configure each port according to the settings of the instruments
connected to them:
Baud Rate : The speed of the serial link to the instrument. The
current digitiser product range defaults to 38,400 baud. Older
3-channel Güralp digitisers default to a speed of 9,600 baud;
6-channel digitisers use 19,200 baud; EAM units use a baud rate
of 115,200 by default. If you do not know the baud rate of your
digitiser's output port, select Auto-Detect from the drop-down
menu to have Scream! attempt to detect it for you. The
instrument must be producing data for this to work.
You can set all ports to the same baud rate by clicking on the
column heading and choosing a suitable value from the
drop-down menu.
If you are using Scream! for real time data, you will not need to
change any of the remaining settings.
AutoBaud : Once connected, Scream! dynamically alters its
baud rate to fit with the instrument to which it is connected.
However, this can interfere with transmission over very noisy
links. If you have problems, clear this box.
ACKs : Whether Scream! should send Acknowledged messages
to this instrument.
NACKs : Whether Scream! should send Not Acknowledged
messages to this instrument, when it detects a failure in
transmission.
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