Guralp Systems CMG-3EX-EAM - Manual (Page 11)

Operator's Guide
5 USB Operations
The CMG-3EX-EAM can function as both a storage device, available
for access from a USB connected PC, and as a USB host, writing to
external USB storage devices such as memory sticks and USB disks.
When used as a USB storage device, the GPIO connector is employed.
When acting as a host, the USB connector is used. The pin-outs of
both these connectors are given in the appendices of MAN-EAM-0001.
5.1 USB device mode
The CMG-3EX-EAM is fitted with an internal Flash memory device
which is accessible via USB. It can be written to by selecting “Internal
USB storage” from the “Recording destination” drop-down menu on
the “Disk recording” menu (see section 10.2 of MAN-EAM-0001).
When a USB host, such as a laptop or PC, is connected to the GPIO
port internal circuitry detects the USB power and automatically
connects the Flash memory to the USB socket, causing it to behave
identically to a standard USB memory stick.
When no power is detected at the USB port, the Flash memory is
available to the system as if it were a standard removable disk. All of
the disk recording options described in section 10.2 of MAN-EAM-
0001 will apply to this device.
5.2 USB host mode
If a USB storage device is connected to the USB port, it will be
mounted under /media. It can be used to store seismic data by
selecting “External USB drive on mil-spec connector” from the
“Recording destination” drop-down menu on the “Disk recording”
menu, described in section 10.2 of MAN-EAM-0001.
May 2010 11