Guralp Systems CMG-40TDE - Manual (Page 7)

Operator's Guide
1.1.2 NET
The NET port is a 100BASE-TX Ethernet connection. The supplied
cable supports connection to a hub, switch or router. If direct
connection to a PC or laptop is desired, an optional cross-over cable
can be ordered.
1.1.3 GPIO
The GPIO (General Purpose Input/Output) port fulfils three functions:
it provides a serial console to the EAM, which can be used for
monitoring, configuration and control; it provides USB access from a
PC or laptop to the internal FLASH storage for data collection (Use of
this feature is described in the EAM manual, MAN-EAM-0001 ) and it
provides a number of tri-state lines which can be used to control or
monitor external equipment. One application is as tamper detection
lines, which can be connected to external switches and monitors as
part of a secure installation.
1.1.4 USB
The USB port allows connection of an external USB storage device for
data collection. It is also possible to perform firmware upgrades using
this port in situations where internet access is not available.
1.1.5 GPS
The GPS port allows connection of a GSL GPS receiver for use as a
timing source for time-stamping seismic data. An additional serial
port, ttySA2, is also available on this connector. It can be used for any
of the functions listed above (in section 1.1.1).
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