Guralp Systems CMG-DCM build <10,000 - Manual (Page 15)

Acquisition Modules and Platinum Firmware Equipment Overview
2.5.4 GPIO
The 12-pin 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. This is permanently configured
to run at 38,400 baud;
•
It provides USB access from a PC or laptop to the internal FLASH
storage for data collection (use of this feature is described in section
11.3.3 on page 161); 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.
2.5.5 USB
The 6-pin 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 – see section 5.3.3 on
page 59 for details.
2.5.6 GPS
The 10-pin GPS port allows connection of a GSL GPS receiver for use as a
synchronisation source for time-stamping seismic data.
2.5.7 Power/Data
The 10-pin Power/Data Out port is a power input and also a general-purpose
serial port which can be used for GCF output (suitable for serial connection to
Scream), PPP network connections, inbound GCF (from a digital instrument,
for example), NMEA functions, TCP serial conversion, a modem answering
service or as a recorder to store and forward data from any instrument with a
serial output.
2.5.8 POWER
The 4-pin Power port, where fitted, is an alternative power input. It can be
used as a permanent power input in situations where the Power/Data port is
only used occassionally.
2.6 Typical Applications
2.6.1 Autonomous remote data-logger
In this application, depicted below, a CMG-EAM is used to collect data from a
digital instrument (or analogue instrument and digitiser) and store it on its
MAN-EAM-0003 15 Issue E - February 2014