Guralp Systems CMG-CD24R8 User Manual
CMG-CD24R8
User's G ui de
Part No. MAN-C24-0004
Designed and manufactured by
Güralp Systems Limited
3 Midas House, Calleva Park
Aldermaston RG7 8EA
England
Proprietary Notice: The information in this manual is
proprietary to Güralp Systems Limited and may not be
copied or distributed outside the approved recipient's
organisation without the approval of Güralp Systems
Limited. Güralp Systems Limited shall not be liable for
technical or editorial errors or omissions made herein,
nor for incidental or consequential damages resulting
from the furnishing, performance, or usage of this
material.
Issue B 2012-08-10
CD24-R8
Table of Contents
1 Introduction.............................................................................................................. 3
2 Getting started.......................................................................................................... 4
2.1 Hook-up diagrams.............................................................................................5
2.1.1 Single CD24-R8 with USB connection......................................................5
2.1.2 Single CD24-R8 with RS232 connection...................................................5
2.1.3 Single CD24-R8 with Ethernet connection................................................6
2.1.4 Multiple CD24-R8s without an EAM-R – USB connection.......................6
2.1.5 Multiple CD24-R8s without an EAM-R – Ethernet connection................7
2.1.6 Multiple CD24-R8s with an EAM-R...........................................................8
2.2 Adjustable Gain................................................................................................. 9
3 Digitiser configuration...........................................................................................10
3.1 Configuration using an EAM........................................................................... 10
3.2 Configuration using Scream............................................................................10
3.3 Configuration from the command line...........................................................10
4 Configuring networking......................................................................................... 11
4.0.1 Using DeviceInstaller............................................................................... 11
4.0.2 Using DHCP..............................................................................................14
4.0.3 Configuration with the Web interface.....................................................14
5 Connector pin-outs................................................................................................. 16
5.1 Front panel....................................................................................................... 16
5.1.1 Inputs A to H............................................................................................ 16
5.2 Rear panel........................................................................................................ 17
5.2.1 Power........................................................................................................ 17
5.2.2 GPS...........................................................................................................17
5.2.3 DATA........................................................................................................ 18
5.2.4 USB........................................................................................................... 18
5.2.5 ETHERNET...............................................................................................19
5.2.6 GPS In/Out................................................................................................19
5.2.7 Inputs........................................................................................................20
6 Revision history...................................................................................................... 21
2 Issue B
User's Guide
1 Introduction
The CMG-CD24R8 is a rack-mounted, eight-channel, general purpose
digitiser, featuring:
• 24-bit sigma-delta analogue to digital converters;
• Low power: < 6W from 12V–15V DC;
• ±10V balanced differential input lines, connected to front or rear;
• GCF format output over serial cables, USB or Ethernet; and
• Multiple user-configurable output rates.
Once it is provided with 12 – 15 V power, the CD24 will begin
operating automatically, digitizing its input signals and either
outputting them to your own recording system, or saving them into
internal Flash memory. Accurate timing information can be taken
from a GPS receiver and multiple CMG-CD24R8s can be synchronised
to a single receiver.
The CMG-CD24R8 can be configured using either a CMG-EAM or
Scream, GSL's free monitoring and configuration software. If neither
are available, the on-board command line interpreter allows complete
control and configuration of the digitiser via a serial or telnet link.
August 2012 3
CD24-R8
2 Getting started
The following steps will enable you to connect and start using your
CMG-CD24R8.
1. Connect your sensors (or other ±10V differential sources) to
either the front-panel or rear-panel inputs. See section 5.1.1 on
page 16 for the front-panel input pin-outs and section 5.2.1 on
page 17 for the rear-panel input pin-outs.
2. If using a single CMG-CD24R8, connect your GPS receiver to the
GPS input on the rear panel. This connector provides power to
the GPS receiver and accepts NMEA and PPS inputs from the
receiver to provide synchronisation.
3. If using multiple CMG-CD24R8s, connect your GPS receiver to the
GPS input on the rear panel of the first digitiser. Connect a GPS
“daisy-chain” cable (part number CAS-PEP-0045) between the
GPS IN/OUT connectors of all digitisers to distribute the
synchronisation signals.
4. Provide a data output connection as follows:
(a) If used with a CMG-EAM-R, connect a USB cable between the
USB connector on the rear panel and a USB port on the CMGEAM-R
(b) If used without a CMG-EAM-R, connect either:
i. a serial cable between the DATA connector on the
rear panel and a serial port on a PC or laptop;
ii. a USB cable between the USB connector on the rear
panel and a USB port on a PC or laptop; or
iii. a network cable between the ETHERNET connector
on the rear panel and a network port on a switch, PC
or laptop.
5. Connect the supplied power adapter to the POWER connector on
the rear panel.
The hook-up diagrams on the following pages show the most common
usage scenarios.
4 Issue B
User's Guide
2.1 Hook-up diagrams
Please note that only one of the connectors ETHERNET, USB and
DATA can be used at any one time. A connection to the DATA port
disables the ETHERNET and USB connectors. A connection to the
USB port disables the ETHERNET connector.
2.1.1 Single CD24-R8 with USB connection
The USB connector on the CD24-R8 can be connected directly to a
USB port on a PC or laptop.
The PC or laptop will see the CD24-R8 as a serial device on the USB
bus and the operating system will allocate a COM port to it. The
CD24-R8 can then be accessed using Scream (File Setup Com→ →
Ports).
If the PC does not recognise the CD24-R8 as a virtual COM port, you
can download drivers from http://www.ftdichip.com/Drivers/VCP.htm
2.1.2 Single CD24-R8 with RS232 connection
The DATA connector on the CD24-R8 can be connected directly to a
serial port on a PC or laptop.
August 2012 5
CD24-R8
The CD24-R8 can be accessed directly using Scream (File Setup → →
Com Ports). The default line speed for the DATA connector is 115,200
baud. This rate is suitable for all common usage scenarios and should
not normally be changed.
2.1.3 Single CD24-R8 with Ethernet connection
The ETHERNET connector on the CD24-R8 can be connected to your
LAN via a network hub or switch. Most modern PCs and laptops also
allow a direct connection between the CD24-R8 and the Ethernet port
without an intervening hub or switch.
The network interface is implemented using a Lantronix WiPort-NR
module. To configure the network settings, please see Chapter 4 on
page 11.
To view the digitiser's output in Scream, open the Network Control
window ( + ) and add a new TCP server on port 10,002.
2.1.4 Multiple CD24-R8s without an EAM-R – USB connection
Multiple CD24-R8s can be connected to a single PC or laptop using a
USB hub. The individual units will appear as separate COM ports and
can be accessed from Scream as described in section 2.1.1 on page 5.
If the PC does not recognise the CD24-R8 as a virtual COM port, you
can download drivers from http://www.ftdichip.com/Drivers/VCP.htm
The GPS receiver should be connected to only one CD24-R8. A GPS
“daisy-chain” cable is used to pass timing information to other units in
the rack.
The CD24-R8s are supplied with separate power supplies but, if a
suitable DC power source is available, a “daisy-chain” power supply
cable can be made up to run all the units from a single supply.
6 Issue B
User's Guide
2.1.5 Multiple CD24-R8s without an EAM-R – Ethernet connection
Multiple CD24-R8s can be connected to a single PC or laptop using an
Ethernet hub. The individual units will appear as separate network
devices and can be accessed from Scream as described in section 2.1.3
on page 6.
August 2012 7
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