CMG-DCM / AM - Güralp Systems Limited

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CMG-DCM Data Communications Module • Check that the DCM's HTTP(S) server is enabled by issuing one of gcfgdbset net.remoteaccess.allow.http yes gcfgdbset net.remoteaccess.allow.https yes as necessary. I cannot connect to the DCM's Scream! server. Make sure you are using UDP to connect to the DCM. Scream! servers between computers (including the DCM) always use UDP. The Add TCP server... option in Scream! is intended for hardware serial-to-IP converters only. I cannot GCFPING the DCM's Scream! server. • Check the Receive UDP data checkbox in Scream!'s Network Control window. • Open the DCM's Web site, and check that the option datatransfer.scream.server is set to on, and that datatransfer.scream.server.port is the port you expected. I can GCFPING the DCM's Scream! server, but no data appears. Check the DCM is receiving data by selecting Actions → Data Viewer on its Web site. This is a Java applet which provides some of the functionality of Scream!, allowing you to check that data is being received correctly. The streams being received at the DCM are listed in the bottom section of the applet. Click on a checkbox to add that stream to the main 40 Issue F
Operator's guide viewer window. If you do not want to use the DCM's Web site, you can find out the number of GCF blocks the DCM has received with the command gnblocks. Each serial port will be listed, with its name, number, key number and device name (as for serialmap) but including the number of blocks received on that port: Key 0x007005: Blocks 3287 (Port 5, name Port A (COM6), device /dev/ttyS2, baud 9600) The DCM is not receiving any data streams. • Check the connection between the digitizer and the DCM by trying to log in to the digitizer's console using any of the methods described in Section 3.4 (page 33.) Press ENTER a few times to initiate communication. • If the digitizer gives an ok prompt when you press ENTER, check that you have configured the digitizer to output real time data streams. Streams will not appear until a whole GCF block (1024 bytes) is ready for transmission, so a 5 sps stream may not appear until the digitizer has been working for 4 minutes. In addition, you can configure a digitizer to output only triggered streams, in which case it will not appear until a trigger occurs. (There is an exception to this: if you have put the digitizer in the FILING or DUAL filing mode, it will send heartbeat messages to Scream! clients every so often. The DCM will not show these messages in the Data Viewer.) • If the digitizer does not respond when you press ENTER, or produces garbage, check that the DCM is using the same baud rate as the digitizer. By default, digitizers use a baud rate of 9600, with 8 data bits, no parity bit and 1 stop bit, and no flow control. To change the DCM's settings, exit the terminal program, and either • access the DCM Web site, click on the Configure – Port link in the serial port table, and change the settings, or • issue configuration commands such as serial.5.service gcf_in serial.5.baudrate 9600 serial.5.handshaking none To obtain the port number (here 5) corresponding to a named port, use the command gnblocks. December 2006 41
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Operator's guide 9 Connector pinout
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Operator's guide 9.2 Integrated DCM
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CMG-DCM / AM - Güralp Systems Limited

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