CMG-DCM
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
•use the Serial port configuration → port name Web page, 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, issue the command serialmap.
•If the digitizer is not responding at all, check the power supply to the digitizer and the cable between it and the DCM.
The DCM is receiving streams, but they do not contain any data.
If the data you see is zero:
•
•
Increase the Y axis scale using the 
icon in Scream!'s Waveview window or the corresponding icon in the DCM's Data Viewer.
Check the mass position outputs to see if the masses are locked. A properly unlocked and centred mass should show a mass position within 1000 counts of zero; a locked mass will give a value in the region of 32,000 or −32,000 counts. If your sensor has remote mass locking, you can unlock the masses by navigating to Actions → Digitizer setup and clicking Unlock sensor.
Locking or unlocking the sensor mass typically takes several minutes to complete.
•Check the connection between the sensor and digitizer and try again.
If you cannot see the data in the stream, remove any constant offsets by clicking
on the Zero streams icon 
in Scream!'s Waveview window or the DCM's Data Viewer.
38 | Issue A |