Guralp Systems CMG-DCM build <10,000 - Manual (Page 178)

Acquisition Modules and Platinum Firmware Transmitting Data
Channels should be specified by giving their system ID and their stream ID,
separated by a hyphen ('-').
Clicking the button on any row will open a new row. In the same way,
rows can be deleted by clicking the corresponding button.
12.1.4.2 Configurable parameters in expert mode
The following additional configuration parameters are in expert mode:
Advanced
V4.0 COM names: Early versions of the Scream protocol expected all data to
originate from COM ports and the port number was used to identify data
sources. Version 4.5 and above of the protocol allow for a much more flexible
naming scheme. The check-box can be cleared to enable advanced naming or
ticked to retain compatibility with earlier versions of the protocol.
Node name: The protocol includes a description field identifying the source
of each block. By default, this is set to the host name of the originating
machine but it can be over-ridden by entering a value in the field.
Log file: It may sometimes be desirable, for debugging purposes, to separate
log messages for this transmitter from the standard system log. The text field
MAN-EAM-0003 178 Issue E - February 2014