Güralp DM24 digitisers are available in three-channel and six-channel versions. (Both actually have an additional full-specification input channel so you may also see them referred to as four-channel and seven-channel units.)
A six-channel DM24 can be configured to appear either as a single six-channel system, with a single System ID and Serial Number (used to identify the streams), or as two virtual three-channel digitisers, sharing a single System ID but with two separate, distinct Serial Numbers. The only differences between the two modes are the names of the resulting output streams.
This document explains how to configure each of the modes and how to switch between them. Read more...
