Guralp Systems CMG-DCM build <10,000 - Manual (Page 192)

CMG-EAM (Platinum Firmware)
The digitiser module also exposes a dedicated console connection,
which is internally attached to Port B of the acquisition module. This
can be accessed from the command line of the acquisition module or,
if desired, made accessible over the network. If you wish to disallow
network access, set the service on the EAM's Port B to “none”. To
enable access over the network, set the service on the EAM's Port B to
“TCP serial converter. Serial data to TCP link converter” and configure
the converter according to the instructions in section 6.7 on page 74.
It is currently possible to set the Baud rate of the digitiser's console
port and of the EAM's Port B independently, leading to a loss of data
communication between the two modules if the two do not match. If
you wish to have a higher transfer rate between the two modules, both
ends must have their Baud rates increased separately. The digitiser
module's Baud rate must be changed first.
Port C of the acquisition module is used for synchronisation and can
either provide NMEA to the digitiser module or share incoming GPS
data from an external receiver. Different internal connections are used
in each case: an analogue switch is controlled by the service selected
for the EAM's Port C.
When the Port C service is set to “NMEA In”, the connections are as
follows:
Incoming data from an external GPS receiver is available to both the
digitiser and acquisition modules. Both the digitiser's GPS input and
Port C of the acquisition module must run at 4,800 Baud. This should
never be changed.
192 Issue C