Gps Channels - HBM SomatXR CX23-R User Manual

4 Setting up and running a test
48
SAE J1939 messages with a specific source address value and all non-J1939
messages, cause the unit to omit the mask, so that the specified message ID must
be matched exactly. The message ID value and mask determined by the unit are
shown in the Databases view as the "Message ID" and "Mask," respectively. The
Mask value will be blank if masking is not being used (that is, if the CAN message
IDs must match exactly).
4.3.5 GPS channels
GPS channels are sourced from the GPS connector on a data processor. EGPS-
200, EGPS-200-Plus and Garmin GPS modules are supported.
The Garmin GPS (model GPS18X-5Hz) module requires the 5 Vdc power option and
draws about 0.5 W. EGPS-200 and EGPS-200-Plus modules require the 12 Vdc
power option and draw about 2.4 W. On boot up of the SomatXR/eDAQXR system,
the power is always set to 5 Vdc.
With the power option set to 5 Vdc, the EGPS-200 and EGPS-200-Plus modules
operate in a minimal mode that is sufficient to send a message to the
SomatXR/eDAQXR data processor allowing it to identify the module. When the data
processor receives this message, it switches to the 12 Vdc power mode.
CAUTION
The Garmin module can be instantly destroyed if it is connected to the GPS
connector with the 12 Vdc power option selected! As such, always power off the
SomatXR/eDAQXR system before connecting a Garmin GPS if an EGPS-200 or
EGPS-200-Plus module was previously connected.
All GPS modules source standard NMEA sentences that provide GPS fix position,
fix quality, fix date and time and other standard navigational parameters.
NOTE
Position accuracy varies with several factors including, but not limited to, GPS
receiver configuration, location (geographic latitude, as it influences HDOP, and
surrounding objects possibly blocking reception or causing multi-path reception),
satellite constellation status and ionosphere conditions.
The Garmin GPS module also sources dilution of precision parameters (i.e.,
positional, horizontal and vertical). All Garmin channels are sourced at 5 Hz.
Both the EGPS-200 and EGPS-200-Plus modules source proprietary NMEA
sentences that provide IMU information (i.e., tri-axial acceleration and vehicle
yaw rate, roll rate and pitch rate). Both also provide a high accuracy 3D Speed
computed channel. All of these channels are sourced at 200 Hz.
The EGPS-200-Plus module additionally sources real time kinematic (RTK)
parameters (i.e., yaw and pitch) using two antennae that must by properly and
accurately mounted on the vehicle. These additional channels are sourced at 20
Hz.
All modules provide GPS PPS time sync pulses that allow the SomatXR/eDAQXR
system to align the GPS channel data to be synchronized in phase with other
SomatXR/eDAQXR channels (i.e., analog and digital input channels).
a4275-8.0 en HBM: public CX23-R and EX23-R