ashtech DG14, Reference Manual

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18 DG14 and DG16 Board & Sensor Reference Manual
Firmware Upgrades
DG16 firmware is stored in flash memory. New firmware may be loaded into the
receiver through either serial port using a PC. Maintenance releases of firmware
are available on a regular basis to fix known bugs and to implement new features.
When embedding the DG16 within another system, Thales Navigation
recommends that external access to one of the receiver’s serial ports be
designed into the system for direct monitoring. For example, many system
integrators use an internal data cable to connect one of the DG16 serial ports to
an external DB9 connector.
If you have purchased the User Defined Messaging option [X], then you can use
the UDM Utility program to create the script file which defines the custom
messages. You can use the custom message feature to set the receiver to output
only the information you need in a single message. This can save you from
sending several receiver commands. See Appendix A,
UDM Utility for more
information.
CAUTION
Take the following precautions to avoid damaging your DG16 Board:
1. The power supply should be turned off each time the I/O-Power cable is connected to or
disconnected from the J301 connector.
2. Ensure that when connecting the I/O-power cable to connector J301, pin 1 is correctly
oriented per Figure 1.1.
3. Connect pin 15 (BATT_IN) to ground if it is not being used. Pin 17 (MAN_RES) should be left
open if it is not being used.
4. Isolate the center pin on the DG16 antenna connector from DC ground. The DC block used
between the center pin and DC ground should have the following characteristics:
• 1.15 maximum VSWR @ 1575 Mhz
• 0.2 db maximum insertion loss
• 5 VDC maximum main line voltage
5. Connect the RAM back-up battery to the appropriate pins on connector J301 and set the SAV
parameter to Y.