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G.2.4 COMn_DTR
This command enables versatile control of the DTR handshake line [control (high, low or toggle), active (high or
low), lead time and tail time] for use with output data logging in conjunction with external devices such as a radio
transmitter. The default state for the COM1 or COM2 DTR line is always high.
Examples:
com1_dtr toggle,high,300,150
com2_dtr toggle,low,200,110
G.2.5 COMn_RTS
This command enables versatile control of the RTS handshake line [control (high, low or toggle), active (high or
low), lead time and tail time] for use with output data logging in conjunction with external devices such as a radio
transmitter. The default state for the COM1 or COM2 RTS line is always high. COMn_RTS will not influence the
COMn command handshake control of incoming commands.
Example:
com1_rts toggle,high,200,100
com2_rts toggle,low,250,125
G.2.6 DATUM
This command permits you to select the geodetic datum for operation of the receiver. If not set, the value is
defaulted to WGS84. Refer to Table G-2 in Appendix G of the MiLLennium Command Descriptions Manual 4.50
for a complete listing of all available predefined datums. See the USERDATUM command in the MiLLennium
Command Descriptions Manual 4.50 for user definable datums. The datum you select will cause all position
solutions to be based on that datum (except PXYA/B which is always based on WGS84).
Syntax:
DATUM
option
Syntax
Datum Option
DATUM
any one of 63 predefined
datums
USER
a. In the MiLLennium Command Descriptions Manual, the units of the X, Y and Z datum rotation angles are
shown to be arc seconds when in fact they are radians.
Example:
datum tokyo
NOTE:
The actual datum name must be entered in this command as listed in the NAME column of Table G-2
in the MiLLennium Command Descriptions Manual 4.50. Also note that references to datum in the
following logs use the GPSCard Datum ID#: MKPA/B, PRTKA/B, POSA/B and RTKA/B.
The DATUM PZ90 command will use the default values as set to those published by Misra et al. (ION GPS 96, pg
307), see Page 82 for more information. To define the values you must issue the PZ90TOWGS84 command (see
"G.1.2 PZ90TOWGS84", Page 82). The PZ90 transform parameters can be saved in user-configurable memory
for immediate use on powerup.
GPSCard Datum
NAME
ID number
64
PZ90
* See the PZ90TOWGS84 command ("G.1.2 PZ90TOWGS84", Page 82) for more information
Example:
datum PZ90
GPS/GLONASS Receiver User Manual Rev 1
For a list of 62 predefined datums, refer to Table G-2 in Appendix G
of the MiLLennium Command Descriptions Manual 4.50. To see the
63rd predefined datum, refer to the table below.
User defined datum with parameters specified by the USERDATUM
command (Default WGS84)
Sets the system datum to Tokyo
DX
DY
DZ
0
2.5
0
Sets the default PZ90 values for the output position parameters
G GLONASS Commands
Description
DATUM DESCRIPTION
Parameters of Earth 1990*
Default
WGS84
a
ELLIPSOID
Parameters of Earth 1990*
85
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