Trimble Standard Interface Protocol

A

Alternatively, the unit will accept a 40 byte input packet containing 5 double-precision floating point values representing the ellipse. The first 3 are DX, DY, and DZ, which represent an offset in meters from the ECEF origin for the ellipse. The fourth parameter is the semi-major axis of the ellipse (called the a-axis) and is also in meters. The fifth parameter is the eccentricity of the ellipse and is dimensionless.

"Caution – The GPS receiver does not perform an integrity check on the datum values. If unusual inputs are used, the output will be equally unusual.

Table A-72 Command Packet 8E-14

Byte #

Type

Value

Units

 

 

 

 

0

Superpacket ID

0x14

 

 

 

 

 

1-8

DOUBLE

DX

meters

 

 

 

 

9-16

DOUBLE

DY

meters

 

 

 

 

17-24

DOUBLE

DZ

meters

 

 

 

 

25-32

DOUBLE

A-axis

meters

 

 

 

 

33-40

DOUBLE

Eccentricity

None

 

 

Squared

 

0x8E-15

Command Packet 8E-15

Request Current Datum Values

This packet contains only the subpacket ID, 0x15. The response to this packet is 8F-15.

A-88

Acutime 2000 Synchronization Kit User Guide

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Trimble Outdoors Part Number 45005-00-ENG manual 0x8E-15, Request Current Datum Values, Table A-72 Command Packet 8E-14