Operation Manual

1 Getting Started
2 SiteNet 450 Operation Manual
1.1 Introduction
The SiteNet 450 radio-modem broadcasts raw GPS data in Compact
Measurement Record (CMR) format from a reference receiver to one
or more roving receivers for precise machine positioning.
The SiteNet 450 is compatible with Trimble’s TRIMTALK™ 450 and
TRIMMARK™ radios for broadcasting and receiving Radio
Technical Commission for Maritime Services (RTCM) or CMR data.
Trimble recommends that you use the CMR+ format whenever
possible.
1.2 Hardware Specification
The SiteNet 450 meets stringent hardware requirements, such as the
Caterpillar EC-1 specification. The SiteNet 450 features:
• Integrated low-profile antenna for machine installations.
• Physical connection by means of the same 8-pin male Bendix
connector previously used on TRIMCOMM™ radios. For a
description of the connector pinout, see Pinout Information,
page 44.
In addition, the SiteNet 450 is designed for use with unconditioned
power 10.5 VDC to 20 VDC.
In a SiteVision™ GPS system or a BladePro 3D® GPS system,
12 VDC is provided through the Trimble GPS receiver, using the
standard SiteNet 450 machine cable.
Note – As used in this manual, CMR as well as CMR Plus formats are
both represented by CMR.
SN450.book Page 2 Friday, October 5, 2001 5:01 PM