Specifications

EXTERNAL RADIO MODEMS
VRM-500
R4-11-4G Wireless Data Communications Network 1-17
simplifies unit installation and saves space. Modular construction allows
quick separation for servicing.
The internal radio configuration supports both RD-LAP 9.6 kbps and RD-
LAP 19.2 kbps on the F5203 model.
1.6 External Radio Modems
External radio modems allow mobile computers to communicate in a Private
DataTAC 2.0.3 network. The power supply for the VRM-500, VRM 650, and
the VRM 660 is the vehicle’s battery. The PRM 660 uses either its internal
battery or external vehicle power.
A Global Positioning System (GPS) Trimble® Placer™ 450 receiver can be
connected to the VRM-500 or the VRM 650 auxiliary (AUX) interface port as
part of an AVL application. The VRM and Private DataTAC network serve as
a transparent communications pipe between the AVL application running in
the host and the GPS receivers in the vehicles.
NOTE
AUX port cannot be used for GPS when DTE runs
MWCS II and enables complementary services.
These subsections describe the following Private DataTAC radio modems:
• VRM-500
•VRM 650
•VRM 660
•PRM 660
1.6.1 VRM-500
The VRM-500 is an external radio modem and is paired with a data-capable
Motorola MCS 2000® mobile radio option for RD-LAP data service.
1.6.2 VRM 650
The VRM 650 is an integrated radio modem based on the Motorola
MCS 2000 mobile radio in a compact, self-contained unit built in a die-cast
aluminum chassis. The VRM 650 is designed for dedicated, data-only
applications. These models are available in the 800 MHz, 900 MHz, and UHF
bands. The VRM 650 is dash or remote-mounted.
1.6.3 VRM 660
The VRM 660 is a compact, integrated radio modem in a self-contained unit
built in an aluminum chassis. The VRM 660 is designed for dedicated, data-
only applications. This modem has features and functions similar to the
VRM 650, but with reduced power and no AUX port.