Specifications

MOBILE EQUIPMENT
Vehicular Radio Modem 500
R4-11-4G Equipment Descriptions 4-25
4.3 Mobile Equipment
Modems certified for Private DataTAC 2.0.3 use an enhanced roaming
algorithm to reduce channel reacquisition time. Modems in this release also
are enhanced to support FullVision INM performance monitoring and
RD-LAP rate agility.
This section describes the models, options and accessories for the VRM-500,
VRM 650, VRM 660, Mobile Workstation 300, Mobile Workstation 350, and
the Mobile Workstation 520™ (MW-520).
Mobile computer configurations allow field user applications to access
customer computers. This variety of wireless computer configuration
provides flexibility to meet customer needs.
The system designer can choose the following mobile hardware applications:
• Mobile Workstation 520™ (MW-520) with built-in radio modem
• MW-520 with a vehicular radio modem (VRM)
• Notebook with a VRM
4.3.1 Vehicular Radio Modem 500
The VRM-500 is an external radio modem and is paired with a data capable
Motorola MCS 2000® mobile radio optioned for RD-LAP data service.
F2054 • VRM-500 RADIO MODEM
F2054 is for use on private radio channels. The VRM-500 can be dash or remote
mounted, but must be within the proximity of the radio to which it is
connected.
There are five LED indicators on the front panel, one for power and four for
status. Located on the back of the VRM-500 are two different connector
inputs for data terminals: one providing RS-232 voltage levels and the other
compatible with Complementary Metal-Oxide Semiconductor (CMOS) 0-5v
levels. The RS-232 is supported via a DB9-F connector and the CMOS is
supported by a Hirose QM10-8R connector. A DB-9 male connector provides
access for GPS inputs. Option Z167 enables the port and software to handle
the GPS messages. A 13-pin Hirose RP13A connector interfaces to the
external radio.
Included are install hardware with bracket (FRN5755) and the VRM-500
Owner’s & Installation Manual. The VRM-500 requires one of two RF
protocols to be specified at the time of order (J819 - RD-LAP 9.6 kbps
protocol, or J829 - RD-LAP 19.2 kbps protocol). Modem-to-radio cables are
available for the MCS 2000® mobile radios with the data operation option
(H44).
NOTE:
The H44 is not available as a field upgrade.