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2.2
REAR PANEL CONNECTORS
General Description
For the Spectra radio, the modem uses the SB9600 interface
hardware.
The rear panel has all the connectors required for DTE and
radio connection (see Figure 3).
2.2.1
DTE to VRM 500
The modem can interface any DTE via one serial port that
has the following parameters:
• Baud rate set at 2400 bps (default)
• 8-bit data
• No parity
• One-stop bit
The baud rate can be modified to operate at 1200, 2400,
4800, or 9600 bps.
The modem provides two connectors for this type of
interface: a 9-pin D-type female connector for RS-232
levels, and a 8-pin Hirose QMIO-8R connector for CMOS
levels.
NOTE
The user can connect only one connector at a time.
2.2.2
Auxiliary to Modem
This RS-232 port is used for connecting external devices
such as a GPS (Global Positioning System) receiver, a bar
code reader, etc.
All signals from this port are RS-232 levels. The port also
provides a power line for accessing devices requiring a
power supply.
2.2.3
Radio to Modem
The modem is capable of operating Motorola radios such as
MaxTrac (parallel interface) and Spectra (serial interface).
3. POWER SUPPLY
Power for the modem is supplied directly from the radio.
The voltage level is 13.8 V±20%.
4. RECHARGEABLE LITHIUM BACKUP
BATTERY
The battery can back up the RAM for 10 days in case of
power failure and is fully charged in less than 50 hours.
5. USING THIS MANUAL
In addition to this section, this manual contains the
following information:
• The Lithium Battery Safety Precautions section lists
safety and replacement instructions for the lithium
battery.
• The Installation section lists the recommended
procedure for installing the VRM 500.
• The Functional Description section provides a
technical description of the electronic circuits.
v
• The Maintenance
&
Troubleshooting section
includes the information necessary to maintain the
VRM 500's specified performances.
@
CMOS
DTE
AUXILIARY
RADIO & POWER
@
68P02943C71
Figure 3. Rear Panel Connectors
3
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