Installation; Programming The Modem - Ritron DTXM II Series User Manual

4.5

INSTALLATION

The DTXM modem has two connectors, a BNC for the RF (Antenna) connection and a 15-pin D-
subminiature for the data/programming interconnection. The BNC connector should be connected to a
suitable antenna or RF dummy load or attenuator, depending upon the installation. If an antenna is
connected, it should be placed at least 10 ft. away from the radio itself to prevent RF interference. Also, any
antenna must present a good 50-ohm RF load (low VSWR) at the operating frequency. The 15-pin
connector is usually used with a Ritron programming cable which provides for DC power connections and
a serial connection for programming and for the data to transmitted and received.
5.0

PROGRAMMING THE MODEM

The operating parameters of the DTXM modem can be set and adjusted via the Ritron DTXM-X60 series
programmer, DTXM2-PCPS. Note that the programmer for the previous Ritron wireless modem, i.e. the
DTXM-X54 series will NOT work with this product.
The programming software should be loaded on a host computer by loading the CD-ROM disc into the host
computer's appropriate drive. The programming software itself should be self-extracting. If it does not load
automatically, it can be manually loaded by running "Setup.exe" on the CD Rom.
The Ritron modem should be connected to the host computer by the 9-pin connector. The red wire in the
cable should be connected to positive supply voltage for the modem while the black should be connected to
the negative side. The voltage itself should be compatible with that required by the modem. In
programming mode, the current required by the modem is about 150 mA and the power supply should be
capable of supplying that current. Note that in transmit, it can be much, much higher, 2 to 3 amperes is not
unusual. It is possible to transmit with the programmer program running, but the power supply must be able
to supply the necessary current and a suitable RF load must be provided on the BNC connector. Once the
modem is connected to the host computer and a power supply is connected, the programming software
program can be opened and the power supply turned on.The first screen to become visible is the "welcome"
screen shown below:
.