User's Manual

16 MDS TransNET I/O Guide MDS 05-2708A01, Rev. A
Invisible place holder
Figure 13. Transceiver interface connector pins
As viewed from outside the radio
NOTE: The data cabling between the transceiver and the connected device
should be kept as short as possible. Cable runs over 50 feet (15
meters) may require the use of EIA-422 signaling. Consult the
factory for details.
4. Measure and install the primary power for the transceiver. It must be within
5–24 Vdc* and be capable of furnishing up to 500 mA. Be sure to observe
proper polarity. The red wire on the power cable is the positive lead; the
black is negative.
NOTE: The radio is designed for use only in negative ground systems.
The power supply used with the transceiver should be equipped
with overload protection (NEC Class 2 rating), to protect against a
short circuit between its output terminals and the transceiver power
connector.
5.2 Peer-to-Peer Systems
Peer-to-peer systems allow remote radios to communicate with each other as
well as with the master station. The paragraphs below describe two types of
peer-to-peer systems—simplex and repeater assisted.
Simplex Peer-to-Peer
A simplex peer-to-peer system is one in which all radios use the same transmit
and receive frequencies. This is also known as single-frequency operation. A
simplex arrangement is the simplest configuration for peer-to-peer systems,
but it usually has limited transmission range because of the need for all stations
to use omnidirectional antennas.
With a simplex peer-to-peer system, there are three key items to remember:
Programming To program a system for simplex operation, the master radio must
be set to
SIMPLEX ON (Page 33). This setting is automatically applied
to all remote radios as soon as they become synchronized with the
master radio.