User's Manual

05-3946A01, Rev. C TransNET OEM Integration Guide 33
4. Multiple transceiver systems can co-exist in proximity to each other with
only very minor interference as long as they are each assigned a unique
network address. Each network address has a different hop pattern.

Additional RF isolation can be achieved by using separate directional
antennas with as much vertical or horizontal separation as is practical.
Vertical separation of antennas is more effective per foot/meter than
horizontal.
5. If constant interference is present in a particular frequency zone, it may
be necessary to “lock out” that zone from the radio’s hopping pattern.
The radio includes built-in tools to help users remove blocked frequency
zones. Refer to the discussion of the
SKIP command (Page 53) for more
information. In the USA, a maximum of four zones may be skipped, per
FCC rules. Check the regulatory requirements for your region.
6. Interference can also come from out-of-band RF sources such as paging
systems. Installation of a bandpass filter in the antenna system may bring
relief. (Contact the GE MDS Technical Services Department for
recommendations and sources of suitable filters.)
7. Proper use of the
RETRY and REPEAT commands may be helpful in areas
with heavy interference.
The RETRY command sets the maximum number of times (0 to 10) that a
radio will re-transmit upstream data over the air. Values greater than 0
successively improve the chances of a message getting through when
interference is a problem.

The REPEAT command sets a fixed number of unconditional
retransmissions for downstream data.
8. The RF power output of all radios in a system should be set for the lowest
level necessary for reliable communications. This lessens the chance of
causing unnecessary interference to nearby systems.
8.0 RADIO PROGRAMMING
There are no manual adjustments on the radio. Programming and control is
performed through a PC connected to the radio’s
DIAG connector.
NOTE: Access to the transceiver and network-wide diagnostics is dependent on the user-de-
signed and provided interface the to the TransNET OEM module. The following discus-
sion and others in this manual assume a suitable user-provided interface is available.
8.1 Radio Programming Methods
Terminal Interface
A PC may be used by operating it in a basic terminal mode (for example, a
HyperTerminal session) and entering the radio commands listed in the tables
found in “RADIO PROGRAMMING” on Page 33. The PC must be
connected to the radio’s
DIAG port.