User Manual

12 CompactRFTM Operating Manual: Chapter 3 Configuration Options
M
S
Network 1
M
SR
M
SR
Network 2
M
S
S
S
Network 3
M
R
S
S
S
Network 4
M R
SR
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Network 5
Figure 2 - Sample Network
Topologies. Virtually any
Combination of Slaves and
Repeaters May be Used.
n Master Point-to-Point: The modem is configured to
communicate with a single Slave, either directly, or through one
or more Repeaters.
n Master Point-to-Multipoint: The modem is configured to
communicate with one or more Slaves and/or Repeaters.
n Slave: The modem is configured to communicate with one
Master either directly or through one or more Repeaters..
n Repeater: The modem is configured to pass information from
either a Master or another Repeater onto subsequent Repeaters
and/or Slaves and vice versa. The Repeater also acts as a Slave
in the sense that, like a Slave, it passes information to/from its
serial port.
Examples of different network topologies are shown in Figure 4. Network 1
shows Point-to-Point communication between a Master and Slave. Network
2 makes use of a Repeater to communicate with the Slave. Network 3
illustrates a simple Point-to-Multipoint network with no Repeaters. Networks
4 and 5 gives examples of Point-to-Multipoint networks consisting of both
Repeaters and Slaves. There is effectively no restriction to the number of
Repeaters and Slaves that can be added to a network. As seen in Network 4,
a Master can communicate directly with both Slaves and Repeaters.
3.2 Command Mode
The MHX-2400 firmware has been designed to allow the user to customize
the operation of the modem through an AT Command Interface. This
interface is ideal for direct interface with another microcontroller or for
higher level Windows-based software applications, but also contains user-
friendly built-in register descriptions. These descriptions make it easy for the
user to configure the unit by manually inputting AT Commands and
modifying S-Register parameters, using any standard terminal program. The
MHX-series development board is a useful tool for familiarizing yourself
with the various operating parameters and user interface. Reference
schematics for the development board can be found in Appendix G. To
access the MHX-2400’s command mode using the development board:
1. Insert the module into the socket with the antenna connector towards the
edge of the board.
2. Attach the supplied antenna.
3. Connect a straight through serial cable between the DB9 connector and
the serial port on your PC
4. Run any terminal application program such as Hyperterminal
5. Set the serial port to 9600 baud, 8N1
6. Apply power to the development board
7. While the three RSSI LED’s are blinking, type ‘MHX’ (you have about
5 seconds to do this). The modem should respond with ‘OK’.
8. Type ‘AT&V <ENTER>’