Figure 4.2.2
4.3
DNT90M Default Network Configuration
The default parameter values in a DNT90M provide “plug-and-play” operation for a point-to-point network. By default,
DM90M radios are configured for transparent serial data communication at 9.6 kbps, 8 bit data, one stop bit, no parity.
Data is routed using the transparent mode destination address held in the
RmtTransDestAddr
parameter. The default val-
ue for this parameter is the broadcast MAC address, 0xFFFFFF. However, the
TransPtToPtMode
parameter is enabled
by default, which causes a radio to unicast packets to the peer from which it most recently received a message. These
two parameter defaults make a network consisting of two DNT90M radios “plug-and-play”, as they automatically select
each other’s MAC addresses for transmitting transparent data back and forth efficiently.
4.4
Customized DNT90M Network Configurations
The DNT90M includes many configuration parameters that allow extensive network customization. Most applications will
require only a few of these parameters be changed from their default values. But for those applications that need them,
Murata recommends the following configuration sequence. Skip the configuration steps where the default parameter value
is satisfactory.
1. For any network configuration other than a point-to-point system, set the
TransPtToPtMode
parameter to 0x00 in
each radio to disable the “reply to last received” feature.
2. For any DNT90M network communicating sensitive data, set the AES security key in all network radios by loading
your selected 16-byte string into the
SecurityKey
parameter in Bank 0 (the default is 16 bytes of 0x00).
3. Configure the system ID in all radios by setting the
SystemID
parameter in Bank 0 (the default is OK if there is no
chance of overlapping systems).
4. Set the transmitter power level as needed in all radios by setting the
TxPower
parameter in Bank 0 (the default is
158 mW).
©2012 by Murata Electronics N.A., Inc.
DNT90M Integration Guide (2012/09/17)
Page 17 of 74
www.murata.com
