5. For a peer-to-peer network (more than 2 radios), set the
ProtocolMode
parameter in Bank 4 of each radio to 0x01.
Each radio’s host application will require a database containing the MAC addresses of the other radios in the net-
work, as discussed in Section 2.1 above.
6.
For a point-to-multipoint network, set the
ProtocolMode
parameter in Bank 4 of the DNT90M acting as the net-
work
base
to 0x01. The base radio will use protocol-formatted messages containing MAC addresses to communi-
cate with the other radios in the network. Radios other than the base can set the
RmtTransDestAddr
parameter to
the MAC address of the base unit and use transparent mode for sending serial data provided they only communi-
cate with the base. If radios other than the base are sending I/O data, they must be in protocol mode and include
the base MAC address in their protocol formatted messages. If SPI slave mode will be used, protocol mode must
be enabled in all network radios.
7. If using transparent serial mode in the network:
a. Set the timeout for transmission of transparent data as needed. The parameter that controls the timeout is
the
TxTimeout
in Bank 4 (the default is to send as soon as possible).
b. Set the minimum message length for transmission of transparent data in the remotes as needed. The pa-
rameter that controls the length is the
MinPacketLength
in Bank 4 (the default is one byte).
8. Load an optional “friendly description” in each system radio in the
UserTag
parameter, Bank 0.
5.0 DNT90M Application Interface Configuration
DNT90M modules include a comprehensive set of application interfaces and related options that support a wide range of
applications including wireless RS232/485 cable replacements, wireless sensor networks, wireless alarm systems and
industrial remote control applications. Recommended configuration steps for each application interface are discussed in
Sections 5.1 through 5.6 below.
5.1
Configuring the Serial Port
The default serial port configuration is 9.6 kbps, 8-bit data, no parity and 1 stop bit.
1. Configure the serial data rate as required from 1.2 to 250 kbps by setting the
SerialRate
parameter in Bank 3.
2. Configure the parity and number of stop bits by setting the
SerialParams
parameter in Bank 3.
3. Enable/disable serial port hardware flow control as required by setting the
GpioAlt
parameter in Bank 6. Hardware
flow control is disabled by default, but is recommended when operating at higher baud rates and/or sending large
blocks of data.
5.2
Configuring the SPI Port
1. Enable either SPI
master mode
or SPI
slave mode
by setting the
SpiMode
parameter in Bank 3.
The serial port remains operational in SPI master mode but is disabled in SPI slave mode.
2. If using SPI master mode:
a. Select the SPI clock rate by setting the
SpiRateSel
parameter in Bank 3 (default
is 125 kbps)
©2012 by Murata Electronics N.A., Inc.
DNT90M Integration Guide (2012/09/17)
Page 18 of 74
www.murata.com
