RC11xx(HP)-TM
RC25xx(HP)-TM
RC17xx(HP)-TM
2016 Radiocrafts AS
RC11xx(HP)/25xx(HP)/17xx(HP)-TM Data Sheet rev. 1.48 Page 32 of 86
2016 Tiny Mesh AS
Radiocrafts
Embedded Wireless Solutions
By enabling the
DETECT NETWORK BUSY
parameter, the Gateway Device will either monitor and report
status before building the network, or may optionally refrain from building the network if competing
activity is discovered.
Network ID
The
NETWORK ID
Calibration Memory Parameter is intended for host systems operating multiple mesh
networks, such as the Tinymesh Cloud platform. For stand-alone systems, the
SYSTEM_ID
is sufficient
for identifying devices belonging to a system.
When deploying Internet based host platforms, there may already exist deployed networks with identical
SYSTEM_ID
settings. To be able to uniquely distinguish between co-existing systems with identical
SYSTEM_ID
, the Gateway Device may be configured with a unique, four byte
NETWORK ID
, allocated by
the hosting system.
A host system may request the Gateway
NETWORK ID
by sending a
GET NID
command to
NODE
ADDRESS
0 0 0 0. The Gateway Device will respond with a
STATUS MESSAGE (NID)
event packet,
containing the
NETWORK ID
in the
ADDRESS(ID)
Data
field.
The
NETWORK ID
is stored in the module
CALIBRATION MEMORY,
and will be retained after a
RESET
MEMORY
factory reset command.
The
WRITE CONFIGURATION MEMORY
command must be used to change the value of the
NETWORK
ID.
The module must be set to
CONFIGURATION MODE
, and the
SETTING AND CHANGING THE
NETWORK ID (NID)
procedure should be used to change the NID.
IMA On Connect Function
A Router Device may be set to send a
STATUS MESSAGE (IMA)
report every time it connects to the
mesh network. This function may be useful in networks that are normally inactive, and that are
temporarily formed by introducing a Gateway Device, e.g. for data collection when using a hand held
Gateway.
The host system will receive a
STATUS MESSAGE (IMA)
messages every time a new device connects to
the network, and may successively build a complete list of connected devices by storing the
ORIGIN ID
found in the header of each received packet.
Enable the IMA On Connect feature by changing the
IMA ON CONNECT
configuration setting.
Automatic Status Reporting
Tinymesh™ networks provide efficient mechanisms for automatic, time generated status reporting,
automatic messaging on analogue or digital input status change and automatic data transmission on
serial data (UART) input. Automatic status and event reports should be considered as an alternate and
more efficient system design than traditional status polling. Poll commands from a master will occupy
valuable RF bandwidth, limiting the data throughput and responsiveness in a mesh system. In contrast
to protocols normally employed in wired multi-drop systems, a Tinymesh™ network allows any device to
initiate communication as long as the communication media (the RF channel) is free. The local
intelligence embedded in Tinymesh™ devices automatically handles the access to the shared RF
channel by CSMA (Carrier Sense Multiple Access), eliminating the need for a polling master controller.
Automatic, time generated status messages may be generated by setting the
IMA TIME
parameter in
Configuration Memory. The IMA timer is a single byte timer, with selectable time base. The time base
may be set from 10 to 2550 seconds by changing the value of the
IMA TIME BASE
parameter. The
default setting of 6 provides a one-minute resolution for the IMA timer. Time generated messages may
be used for data logging purposes, and as a means to keep track of the on-line status of devices. If the
Routers or End Devices are set to report status once in a given time interval, a host system may
routinely check that all devices have reported back within the time window, and generate an alert if
status messages are missing.
Analogue and digital inputs may be set to trigger event messages on pre-determined status changes.
Event messages triggered by input status changes will be transmitted immediately, providing a more
responsive approach than what may be achieved in a traditional, polled system.
Please reference the chapters
