TIAMIS-800 wireless radio transceiver
User Manual. Ver. 1.3
DOUM0003AA
Page 12 of 35
•
Each Slave in the network must have their
NetworkID
and their
AddressMask
matching the corresponding Master’s settings.
•
Each Slave in the network must repeat the Master’s hopping pattern,
HopTableLength
,
and the options selected for each of the hopping channels.
The settings ignored by the Slave radio:
•
MasterSlotBytes
and
SlaveSlotBytes
(these settings are used by the Slave only
during the initial network acquiring process). Once the Slave ‘finds’ its Master, it
will use Master’s settings instead.
3.3. Point-to-Multipoint network overview
In general, a Point-to-Multipoint network includes a Point-to-Multipoint Master (P2M
Master), a Slave, and optional Repeater(s). The network allows two way communications
between the P2M Master and the Slaves.
The typical Point-to-Multipoint network assumes that all of the messages sent from the
P2M Master to the Slaves do not required acknowledgement by the Slaves. On the other
hand, the transmissions sent by the Slaves to the P2M Master need to be acknowledged
by the Master. However, if needed, the user can turn the acknowledgement on the Slaves
Off. It gives added flexibility to the user to adjust the network performance to the
application requirements.
All of the packets sent by the P2M Master within Point-to-Multipoint network are always
Global_Packets. The packets sent by the Slaves are always Local_Packets addressed to
the P2M Master. Therefore, the direct communication between the Slaves in the Point-to-
Multipoint network is not supported.
3.3.1. Functionality of the Point-to-Multipoint Master (P2M Master)
A P2M Master radio can send a new packet of data over the RF channel as soon as at
least one byte of the user’s data was received from the user’s data device.
Each RF packet, which the P2M Master sends out, is broadcasted to all listening Slaves
as a Global_Packet.
Each RF packet with or without user’s data in it is sent by the P2M Master once and
repeated
PacketRepeat
times. If the listening Slave receives such packet from the Master
followed by a copy of the same packet, the Slave will discard the additional copies
automatically without delivering a copy of the user’s data to the data port.
