9XTend™
OEM
RF
Module
–
Product
Manual
v1.2.4
©
2005
MaxStream,
Inc.
Confidential
&
Proprietary
37
4.
RF
Communication
Modes
The XTend OEM RF Module can be configured to operate in any of three RF communication
modes: Streaming, Acknowledged and Multi-Transmit. The mode is defined by parameters stored
in the transmitting module [see table below]. Receiving modules automatically adapt to the
correct mode on a per-packet basis, based on the contents of each received packet.
Table
4.1.
Mode
in
Relation
to
Transmitting
Module
Parameter
Values
RF Communication Mode
RR Parameter Value
MT Parameter Value
Streaming 0 0
Acknowledged >=
1
0
Multi-transmit Ignored >=
1
4.1.
Addressing Options
Transmissions can be addressed to a specific module or group of modules using the DT
(Destination Address) and MK (Address Mask) commands. A receiving module will only accept a
packet if it determines the packet is addressed to it, either as a global or local packet. The
receiving module makes this determination by inspecting the destination address of the packet
and comparing it to its own address and address mask [Figure 4.1]
Figure
4.1.
Address
Recognition
(@
the
Receiving
Module)
The transmitting module determines whether the packet is intended for a specific node (local
address) or multiple nodes (global address) by comparing the packet’s destination address (DT)
and its own address mask (MK) [Figure 4.2]. It is assumed that the address masks on the
transmitting module and receiving module have been programmed to the same value for proper
operation in each RF Communication Mode.
Figure
4.2.
Address
Recognition
(@
the
Transmitting
Module)
