RS
‐
232/485
RF
Modem
Product
Manual
–
MAN0782
‐
02
Page
23
RF Communication Options
The RS-232/485 RF Modem can be configured to operate in any of three RF communication
modes:
•
Streaming
•
Acknowledged
•
Multi-Transmit
The mode is defined by parameters stored in the transmitting modem [see table below].
Receiving modems automatically adapt to the correct mode on a per-packet basis, based on the
contents of each received packet.
Table
3.3.
Mode
in
Relation
to
Transmitting
Modem
Parameter
Values
RF Communication Mode
RR Parameter Value
MT Parameter Value
Streaming 0 0
Acknowledged >=
1
0
Multi-Transmit ignored
>=1
Addressing Options
Transmissions can be addressed to a specific modem or group of modems using the DT
(Destination Address) and MK (Address Mask) commands. A receiving modem will only accept a
packet if it determines the packet is addressed to it, either as a global or local packet. The
receiving modem makes this determination by inspecting the destination address of the packet
and comparing it to its own address and address mask [Figure 3.10].
Figure
3.10.
Address
Recognition
(@
RX
Modem)
The transmitting modem 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 3.11]. It is assumed that the address masks on the
transmitting modem and receiving modem have been programmed to the same value for proper
operation in each RF Communication Mode.
Figure
3.11.
Address
Recognition
(@
TX
Modem)
