M7 GX Technical Manual
49
Raveon Technologies Corp.
Figure 1 Overview of Repeater Operation
In the example shown in Figure 3 above,
RV-M7
A
is will communicate with all
other modems in the system. It can directly communicate with
B, H
, and
F
.
Because of propagation limits, it cannot communicate reliable to
E, D, C,
and
G
.
To solve this problem, some of the RV-M7 modems are configured as repeaters.
The still are able to send and receive data, but they also will repeat data out to the
modems that are out of range of
RV-M7
A
.
H
is configured to repeat all messages to/from
E, D
, and
G
.
B
is configured to
repeat all messages to/from
C
, and
D
is configured to repeat all messages to/from
G
.
Store-and-forward repeating is enabled with the ATXR command.
ATXR 1
enables
repeating.
ATXR 0
disables it.
The
Repeat Source
,
Repeat Source Mask
, and the
Repeat Destination
are
programmed into a Repeater Table in the RV-M7. The ATX command is used to
program the Repeater Table. The Repeater Table may have up to 4 entries.
For example, RV-M7
B
in the above example will have two entries in its Repeater
Table. The command to set the two entries is:
ATX1 1020 FFFF 1000 FFFF
ATX2 1000 FFFF 1000 FFFF
The first command above sets the Repeat Source to 1020 and the Repeat
Destination to 1000, both with a Mask of FFFF. The FFFF mask means all digits of
the source and destination are used to determine if the transmission should be
repeated. All packets from units with MYID 1020 (
C
) sent to 1000 will be repeated
