9XTend
‐
NEMA™
RS
‐
232/485
RF
Modem
–
Product
Manual
v2.x4x
[2007.01.04]
©
2007
MaxStream,
Inc.,
Confidential
&
Proprietary
‐
All
Rights
Reserved
40
RB (Packetization Threshold) Command
<Serial Interfacing> The RB command is used to
set/read the character threshold value.
RF transmission begins after data is received in
the DI Buffer and either of the following criteria is
met:
• RB characters received by the UART
• RO character times of silence detected on the
UART receive lines (after receiving at least 1
Byte of data)
If PK (Max. RF Packet Size) is lowered below the
value of RB, RB is automatically lowered to match the PK value. If (RO = 0), RB bytes must be
received before beginning transmission.
Note: RB and RO criteria only apply to the first packet of a multi-packet transmission. If data
remains in the DI Buffer after the first packet, transmissions will continue in a streaming manner
until there is no data left in the DI Buffer (UART receive buffer).
RC (Ambient Power - Single Channel) Command
<Diagnostics> The RC command is used to exam-
ine and report the power level on a given channel.
Sample output: -78 dBm [when CF = 0]
4e
[when CF = 1]
-78 [when CF = 2]
RE (Restore Defaults) Command
<Diagnostics> The RE command is used to
restore all configurable parameters to their fac-
tory default settings.
The RE Command does not cause default values
to be stored to non-volatile (persistent) memory. For the restored default settings to persist in the
modem’s non-volatile memory and be saved in the event of RF modem reset or power-down, the
WR (Write) command must be issued prior to power-down or reset.
RM (Ambient Power - All Channels) Command
<Diagnostics> The RM command is used to
examine and report power levels on all channels.
If no parameter is given, the channels are
scanned one time. If a parameter is given, the
channels are repeatedly scanned for that number
of seconds. The maximum power level seen for
each channel is reported (i.e. peak hold).
A graphical spectrum analyzer can be implemented by repeatedly sending the RM command (with
no arguments) and reading the resultant 50 power levels (this is easiest to do when CF = 1 or 2).
Sample output [when CF = 0]:
Ch 0: -100 dBm
Ch 1: -103 dBm
...
Ch 49: -99 dBm
Sample output [when CF = 1]:
64
67
...
63
Sample output [when CF = 2]:
100
-103
…
-99
AT Command: ATRB
Binary Command: 0x20 (32 decimal)
Parameter Range: 0 - PK parameter value
(up to 0x800 Bytes)
Default Parameter Value: 0x800 Bytes
Number of bytes returned: 2
Related Commands: BR (RF Data Rate), PK (RF
Packet Size), RO (Packetization Timeout)
AT Command: ATRC
Parameter Range (read-only): 0 - 0x31 [dBm]
Number of bytes returned: 1
Related Commands: RM (Ambient Power - All
Channels)
AT Command: ATRE
Binary Command: 0x0E (14 decimal)
AT Command: ATRM
Parameter Range: no parameter - 0x7D0)
Number of bytes returned: 2
Related Commands: RC (Ambient Power -
Single channel)
