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9XTend? ? OEM ? RF ? Module ?‐? Product ? Manual ? v2.x4x ? [2007.01.04]
CN (Exit AT Command Mode) Command
<Command Mode Options> The CN command is
used to explicitly exit the module from AT Com-
mand Mode.
CS (GPO1 Configuration) Command
<Serial Interfacing> CS Command is used to
select the behavior of the GP01 pin (pin 9). This
output can provide RS-232 flow control, control
the TX enable signal (for RS-485 or RS-422 oper-
Chapter ? 3 ?‐? RF ? Module ? Configuration
AT Command: ATCN
Binary Command: 0x09 (9 decimal)
AT Command: ATCS
Binary Command: 0x1F (31 decimal)
Parameter Range: 0 - 4
ations).
By default, GP01 provides RS-232 CTS (Clear-to-
Send) flow control.
Parameter
0
1
2
3
4
Configuration
RS-232 CTS flow control
RS-485 TX enable low
High
RS-485 TX enable high
Low
Default Parameter Value: 0
Number of bytes returned: 1
Related Commands: RT (GPI1 Configuration),
TO (GP01 Timeout)
CT (Command Mode Timeout) Command
<Command Mode Options> The CT command is
used to set and read the amount of inactive time
that elapses before the module automatically
exits from AT Command Mode and returns to Idle
Mode.
Use the CN (Exit AT Command Mode) command
to exit AT Command Mode manually.
AT Command: ATCT
Binary Command: 0x06 (6 decimal)
Parameter Range: 2 - 0xFFFF
[x 100 milliseconds]
Default Parameter Value: 0xC8 (200d)
Number of bytes returned: 2
Related Command: CN (Exit AT Command
Mode)
DB (Received Signal Strength) Command
<Diagnostics> DB Command is used to read the
receive signal strength (in decibels relative to mil-
liWatts) of the last received packet. This parame-
ter is useful in determining range characteristics
of the RF modules under various conditions.
In default mode, this command shows the power
AT Command: ATDB
Binary Command: 0x36 (54 decimal)
Parameter Range (read-only): 0x6E - 0x28
(-110 to -40 Decimal)
Number of bytes returned: 2
level in signed decimal format with the units (dBm). If CF = 1, the magnitude of the value is pre-
sented in unsigned hex. If CF = 2, the value is presented in decimal, but without the units.
Sample Output: -88 dBm (when ATCF = 0)
58 (when ATCF = 1)
-88 (when ATCF = 2)
NOTE: If the DB register is read before the module has received an RF packet, the module will
return a value of 0x8000 (which means an RF packet has not yet been received).
? ? 2007 ? MaxStream, ? Inc.
????? 25
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