Command descriptions
9XTend-PKG-R RS-232/485 RF Modem User Guide
45
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 modem 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.
DB (Received Signal Strength) Command
<Diagnostics> DB Command is used to read the receive signal strength (in decibels relative to milliwatts) of the last
received packet. This parameter is useful in determining range characteristics of the RF modems under various
conditions.
In default mode, this command shows the power level in signed decimal format with the units (dBm). If CF = 1, the
magnitude of the value is presented 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 modem has received an RF packet, the modem will return a value of
0x8000 (which means an RF packet has not yet been received).
4
Low
Default Parameter Value: 0
Number of bytes returned: 1
Related Commands: RT (GPI1 Configuration), TO (GP01 Timeout)
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)
AT Command: ATDB
Binary Command: 0x36 (54 decimal)
Parameter Range (read-only): 0x6E - 0x28 (-110 to -40 Decimal)
Number of bytes returned: 2
AT Command: ATCS