Product manual
9XTend‐PKG‐R™RS‐232/485RFModem–ProductManualv1.2.4
©2005MaxStream,Inc.ConfidentialandProprietary 26
CN (Exit Command Mode) Command
AT Command: ATCN
Binary Command: 0x09 (9 decimal)
<Command Mode Options> CN Command is used
to explicitly exit AT Command Mode.
CS (GP01 Configuration) Command
AT Command: ATCS
Binary Command: 0x1F (31 decimal)
Parameter Range: 0 – 4
Parameter
Value
Configuration
0 RS-232
flow control
1 RS-485 TX enable low
2 high
3 RS-485 TX enable high
4 low
Default Parameter Value: 0
Number of bytes returned: 1
Related Commands: RT (GPI1 Configuration),
TO (GP01 Timeout)
<Serial Interfacing> CS Command is used to
select the behavior of the GP01 pin. This output
can provide RS-232 flow control, control the TX
enable signal (for RS-485 or RS-422 operations),
or set the default level for the I/O line passing
function.
By default, GP01 provides RS-232
(Clear-to-
Send) flow control.
CT (Command Mode Timeout) Command
AT Command: ATCT
Binary Command: 0x06 (6 decimal)
Parameter Range: 2 – 0xFFFF [x 100 ms]
Default Parameter Value: 0xC8 (200d)
Number of bytes returned: 2
Related Command: CN (Exit Command Mode)
<Command Mode Options> CT Command is used
to set the amount of time before AT Command
Mode terminates automatically. After a CT time of
inactivity, the modem exits AT Command Mode
and returns to Idle Mode. AT Command Mode can
also be exited manually by issuing the CN (Exit
AT Command Mode) Command.
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 XTend Modems under various
conditions.
In default mode, this command shows the power
level in signed decimal format, with the units
(dBm). If CF is set to 1, the magnitude of the value is presented in unsigned hex. If CF is set to
2, the value is presented in decimal, but without the units.
AT Command: ATDB
Binary Command: 0x36 (54 decimal)
Parameter Range (read-only):
0x6E – 0x28
(-110 to -40 Decimal)
Number of bytes returned: 2
Related Command: CN (Exit Command Mode)
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 no packets have yet been received).