Product manual
9XTend‐PKG‐R™RS‐232/485RFModem–ProductManualv1.2.4
©2005MaxStream,Inc.ConfidentialandProprietary 24
4.4. Command Descriptions
Commands in this section are listed alphabetically. Command categories are designated between
the “< >” symbols that follow each command title. By default, XTend RF Modems expect
numerical values in hexadecimal since the default value of the CF (Number Base) Parameter is
‘1’. Hexadecimal values are designated by the “0x” prefix and decimal values by the “d” suffix.
%V (Board Voltage) Command
AT Command: AT%V
Binary Command: 0x3B (59 decimal)
Parameter Range (read-only):
0x2CCCA – 0x5BFFA
(2.80 – 5.75 decimal)
Number of bytes returned: 4
<Diagnostics> %V Command is used to read the
current voltage of the XTend Module circuit board.
Sample Output: 5.02 V (when ATCF = 0)
5051F (when ATCF = 1) *
5.02 (when ATCF = 2)
* When CF = 1 (default), a hex integer is shown
that is equal to (voltage * 65536d).
AM (Auto-set MY) Command
<Networking & Security> AM Command is used to
automatically set the MY (Source Address)
parameter from the factory-set modem serial
number. The address is formed with bits 29, 28 and 13-0 of the serial number (in that order).
The value is displayed as a result of this command.
AT Command: ATAM
Binary Command: 0x40 (64 decimal)
AT (Guard Time After) Command
AT Command: ATAT
Binary Command: 0x05 (5 decimal)
Parameter Range: 2 – (ATST-3), up to 0x7FFC
[x 100 milliseconds]
Default Parameter Value: 0x0A (10 decimal)
Number of bytes returned: 2
Related Commands: BT (Guard Time Before),
CC (Command Sequence Character)
<Command Mode Options> AT Command is used
to set/read the time-of-silence that follows the
command sequence character (CC Command). By
default, 1 second must elapse before and after
the command sequence character.
The default sequence used to enter the RF modem
into AT Command Mode is as follows:
• No characters sent for 1 second [BT (Guard
Time Before) Command]
• Send three plus characters “+++” [CC (Command Sequence Character) Command]
• No characters sent for 1 second [AT (Guard Time After) Command]
BD (Baud Rate) Command
AT Command: ATBD
Binary Command: 0x15 (21 decimal)
Parameter Range: 0 – 8
Parameter
Value
BAUD (bps)
Configuration
0 1200
1 2400
2 4800
3 9600
4 19200
5 38400
6 57600
7 115200
8 230400
Default Parameter Value: 3
Number of bytes returned: 1
<Serial Interfacing> BD Command is used to
set/read the interface data rate (the rate at which
serial data is sent to the modem from a host).
Newly modified serial data rates do not take effect
until the modem exits Command Mode [refer to
CN (Exit Command Mode) and CT (Command
Mode Timeout) Commands].
The BR (RF Data Rate) Parameter is not affected
by the BD Command.
Note: If the serial data rate is set to exceed the
fixed RF data rate of the XTend Modem,
flow
control may need to be implemented. Refer to the
Flow Control [p13] and CS (GPO1 Configuration)
Command [26] sections for more information.