Specifications

MaxStream Commands 5
4.2.1 Entering AT Command Mode
Commands and data are both sent to the same serial UART on the MaxStream modem. A special break sequence
must be sent to get the modem into AT command mode. After the sequence all subsequent characters are interpreted
as commands and are sent as data.
The default sequence for command mode is:
1. No characters sent for one second (before command character time, change with ATBT).
2. Send three plus characters “+++” (command entry character, change with ATCC).
3. No characters sent for one second (after command character time, change with ATAT).
4. The XStream modem responds by sending an OK<CR>.
The before command character time, after character time and command entry character can all be changed by AT or
binary commands.
4.2.2 AT Command Response
After a recognized and executed AT command the modem responds with an OK<CR>. After unrecognized
commands with bad parameters an ERROR<CR> is sent.
4.2.3 Reading Parameters from Radio
If an AT command is sent without any parameters (carriage return <CR> is still sent), the response is the current
value of that command reported as a hexadecimal number. Example: ATSM<CR> returns the current power down
mode setting.
4.2.4 Exiting AT Command Mode
There are two ways to exit the AT command mode and return to data mode. If no valid AT commands are received
within the AT command time-out (ATCT) time, the modem returns to data mode automatically. Alternatively, the
AT command mode can also be exited by sending the ATCN command.
AT
Command
Binary
Command #
Description Parameters
# Bytes
Returned
For Binary
Factory
Default
DT 0 V4.08 Set the Radio ADress (RAD). Only radios
with the same address can communicate.
Address from 0-65535 2 0
SM 1 Set power down mode 0 - No sleep mode
1 - Sleep on pin
2 - Wake from serial RX
3 - Cyclic 0.5 second sleep
4 - Cyclic 1.0 second sleep
5 - Cyclic 2.0 second sleep
6 - Cyclic 4.0 second sleep
7 - Cyclic 8.0 second sleep
10
ST 2 Set time to sleep. Time of inactivity before
entering power down mode (this number is
only valid in RX and cyclic modes).
Number of tenths of seconds. Valid from
1 to 65535.
264
HT 3 Set time before long header. Time of
inactivity on RX pin before a long header is
used.
Number of tenths of seconds. Valid from
0 to 65535. 65535 means no long
header.
2 FFFF
BT 4 Set silence time after command sequence. Number of tenths of seconds.
Valid from 1 to 65535
2A
AT 5 Set silence time after command sequence. Number of tenths of seconds.
Valid from 1 to 65535
2A
CT 6 Set time out from AT command mode.
Causes a return from AT mode after no
valid commands have been received.
Number of tenths of seconds.
Valid from 1 to 65535
2C8
FL 7 Set serial software flow control. Hardware
flow control (CTS) is always on.
0 - No software flow control
1 - Use software flow control
10
Table 4-1. MaxStream Command Table