MaxStream 24XStream-PKG-T, Product Manual

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XStream ‐ PKG ‐ T™ Telephone RF Modem – Product Manual v5.x00 [2006.02.24]
When the BD command is sent with a non-standard interface data rate, the UART will adjust to
accommodate the requested interface rate. In most cases, the clock resolution will cause the
stored BD parameter to vary from the parameter that was sent (refer to the table below).
Reading the BD command (send "ATBD" command without an associated parameter value) will
return the value that was actually stored to the BD register.
Parameter Sent vs. Parameter Stored
BD Parameter Sent (HEX) Interface Data Rate (bps) BD Parameter Stored (HEX)
0 1200 0
4 19,200 4
7 115,200 7
12C 300 12B
1C200 115,200 1B207
BK (Serial Break Passing) Command
AT Command: ATBK
Binary Command: 0x2D (45 decimal)
Parameter Range: 0 – 1
Parameter Configuration
0 disable
1 enable
Default Parameter Value: 0
Number of bytes returned: 1
Minimum Firmware Version Required: 4.30
<Serial Interfacing> Pass a serial break condition
on the DI pin to the DO pin of another modem.
BO (Serial Break Timeout) Command
<Serial Interfacing> DO pin will return to default
after no serial break status information is
received during the timeout period.
AT Command: ATBO
Binary Command: 0x2F (47 decimal)
Parameter Range: 0 – 0xFFFF [x 1 second]
Default Parameter Value: 0
Number of bytes returned: 2
Related Commands: BK (Serial Break Passing)
Minimum Firmware Version Required: 4.30
Use with BK = 1.
BT (Guard Time Before) Command
<AT Command Mode Options> BT Command is
used to set/read the DI pin silence time that
must precede the command sequence character
(CC Command) of the AT Command Mode
Sequence.
AT Command: ATBT
Binary Command: 0x04 (4 decimal)
Parameter Range: 2 – 0xFFFF
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The default sequence used to enter 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]
[x 100 milliseconds]
Default Parameter Value: 0x0A (10 decimal)
Number of bytes returned: 2
Related Commands: AT (Guard Time After),
CC (Command Sequence Character)
• No characters sent for 1 second [AT (Guard Time After) Command]
All of the values in this sequence can be adjusted.
Fast AT Command Mode Entry. Set AT and BT parameters to 0 for 0.6 second guard times.
Beware that this will also mean that AT Command Mode cannot be entered by manually typing
the AT command sequence characters (“---” by default) because the BT timeout will occur faster
than the characters can be typed.