B&B Electronics ZXT9-MB2A-KIT - Manual - Manual (Page 64)

Document Number: ZXTxRM-5110m
Page
64
6.3.6.1 Modem Configuration Switch
The Configuration Switch provides an alternate method for entering into
Command Mode.
To enter Command Mode at the default RF data rate of the modem,
remove power, hold the Configuration Switch (PB1) down and power up
the modem, then release the Configuration Switch.
The Serial port default is 115200, 8, N, 1.
6.3.6.2 AT Command Mode
6.3.6.3 Entering AT Command Mode
Send the 3-character command sequence "+++" and observe guard
times before and after the command characters.
Default AT Command Mode Sequence (for transition to Command
Mode):
• No characters sent for one second [refer to the BT (Guard Time
Before) Command]
• Input three plus characters (“+++”) within one second [refer to the
CC (Command Sequence Character) Command ].
• No characters sent for one second [refer to the AT (Guard Time
After) Command]
All of the parameter values in the sequence can be modified to reflect
user preferences.
6.3.6.4 Sending AT Commands
Send AT commands and parameters using the syntax shown below.
To read a parameter value stored in the RF modem’s register, omit the
parameter field.
The preceding example would change the RF modem Destination
Address (low) to “0x1F.” To store the new value to non-volatile (long
term) memory, subsequently send the ATWR (Write) command before
powering off the modem.
System Response.
When a command is sent to the modem, the
modem will parse and execute the command. Upon successful
execution of a command, the modem returns an OK message. If the
execution of a command results in an error, the modem returns an
“Error” message.
6.3.6.5 Exit AT Command Mode
If no valid AT Commands are received within the time specified by the
CT (Command Mode Timeout) Command, the RF modem automatically
returns to Idle Mode.