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improve the efficiency for data transmission and provide maximum flexibility for user
applications. The internal modem options consist of MCU, Modem IC, and extra
circuitry. These option-boards directly communicate with DTE to send and receive
meaningful data through the DB15 female connector. These modems are designed
to accept RS232, RSTTL or RS485 serial data format and are also capable of high
speed wireless data-transmission between two or more devices.
AT Command of Modem
(Only for GMSK or 4FSK)
Mode
Command
Return
Remark
Querying radio channel
AT+CHN=?\r
\r\nCHN=N\r\n
The range of N is from 1 to 16,
means channel number.
Setting channel
AT+CHN=N\r
\r\nOK\r\n or \r\nERROR\r\n
Querying baud rate
AT+WORKMODE=?\r
\r\nWORKMODE=N\r\n
N is M9600 or M19200,
M9600 means 9600bps…
Setting baud rate
AT+WORKMODE=N\r
\r\nOK\r\n or \r\nERROR\r\n
\r stand for carriage return (ASCII is 0XOD)
\n stand for line feed(ASCII is 0X0A)
Only 4FSK modem can be set to 19200bps.
Dimensions
Summary of Contents for SD-274
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