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The Command Data Interface Command Set
The serial message consists of four bytes: Command (read / write / program),
Parameter, Value, and Terminator.
Input message:
Command + Parameter + Value + Terminator (0xFF)
A response is returned after a command is received. If the command is correct,
the response message is an ACKnowledgement (Command = 0x06) with the
Parameter that was received and either the Value that was received for a write
Command or the Value that was queried for a read Command. If the Command
is incorrect, the response message is a Negative ACKnowledgement
(Command = 0x15) with the Parameter that was received and an error code in
the Value byte. Every message must have a Terminator byte (0xFF) that
identifies the end of the message.
Reply Message:
ACK: Command (0x06) + Parameter Received + Value Received + Terminator (0xFF)
NACK: Command (0x15) + Parameter Received + Error Code + Terminator (0xFF)
The Command byte distinguishes between three different actions.
Read – 0x01: When Command is 0x01, the module reads the current
parameter settings. This is useful to poll the module for its current operating
status. The Value byte is not used on a read input message, so is set to 0x00.
This byte will contain the appropriate value on the output message.
Write – 0x02: When Command is 0x02, the module writes the parameter into
temporary memory. Once power is removed from the module, these settings
are lost and the default settings are restored on power up. This allows the
module to be controlled through software while allowing a return to the factory
default state on a power cycle. This is also useful in frequency hopping
algorithms where the channel can be changed quickly without having to wait
the required time for writing to non-volatile memory.
Program – 0x03: When Command is 0x03, the module programs the
parameter into non-volatile memory. These settings are used after the module
has been turned off instead of the factory default settings. They can be used as
a one-time setup through software or as custom default settings when power is
cycled to the module.
The command set uses binary data and not ASCII data.
CMD_DATA_IN
CMD_DATA_OUT
Depends on
command
2.4ms
Depends on
command
READY
Depends on
command
2.3ms
Figure 3: NT Series Transceiver Command Data Interface Timing
– 2 –
NT Series Command Data Interface
Reference Guide RG-00101
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