CC send time in Xbee Command mode sequence

XBee & XBee Gateway XBee - DigiMesh
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1

Hi,

Please tell me about the Command Character (CC) and Guard Time (GT) of the Xbee AT commands.

I understand that the sequence GT+CC+GT is required to put Xbee into command mode.

The User Guide’s CC explanation reads as follows:
“You must enter it three times within the guard time to enter Command mode.”

By the way, I want to set GT to a minimum of 2ms.
At a baud rate of 9600bps, it takes 3.125ms to send “+++” without parity.
1/9600 = 104.16 us/bit
104.16 * 30bit = 3.124 ms

When GT is set to a minimum of 2ms, it is physically impossible to follow the CC sequence. Is there a mistake in my understanding?
Can you tell me the time limit to send the CC?

2

No there is no mistake. Setting GT to the lowest value at 9600 baud will keep you from being able to enter command mode. You would need to set GT to a value that is possible to send the CC value 3 times.

3

Thank you for your reply.

I understand that I need to set a GT that is sufficient to send CC three times.
If I want to set the GT to 2ms, I will use BD at least 19200bps.
1/19200 = 52.08us/bit
52.08*30bit=1.5625ms