DECODE PRM4 Manuale d'uso - Pagina 6

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Point-to-multipoint connection

The below figure illustrates the point-to-point connection. The AM is set to 255 so all

the bits are compared and only the exact match of the SA and DA would lead to

receipt of the packets. The NAs as well as the radio frequencies are set as with the

previous example.

Point-to-point connection

The PRM 4 device receives over the serial interface and buffers the data that needs to

be sent until the condition for sending the data is met. The data is sent when there are

no new data for a specified time interval after the last data has been received on the

serial interface. This time interval can be set by using the AT commands and it is

referred to as the packetization timeout. The default value of this parameter is set to

5ms. In other words, if communicating on 9600bps, a 5 character pause will induce

the modem to send the entire memory content within one packet. The transmit data

buffer size is 512 bytes.

The following figure shows the example of three-character packet generation and

sending on 9600bps with default packetization timeout.

Radio modem PRM4 868MHz /User's manual V1.6 / 24.05.2011