User's Manual

To send the string "Hello World" the corresponding

CMD_DATA_REQ

has to be inserted into the

input line of hterm. The "Type" needs to be change from "ASC" to "HEX" before entering the

ﬁrst byte. The command

CMD_DATA_REQ

has the following structure:

Start signal Command Length Payload CS

0x02 0x00 1 Byte Length Bytes 1 Byte

In this example the payload 0x48 0x65 0x6C 0x6C 0x6F 0x20 0x57 0x6F 0x72 0x6C 0x64

0x21 (Hello World!) has a length of 12 (0x0C) Bytes. The checksum CS is a XOR conjunction

of all previous bytes, which is 0x0F in this case.

Using the "ASend" button followed by pushing the "Start" button sends the data once. The

second module receiving this packet outputs a

CMD_DATAEX_IND

message containing the

transmitted payload data and the corresponding RSSI value.

In the default address mode (

MAC_DefaultAddressMode

= 0), the format of the

CMD_DATAEX_IND

is as follows:

Start signal Command Length Payload RSSI CS

0x02 0x81 1 Byte (Length-1) Bytes 1 Byte 1 Byte

Thus, the

CMD_DATAEX_IND

message informs us that we received a packet with payload of

13 (0x0D) Bytes. 12 byte of these Bytes are the transmitted user payload 0x48 0x65 0x6C

0x6C 0x6F 0x20 0x57 0x6F 0x72 0x6C 0x64 0x21 (Hello World!) and one byte is the RSSI

value, here 0xD9 (-39dBm in two’s complement notation).