DNT500
2008 by RF Monolithics,
Inc.
23
M-0500-0000 Rev D
4.1.3 CFG select pin
A falling edge on the CFG pin is the equivalent of entering the escape sequence to invoke
the protocol mode. A rising edge on the CFG pin is the equivalent to sending the exit pro-
tocol command.
4.1.4 Flow control
There are two flow control signals between the radio and the host, RTS and CTS. See
Section 2.7.4 for flow control details.
4.1.5 Protocol mode data message example
For Example 4, ASCII text “Hello World” is sent from the base station to a remote using
a TxData command. The MAC address of the remote is 0x000102. The protocol format-
ting for the host message is:
0xFB 0x0F 0x05 0x02 0x01 0x00 0x48 0x65 0x6C 0x6C 0x6F 0x20 0x57 0x6F 0x72 0x6C 0x64
There are 15 bytes following the length byte, so the length byte is set to 0x0F. Note that
the 0x000102 MAC address is entered in Little-Endian byte order 0x02 0x01 0x00.
When an ACK to this message is received from the remote, the base station outputs a
TxDataReply message to its host:
0xFB 0x06 0x15 0x00 0x02 0x01 0x00 0x80
The 0x00 TxStatus byte value indicates the ACK reception from the remote. The RSSI
value is 0x80.
If the remote is in protocol mode, the received message is output in the following format:
0xFB
0x10
0x26 0x02 0x01 0x00 0x8A 0x48 0x65 0x6C 0x6C 0x6F 0x20 0x57 0x6F 0x72 0x6C
0x64
The message is output as an 0x26 event. Note that the RSSI value 0x8A is inserted be-
tween the remote’s MAC address and the “Hello World” user data.
4.2 Configuration Registers
The configuration registers supported by the DNT500 are described below. Registers are
sorted into banks according to similarity of function.