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©2009 by RF Monolithics, Inc.
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DNT2400 - 08/18/09
RSSI = 2’s complement value in dBm, with a range of -128 (0x80) to +125 (0x7D) dBm (1 byte);
large positive RSSI values will not occur under ordinary circumstances. RSSI values 126 (0x7E)
and 127 (0x7F) have special meaning:
0x7F = No RSSI measured because no ACK was received
0x7E = reserved for future use
NwkID = Network identifier of network joined (1 byte).
BaseMacAddr = MAC address of base that the remote joined (3 bytes).
AnnStatus = Status announcement (1 byte). Additional fields are also reported
depending on the status code:
Status
code
Additional fields
A0 = Radio has completed startup initialization
none
A2 = Base: a remote has joined the network
Addr, reserved, Range
A3 = Remote: joined a network, ready for data
NwkID, BaseMacAddr, Range
A4 = Remote: exited network (base is out of range)
NwkID
A7
=
Base:
remote
has
left
the
network.
Addr
Status codes for error conditions
Additional fields
E0 = Protocol error - invalid message type
none
E1
=
Protocol
error
-
invalid
argument none
E2
=
Protocol
error
-
general
error
none
E3
=
Protocol
error
-
parser
timeout
none
E4 = Protocol error - register is read-only
none
E8
=
UART
receive
buffer
overflow
none
E9
=
UART
receive
overrun
none
EA
=
UART
framing
error none
Range = Range measurement of joining radio (1 byte). Each count equals 0.29 miles.
BootSelect = Code indicating whether to do a normal reset or a reset to the bootloader (1 byte)
(0 = normal reset, 1 = reset to bootloader)
PermitStatus = Permission for new node to join, 0x00 = denied, 0x01 = permitted (1 byte)
BackoffTime = Time that a node will avoid trying to join a network, in seconds (2 bytes)
(0xFFFF = back off until reset or power cycled)
4.1.3 /CFG Select Pin
A falling edge on the /CFG pin is the equivalent of the EnterProtocolMode command. A rising edge on the
/CFG pin is the equivalent to sending the ExitProtocolMode command. The input to the /CFG pin is de-
bounced to make it compatible with a mechanical switch or jumper.
4.1.4 Flow Control
There are two flow control signals between the radio and the host, /HOST_RTS and /HOST_CTS. See
Section 2.11 for flow control details.
