Murata WIT2420 - Packet Formats; Data Packet

Murata Electronics Corporation 13 6/2/2021
3.1. Packet Formats
The byte formats for each packet type are shown in the table below. Packet fields are
organized to fall on byte boundaries. In the case of bit-level fields, most-significant bits are
on the left.
WIT2400 packet type (mode 04):
Base DATA 0000 0010 00HH HHHH LLLL LLLL <0-212 bytes data> 0000 0011
Remote DATA 0000 0010 0000 0000 LLLL LLLL <0-212 bytes data> 0000 0011
MRTP (WIT2420) packet types (modes 01-03):
Transmit and Receive:
Base DATA 1110 1001 00HH HHHH LLLL LLLL <0-212 bytes data>
Remote DATA 1110 1001 0000 0000 LLLL LLLL <0-212 bytes data>
Receive only:
CONNECT 1110 1001 10HH HHHH RRRR TTTT 00NN NNNN <3 byte remote ID>
DISCONNECT 1110 1001 11HH HHHH 0111 1111
H : handle number (0-63)
L : data length (0-212)
N : remote's previous network number (if roamed)
R : receive sequence number (from previous cell)
T : transmit sequence number (from previous cell)
Note that while the packet length can be set to 212, the maximum number of bytes transmitted
per hop is limited to the lesser of 212 or the length specified by maximum data length. Packets
with a data length longer than that will be discarded and not sent. See Get Maximum Data
Length for more details.
3.1.1. Data Packet
Modes 01 & 02:
Base 1110 1001 00HH HHHH LLLL LLLL <0-212 bytes data>
Remote 1110 1001 0000 0000 LLLL LLLL <0-212 bytes data>
Mode 04 (WIT2400):
Base 0000 0010 00HH HHHH LLLL LLLL <0-212 bytes data> 0000 0011
Remote 0000 0010 0000 0000 LLLL LLLL <0-212 bytes data> 0000 0011
H : handle number (0-63)
L : data length (0-212)
This packet carries user data. The handle number is the handle of the receiving remote.
When data is being sent from a remote to the base, no handle number is required. Up to 212
bytes of user data may be carried per data packet but no more than is specified by the
maximum data length parameter. The radio will not break up a packet over multiple hops.
Packets with a data length greater than maximum data length will not be sent and will be
discarded. This parameter is variable and depends on the number of remotes currently
registered.