User manual

Page 86 915U-2 Wireless I/O
Page 86 User Manual
The Table below shows an excerpt from the above screen shot.
Data frames are displayed similar to the WibMesh Monitor Radio Comms except the
data is a different format..
Below that is another table explaining each of the field within the data frame.
Corrupted data frames are shown with an “ERROR!” in the frame.
Time
TX/RX
Frequency
Signal
Level
Data
Length
Data
0:06:12.465
Tx :
919.125
[ 1355]
( 11)
3A 03 81 02 00 86 00 01 00 01 ...
0:06:12.545
Rx :
921.125
-56dBm
( 5 )
3A 03 81 82 00
Time
Time stamp indicating the time from when the module was turned on.
TX/RX
Indicates whether the message is received or transmitted
Frequency
Shows the Frequency of the RX/TX frame
Signal
Level
Shows the Receive Signal Level on any received message or internal
sequence number for the transmitted message.
Data
Length
Total length of the transmitted or received message
Data
The TX Data frame from above is dissected below
First two bytes (3A 03 ) = System Address
Next 1 to 5 bytes (dynamic) = Unit Address and any repeater addresses. As
the message gets passed to the next address the address gets 128dec
(80hex) added to it which shows the message has passed through the
repeater or been received and acknowledged. You can see in the above
table the fourth byte of the transmitted message shows 02 which changes
to 82 on the received message and indicates the acknowledgment back
from the receiving module.
fifth byte (00) = Zero Byte spacer
sixth byte (86) = Frame Flag – Type of message
The rest shows the message count and values.
For a full breakdown of the protocol contact Elpro Technologies.