CHAPTER 3
Performing Advanced Functions
26
•
si
is the size of the frame
•
ft
is the frame type (39 for the A725)
•
d1 d2 ... dn
are the data values (the frame content)
•
cs
is a 16-bit checksum obtained by summing the bytes and
discarding the carries over
0xFFFF
The A725 devices always responds with a type 39 data frame. The
composition of the data block of such a frame (the values marked
as d1, d2... dn) is depicted in Figure 14, while the digibyte is
depicted in Figure 15.
Figure 14. Frame 39 description
Figure 15. The Digibyte
The remote version is limited to a single frame. An example of such
a command is given below:
9999 DATA 9999 13/12/2006 19:46:00
9999 DATA
13 12 2006 19 46 23 13 39 255 255 3 0 0 89 0 0 0 0
0 0 0 0 0 0 0 0 2258 0
#
RF incoming
RF outgoing
Digibyte
Pulse Counter CNT0, always 0
Pulse Counter CNT1, always 0
I/O A Cabling 2, always 0
I/O A Cabling 3, always 0
I/O B Cabling 1, always 0
I/O B Cabling 2, aways 0
I/O B Cabling 3, always 0
Battery
I/O A Cabling 1, always 0
Checksum
b7
b0
SC
Res
Res
Res
Res
Res
Res
Res
SC — Solar Cell (0–off, 1–on)
