User's Manual

Table Of Contents
CHAPTER 3
Performing Advanced Functions
28
where:
dd mm yyyy is the date
hh mm ss is the time
si is the size of the frame
ft is the frame type (38 for addIT devices)
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 addIT (<Series4) devices always respond with a type 38 data
frame. The composition of the data block of such a frame (the
bytes marked as d1, d2... dn) is depicted in Figure 5, while the
digibyte is depicted in Figure 6.
Figure 5. Frame 38 description
Figure 6. The Digibyte
D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13
RF incoming
RF outgoing
Digibyte
Pulse Counter I/O B
Pulse Counter I/O A
Battery
Cabling 1 I/O B
Cabling 2 I/O B
Cabling 3 I/O B
Cabling 1 I/O A
Cabling 2 I/O A
Cabling 3 I/O A
Reserved
b7 b0
SC Res U U Res Res Dig A Dig B
SC — Battery charge (0–off, 1–on)
Res — Reserved
U — Undefined
Dig A —þDigital I/O A
Dig B — Digital I/O B