Adcon A720 User Manual
Page 37
CHAPTER 4
Using terminal commands
37
D
ESCRIPTION
Returns data stored for a certain device.
P
ARAMETER
The ID of the device for which the data is requested and the date/
time (in the standard format) the data was stored. If missing, then it
refers to the data of the local device.
R
ETURNS
A data block.
R
EMARKS
GET only. If you don’t include the date/time parameter, the latest
data is returned. If you include the date/time parameter, the date
and time closest to, but later than, the given date/time is returned.
REMOTE
Yes, for a GET on the A720B and A723, but only one frame at a
time. If you are using a terminal window for the A720, you cannot
issue the
DATA command remotely. If you are using a terminal win-
dow for the A720B, you can issue a
DATA command for an A720 or
A723 RTU, but you cannot issue the command for the A720B
receiver. In other words, the base station can issue a remote com-
mand for an RTU, but it cannot issue such a command for itself.
The A720 RTU can issue the command only for itself, and only
locally, while the A723 RTU can also issue remote data commands.
E
XAMPLE
DATA 5666 12/12/1998 12:12:12
193 DATA b1 b2 b3 ... bn 0
#
The data block returned will typically contain a number of data
frames (telegrams). The structure of a block is as follows:
dd mm yyyy hh mm ss si ft d1 d2 ... dn dd mm yyyy
... dn cs
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 A720 devices respond with a type 38 data frame, while the
A723 may respond with type 38 or type 39, depending on the
CM