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3.6 Wide Area Telemetry (WAT)
One of the most exciting features of your modem is its ability is not just to
automatically dial on demand, but also exchange information with another, remote
PLC. We refer to this process as Wide Area Telemetry (WAT) as it gives you the
possibility of setting up a wide area network of PLC's.
AnS, A
MITSUBIS
MITSUBIS
MITSUBIS
MITSUBIS
FX0S/FX1S
FX0N/FX2N
FX
In the previous section (3.5) it was mentioned that placing the values A to D (hex)
into one of the message slots of the command block would enable a WAT transaction.
3.6.1 Setting the Start Address of WAT Information
The information used to perform a WAT operation is stored in a WAT header; any
contiguous block of three D type registers within the PLC may be used. All the
modem needs to know is the first address.
To program the start address in the modem, use a PC terminal to communicate with it
and type an AT command in the following format:
Where n is the letter A to D and corresponds to the hexadecimal value set in the
message register of the control block above.
1234 is an example start address
Example 3-8 Setting WAT addresses
AT%WATA = 500
AT%WATD = 22
Modem-A2S
RD
SD
CD
TR
CS
OH
DATA
RS232
VOICE
LINE
24V
OV
lo
RD
CD
CS
mod
D R
V
LI
1
2 O
AT%WATn = 1234
when hexadecimal A is found in the message register
the modem will read address D500 for instructions.
when hexadecimal D is found in the message register
the modem will read address D22 for instructions.
21
Modem-A2S
RD
SD
CD
TR
CS
OH
DATA
RS232
VOICE
LINE
24V
OV
lo
RD
CD
CS
mod
D R
V
LI
1
2 O
AnS, A
MITSUBIS
MITSUBIS
MITSUBIS
MITSUBIS
FX0S/FX1S
FX0N/FX2N
FX
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