If you are multi-dropping off a single modem, use
your I/O Devices to issue the caller ID, not the modem. This is
because using the modem to issue the ID will send the same ID no
matter which I/O Device the call is relevant to. This makes it
difficult to identify the I/O Device that triggered the call.
By using the I/O Device to issue the ID, the I/O
Server will receive a unique caller ID for each I/O Device.
However, not every I/O Device is capable of issuing caller IDs. If
multi-dropping, use I/O Devices that can issue caller IDs.
To configure dial-up remote I/O Devices
for communication with CitectSCADA:
Run the Express Communications
Complete the wizard, selecting
the relevant I/O Server, then the I/O Device, creating each new
instance when necessary.
On the Scheduling page of the
wizard, select the Connect I/O Device to PSTN
Select an appropriate schedule
for CitectSCADA to
communicate with the remote I/O Device. (For a persistent
connection - whenever CitectSCADA is running - select
On Startup.) For example (all based on a
Synchronize at time of 10:00:00):
If you enter 12:00:00 in the Repeat every
field, and start your project at 9 a.m., the I/O Server will
communicate with the I/O Device at 10 a.m., then once every 12
hours after that; that is, 10 p.m., then again at 10 a.m. of the
following day, and so on.
If you enter 12:00:00 and start
your project at 4 p.m., the I/O Server will communicate with the
I/O Server at 10 p.m., then again at 10 a.m., of the following day,
and so on. CitectSCADA will
assume that communications were established at 10.a.m., so will
continue as if they had been, communicating once every 12 hours
after 10 a.m.
If you enter 3 days and start
your project at 9 a.m. on a Wednesday, the I/O Server will
communicate with the I/O Device at 10 a.m., then once every 3 days
after that; that is, 10 a.m. on the following Saturday, then at 10
a.m. on the following Tuesday, and so on.
If you enter the 6th
of December in the Repeat every field and
start your project during November, the I/O Server will communicate
with the I/O Device at 10 a.m. on December 6, then again on
December 6 of the following year, and so on.
Startup for a persistent connection. To disconnect a persistent
connection, call the IODeviceControl() function with type 8.
Type in the phone number
necessary for CitectSCADA
to dial the remote modem attached to the remote I/O Device. Include
any pre-dial numbers necessary to obtain a connection to an outside
PSTN line (dial tone) before dialing (for example, 0 (zero)) - if appropriate.
On the next wizard page, if the
device is configured to dial-in to CitectSCADA, create a unique
identifying caller name for the remote I/O Device so that it can be
identified by CitectSCADA.
Follow the instructions on the
next page of the wizard and click Finish.