Modem1: The host PC may use any
internal or external modem that can communicate at 2400 bps or faster. Connect
the modem to the PC as instructed in the modem’s manual and connect the phone
line to the phone jack on the back of the modem marked "WALL" or
"Line".
Modem2: The modem to be attached
to the PLC (modem2) must be an external modem with an RS232 connection port.
TLServer 2.0 Modem
Support
The TLServer 2.0, which
is part of the Internet TRiLOGI version 5.1 software suite, includes built-in
support for dialing a modem. Whenever a user wants to communicate with the PLC,
he/she will first use the TLServer to dial and connect to the PLC’s modem.
Once the modem
communication is established, the PLC becomes accessible via the Internet so
long as the PC running the TLServer is connected to the Internet.
You can also easily program the PLC
to automatically dial in to the TLServer in response to an event. This allows
the PLC to perform a number of tasks that require the PC, such as using the File
Service to save or append data to hard disk files, send email to anyone via the
Internet or even synchronize its real time clock with the host PC!
A number of examples have been
included in the "C:\TRiLOGI\TL5\usr\File Services and Modem" folder in TRiLOGI
version 5.1 or greater. All these examples make use of a powerful yet easy to
use custom function that was written entirely using the standard TBASIC
commands.
For more details, please refer to the TRiLOGI Version 5.1 Help Files.