Low cost serial port I/O boards with A/D, D/A, digital I/Os and local intelligence

The new version 2.0 of TLServer provides a number of File and Email services to the PLCs via the serial comm port. Basically a PLC can send service requests to the TLServer using "tags" (which are ASCII characters enclosed between the '<' and '>' characters) and the TLServer will perform the service requests upon receiving valid commands. The PLC can easily send the tags and ASCII data using the TBASIC PRINT #n command.

Since the PLC is the one which initiates the service request, it does not need to be linked to the TLServer all the time unless it needs to request a service from the TLServer. This makes it possible for a remote PLC to connect to the TLServer via the telephone line using a modem and perform the required file or email services, then disconnects itself from the TLServer so that other PLCs can take turns to connect to the TLServer to request for services.

The following are the currently support file and email services that the TLServer 2.0 provide for the super PLCs

1. Write data to file (the existing file will be overwritten)	Format: <WRITE [filename]> data data data... data.... </>
2. Append data to file (new data are added to the existing file)	Format: <APPEND [filename]> data data data... data.... </>
3. Email data to recipient	Format: <EMAIL [email address]> Sender: [sender email] Subject: [subject text] data data data... data.... </>
4. Read Data from File	Format: <READ [filename]> </>
5. Read Real Time Clock From TLServer	Format: <READ RTC[]></>

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