Internet PLC Forum

When i read a timer or counter Present Value like  @01RU0046*  the responce is like @01RUXXXX  plus the checksum and terminator. what does the X's represent. Or  doe's this simply mean "The counter or timer has reached the Set Value" .      Thanks

I am only receiving a responce to the Comands sent out, about every 20 ms at 38400 with a direct serial connection , my code is only sending one command at a time. because it needs to know what command was sent, so it will know where to put the responce data. I get about  8% CPU usage, and that is pretty good so i dont want to mess that up. With this senerio i can only expect to update 50 tags a second. Can anyone Tell me a Better way to do this, or is this as good as I'm going to get. Im using Visual Basic with the MScom control and the
highest baud setting that is common to both the T100MD
and the MScom is 38400. Thanks for any suggestions
 

You know guys, and I will have to go back and read the post, but I think GREGOR just wanted to receive SMS. I wonder if that requires the expensive SMSC number that was mentioned above. Reception only would be far simpler then duplex communciation.

I am not doubting your information, but you did say you checked on this about a year ago. With all of these POCKET PC and PALM OS phones I think there has to be a away to tap into these features without paying homage to MA (C)Bell.

Your Right,
and no you dont have to pay , to receive SMS and yes you can get the received SMS messages from the phone, at least i could with the nokia 3360.  I thought he was wanting to send SMS   Oooop's got ahead of my self.

I checked into sending sms from a PC to a Phone attached to the serial port about a year ago and found out that you have to have a smsc  number to direct the sms's to before they could be sent out to the receiving phone number. Here in the US nework's like Cingular, ATT and so on will not give out thier SMSC number to the public.  You have to be a big company willing to dish out big bucks for it. thats why Siemens Gets 1200 bucks for their GSM modems! The SDK's that come from nokia have alot of examples
in C++ and Visual Basic and they work but you better have a smsc
number if you want to send sms's from your Serial port through a cell phone. There might be third parties with gateways that you can send sms's through I'm not sure though. In one of my Visual Basic Projects i was sending out sms's to cell phones but i had to dialup to the internet and connect to a mail server and send the alert that way as email  eg.. "8001234567@mobil.mycigular.com"
that will get the message to a phone but receiving them is another story.    P.S.  if somone find out you can send sms's please post How

Go to the home page and look for "View Protection" . This feature of the new version of Trilogy might be what you need.

1, Yes only connect one end. I would connect it to the end with the best grounding system. This usually means at the plc or DCS system, not the transmitter.
2, As long as the DC common is connected back to ground somwhere I think it would be ok.
3, The AC ground Should be connected back to ground too, but you need to make sure you have a good ground. If you dont you could get alot of noise if the AC line shorts to ground.
P.S in another post you said you were working on a modbus project, you should go to ebay and search for vHMIAutomation "But dont get the HMI source code, its very complex" take a year to figure out plus there's no comments
but checkout his Modbus Driver . This Driver was reading 62 DM at a wack 3 times a second , this is the link. I have an example on how to use it if you buy the Dll from him.
No development or runtime license keys
No software copy protection
No activation or registration serial numbers
Best of all , you can get it for $19.99
 http://cgi.msn.ebay.com/ws/eBayISAPI.dll?ViewItem&category=11806&item=3807887641&rd=1&ssPageName=WDVW