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Topics - mullacott

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Technical support / CRC problems
« on: December 17, 2011, 03:12:03 PM »
 I am writing on a nano a communications package that will talk to a Heatmister RS485 room stat. I have the communications working fine except I am having trouble with the CRC CCITT (0xFFF) checksum. I have to use an online calculator to find the CRC and enter it by hand. What I need is to be able to calculate in the code the CRC. The built in CRC16 in TBASIC give the wrong answer. Has someone done this and can help.  Example of data frame is ? 03 0A 81 00 00 00 FF FF? and then I add a CRC of ?8A 86? low byte then high byte.

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Technical support / Nano 10 Email
« on: November 28, 2011, 01:25:08 PM »
I am having a problem getting a Nano 10 to send out an email. I have a Nano 10 connected to a few MODBUS power sensors and a Weintek touch screen over MODBUS. The PLC is connected to a router and there is no pc on the system so I canot use TLserver. I have used the worked example ?
 SEND AUTHENTICATED EMAILS DIRECTLY FROM THE PLC USING TCPCONNECT?. I get a fail message back. I think the problem is my isp is blocking emails coming in on their port 25 and 587. I have tried telnet ?username? and the reply says can not open host on port 25. Is there anyone who has got this to work with their isp and if so who are they using. Or is there a clever work around.

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