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Hi, I have DAQ Factory starter licence..I future if business will grow plan is to have pro licence with unlimited number of tags... Idea is to have a lot of nuber independed networks that will connect to DAQ Factory via ADSL or GPRS/UMTS network using modbus TCP/RTU protocol. Later when DAQ Factory brings real sensor values to screen, values will be uploaded to web server for each customer... I have several types of configuration that I want to install... These are.... 1) sensors...RTU 485 DAQ device .... low cost PLC ( like Siemens LOGO ) ... HMI .... internet .... DAQ Factory ... web server 2) sensors ... GPRS RTU device like http://en.four-faith.com/2164-gprs-rtu.html .... DAQ Factory 3) sensors ... Modbus TCP slave DAQ device ... HMI .... DAQ Factory ... web Generally, if I understand all of that, there is only 1 master device, here is DAQ Factory master device, others must be slave...Is possible to make option 1,2,3 with low cost HMI ??? People wants to see sensor readings localy, later is nice to see it via Internet on smart phone or tablet... Do I need to use only Modbus TCP for all this ( multiple master in network ?? ) THX a lot...Damir

Can someone please help me? I've set up my modbus devices and they are just either connecting or disconnecting. I checked port 502 and find out that it's not open, so assuming that it's because of that. So I tried opening port 502, allowing it on the firewall both inbound and outbound rules, but when i check for the listening port it still not there. I also tried to port forward it on the router but still doesn't work. It's frustrating :| Is there any other way I can open this port? Please help! Thank you so much!