Can I use a 56k modem to access IP address

I have to install a plant of recorders where the recorders are used to record as many curve measurements. These are devices with an internal memory to save data, and an Ethernet port to connect. This recorder has an IP address, and I can access the data stored on a PC networked to the recorder through the IP address. Everything works fine as long as I stay in my office for testing. But the reader must be in a factory located 200 km from my office, and this plant has no network connection, but only one phone line drawn from offices located 500 m from it. So a line that passes through a PBX. So I can not use a network connection from the factory. I must therefore choose another way. Initiate an ADSL line in the plant and plug a modem into the unit or connect a 56k modem on my phone while using the phone line already present. But I could ask my device with its IP address from my PC connected to the Internet if the device is connected to the internet in 56k?

It may eventually result in "can I use a 56k modem to reach an IP address" but it did not make much sense either. In the current state of the question just might say that the type of modem has nothing to do with the network protocols being used. In fact, this question seems to overlap with it . So what I want you to be more specific so that I can be get more information and then will able to give you the proper solution.

If you want to communicate with a machine to retrieve information with a 56K modem, a priori, this poses no problem. The problem may be in the amount of info to retrieve .This kind of connection between two shops by an internal line switchboard is often rocked by another time. When you make a number, you hear the "musical notes" or bursts of "tic tic". If it is the "tick tick", it will find you have to know a modem to dial a number in decimal.

Yes, here you have summed up what I want to make apart from the LAN part of Plant A, but this is detail. Plant B where I am has a PBX with Internet access. Plant A has only line which is connected to a PBX (in office C) located 500 m from the plant. I think there will be a way to draw a line office network to the plant C A if it is necessary, because the office has Internet access. So do you think it is possible to connect my device to the Internet IP address of the factory A via a 56k modem?

I have a small idea that could possibly help you, If the equipment in the A and connect to a computer, so you only have PC anywhere install and configure with Telephone. Go to site B and do the same thing. A PC with PC anywhere and dial the telephone number of the location A including area code. This will allow you to connect to the PC and do what you have to do. Something, it'll be very long like using an old computer Except that it's long distance you'll connect with the PC of A.