Ethernet solution required

Spanner zn

from what I know the A1700 only has serial options, not Ethernet, you need to convert to that, check this link

http://www.elstermetering.co.uk/downloads/A1700COM_english.pdf

the protocol will be IEC 62056-21

Ok, but the attached brochure says ethernet is available.

If not, what would be the best proticol to use RS485 or RS232?

Then what converter would I use to convert this back to profibus DP?

So it does, different to the web site and what I know, must be new.

why not contact them, they may support Profibus

http://www.elstermetering.co.uk/en/contact_us.epl.html

Does the Elster unit support Modbus RTU ? (edit: The brochure mentions "Modbus Converter").
And is it ET200S ?
If that is the case, you can add a serial interface card 1SI to the ET200S rack, and connect this to the Elster unit.
The big problem is how to interpret the protocol IEC 62056-21. I dont think there is a library for that in Siemens.
edit: The brochure just mentions "Ethernet" once. No descriptions. I am guessing it has RS232 and RS485 onboard and you need some kind of converter to get to Ethernet.

The alternative is to use a Siemens SENTRON PAC3200 energy meter for which there are both Profinet and Profibus DP communication modules. I would prefer to go down this path.

From what little I can find it looks like while the device does have an Ethernet port but it’s for a “meter reading” protocol (IEC62056-21). So you need to bridge between IEC62056-12 to Modbus/TCP (or RTU if you want to do serial).