OpenPeripherals and ExtraUtilities

I'm trying to create a villager farm to farm mystcraft pages. I have a code, but can't get the computer to detect the trading post as a peripheral. I can't seem to find any information about this problem either. I am using the FTB Infinity pack.

Whether a given block works as a peripheral tends to depend on which versions of the mods in concern you're using. Support for given blocks tends to come and go as MineCraft versions increment and Forge has to be rebuilt to catch up (… along with all the mods in concern, and then finally, OpenPeripheral itself).

Unfortunately, OpenPeripheral's documentation is lackluster at best. Typically the only way to determine if a given version will work the way you want is to install it and find out for yourself.