ConnextPort x2/x4: is there support for extended modbus register addresses?

Device connected to ConnectPort x4 uses non-standard range of ModBUS holding registers - 56384 through 56896. Java server communicating with the device via ConnectPort x4 is ok with extended addresses. What about x4, does it routes such requests correctly?

Full request path is:
Java server -> TCP network -> ConnectPort x4 (Industrial Automation feature) -> Xbee network -> Xbee-RS485 adapter -> device.