Node-Red Modbus Client

I need to simulate am RS485 Energymeter with node red. I've got an Inverter, which is originaly connected by Modbus to a Acrel Acr10r Energymeter. I can't use this, but want to simulate the Acr10r with Node Red. I'm reading the equivalent energyvalues from an Finder Energymeter into node Red. All variables, which are collected by the Inverter are available in node Red. But now I need an Node Red Modbus Client which answers to the requests of the Inverter. The Inverter does two calls, one time it wants to know register 243-280 (containing 26 numbers) and the second call wants to know register 356-368, containing two numbers.
The job here is to create the Modbus slave flow in node red.