Is there a device that converts generic modbus addressing to modicon modbus 5-digit or 6-digit addressing? We are converting a serial to a TCP/IP and the master device only has drivers for 5-digit / 6-digit addressing. We've already tried a variety of offsets and it doesn't seem to work. The gateway is just a pass-thru device. The slave device is a Elektronikon Mark IV with Serial Modbus. Oh, and AB Ethernet/IP is not an option either.