PXG 900 User's Guide - Firmware Version 4.3 - 1/9/201721Modbus TCP ServerModbus TCP Server EnabledThe PXG can also function as a Modbus TCP server, providing channel data as Modbus registers from both Modbusand INCOM devices. The device addresses and Modbus maps for these devices can be downloaded directly fromthe PXG.Normally, the PXG provides only channel data supported by its internal device definition: the EDS file. However, thePXG also has a Modbus "pass through" mode, allowing a Modbus client to connect directly with the device and usethe device's native Modbus register set. You can set pass through for COM1, COM2, and Network 2 (Ethernet).Modbus TCP Server SetupServer setup is in Settings, on the Network Access tab. Choose Edit to access the configuration settings. Youenable the server under the Access Control group (Modbus TCP must be enabled to see Modbus TCP ServerConfiguration). You can also change the TCP port. To enhance security, enable Trusted Hosts and then add the IPaddress of each Modbus client using Add Trusted Host/IP Address. Under Modbus TCP Server Configuration, youcan set up the way the server responds to client requests. For example you can allow the server to respond to writecommands, where appropriate, or not to allow them.