Thanks Sean. I had a quick look in the manual you sent. I am concerned about the below statement. It indicates it cannot initiate commands (if I’m reading this correctly). I will have to try and get in touch with Zach.
About the Modbus Plus Slave Interface
The Modbus Plus Slave interface acts as a host device. A host device can be read and written to from another Modbus Plus host device or controller. The Slave interface will not initiate any point-to-point communication to other nodes, it will only respond to incoming commands. It can, however, broadcast Global Data to other nodes on the network, and extract Global Data from another node.