title: connecting to TCP/IP modbus slave with an IP address
body: <p>I have a TCP/IP Modbus slave running on my desktop. I can happily connect a TCP/IP Modbus master to it through 127.0.0.1, port 502 on the same desktop.</p>
  
  <p>But I want to connect to the slave by a master on another machine on the network.
  The IP address of my machine is 192.168.3.58.</p>
  
  <p>Whether the master is on my desktop or on another machine, I cannot connect to the slave using an IP address of 192.168.3.58, port 502.
  I can ping 192.168.3.58 from my desktop (as I would hope!) and from other machines on the network.</p>
  
  <p>Please suggest what my mistake is!
  Thanks</p>