To setup serial ports in a ZumLink Network there are 4 basic options for doing this.

1. Terminal Server Relay:
   
   • A COM-to-COM communications link.
   • Limited to 20 radios.
     • All Endpoints will receive the exact same data from the Gateway radio
   • Set this up in the COM port pages on both the Gateway and Endpoint Zum Devices.
     
     • MUST use the default TCP ports or else it won’t work.
       • The default is 5041 for COM#1 and 5042 for COM#2
     • Set the BAUD and Parity as need for device connected to it. 
       • These setting do not need to be the same across the radios.
     • Set COM Handler as Terminal Server for both the Gateway and Endpoint COM ports.
       
   • Then setup Terminal Server Relay tab on the Endpoint devices ONLY.  Do NOT setup on the Gateway device:
     • Select how you want to mirror/link the COM ports between the Endpoint and Gateway from the Drop down menu.
     • Enter the IP address of the Gateway/Master radio.
   • Plug in a Serial cable to the COM port configured on the Gateway.
   • Plug in a serial cable to the COM port configured on the Endpoint.
   • Send Serial data to/from either system.
     
     
2. Sending Modbus TCP traffic:
   • Setup the COM port on the EndPoint device.
     • Set the Handler to Modbus Passthru
     • Set the BAUD and Parity as needed for device connected to it.
   • Configure the Modbus TCP port in the Modbus tab.
     • Default TCP port is 502.
     • If the TCP port is changed, then you must reboot for the change to take affect.
   • To connect to the Modbus Device:
     • From a host connected to the Gateway device via Ethernet cable.
       • Open a TCP Socket connection to IP address of the Endpoint Radio on TCP port 502 or whatever is configured in previous step.
   • Send Serial data over TCP Socket connection. 
     • Should also receive serial data as well.
       
       
3. Sending Modbus RTU over TCP traffic #1:
   • Setup the COM port on the EndPoint device.
     • Set the Handler to Modbus Passthru
     • Set the BAUD and Parity as needed for device connected to it.
   • Configure the Modbus RTU over TCP port in the Modbus tab.
     • Default TCP port is 5021.
     • If the TCP port is changed, then you must reboot for the change to take affect.
   • To connect to the Modbus device:
     • From a host connected to the Gateway device via Ethernet cable.
       • Open a TCP Socket connection to IP address of the Endpoint Radio on TCP port 5021 or whatever is configured in previous step.
   • Send Serial data over TCP Socket connection. 
     
     • Should also receive serial data as well.
       
       
4. Sending Modbus RTU over TCP traffic #2:
   • Setup the COM port on the EndPoint device.
     • Set the Handler to Terminal Server
     • Set the BAUD and Parity as needed for device connected to it.
     • Set the TCP port as needed. 
       • The default is 5041 for COM#1 and 5042 for COM#2
       • If the TCP port is changed, then you must reboot for the change to take affect.
   • To connect to the Modbus device:
     • From a host connected to the Gateway device via Ethernet cable.
       • Open a TCP Socket connection to IP address of the Endpoint Radio on TCP port 5041 or whatever is configured in previous step.
   • Send Serial data over TCP Socket connection. 
     • Should also receive serial data as well.
       
       
5. Sending Generic Serial data:
   • Any of the above options will work.
   • Recommend using Modbus RTU over TCP traffic #2 in this setup.
   • NOTE:
     • Multiple TCP/IP Connections using Modbus RTU over TCP traffic #2 is not recommended.

 NOTE: Modbus RTU over TCP Step #1 is more reliable of the 2 options.

PDF Documents for Serial communication on ZumLink Series of radios: