Watlow EZwarePlus Programming - Manual (Page 77)

EZwarePlus Programming Manual 69
3. HMI work mode: Indicates the current mode of the HMI. After the communication parameters have
been received, the mode will be either Normal (HMI set to communicate with PLC) or Pass-through
(HMI is in pass-through mode).
4. Source COM Port (PC -> HMI): Set COM settings for the HMI COM port that will be connected to the
PC.
5. Destination COM Port (HMI -> PLC): Set COM settings for the HMI COM port that will be connected
to the PLC.
6. Click Start Pass-through to begin pass-through communication and Stop Pass-through to end. Click
Exit to exit pass-through mode.
 When the HMI is in serial pass-through mode, the HMI suspends communications with the PLC and
the application in the HMI does not run.

To use the Ethernet pass-through mode:
In the Ethernet pass-through mode, the HMI acts as an Ethernet-to-Serial bridge. A virtual COM port driver is
installed on the PC (in this example, COM3), which provides the connection between EZwarePlus (or the PLC
programming software) and the Ethernet port connected to the HMI. The virtual COM port uses the next
available port on the PC.
1010-1015, Rev. 03