All RS-485 channels support the local echo feature. The local echo can be turned on or off with the switches SW3 to SW6 found on the Four-port RS-485 module.
See the following diagram for the location of those switches on the board. The ON position is when the switch is aligned with its vertical marker (to the right).
IMPORTANT: When the Four-port RS-485 module is used to connect an TPL door controller to the Synergis™ unit, the local echo switch must be set to the ON position (to the right). When the Four-port RS- 485 module is used to connect the TCP/IP extension board to your PC, the local echo switch must be set to the OFF position (to the left).