INSTALLATION
Router Firewall IPL-E
User Guide 9021209-01
Page 27
RS422 isolated interface (IPL-E-260 or IPL-EW-260)
The RS422 interface is isolated.
When two devices or more are connected to the RS422 interface of the IPL router, the IPL router must be
the only device to transmit data on the TX+/TX- line towards all the other devices.
It means that the TX+/TX- line of the IPL router must be connected to the RX+/RX- of all the other devices of
the bus.
The polarisation and termination resistors can be selected with DIP switches.
The polarisation résistors must be enabled by one device of the bus.
The termination resistor must be enabled with SW3 & SW4 when the router is located at the extremity of the
bus.
Up to 16 devices can be connected to the bus.
We recommend to use a shielded cable and twisted pairs.
If the line is exposed to lightning, we recommend to protect the router with a surge arrester.
