NOVUS DigiGate Profibus - Manual (Page 5)

DigiGate Profibus
NOVUS AUTOMATION 5/11
OPERATION
Termination resistors
The Profibus and Modbus network buses are designed for using termination and/or polarization resistors (see Fig. 4). It
is recommended that the resistors be used when the device is installed at one of the bus ends and/or when it is used at a
high communication speed (higher than 115200 bps).
Fig. 4 – Device internal resistors (termination and polarization)
DigiGate is equipped internally with these resistors, being possible to activate them or not through jumpers (see Fig. 5).
Jumpers J1 and J3 (Modbus termination resistors) are on the right side, while jumpers J4, J5 and J6 (Profibus
termination resistors) are on the left side.
Looking at the product as in Fig. 5, an “open” jumper has always its strap in the higher position.
Fig. 5 – Localization of the jumpers in the device
Resistors come from the factory in disconnected position (jumpers open), both at the Profibus bus and at the Modbus
bus. Before manipulating them, be sure to power off the equipment.