ETT 771
BUILD-IN TOUCH TERMINAL
Page 20
15.07.2020
7.5
RS485
•
Because the RS485 requires a defined quiescent point, a pull-up and pull-down resistor
is required in addition to the termination resistor. The resistors are already implement-
ed in the device.
•
The 120 Ω terminating resistors must be placed at each bus end.
•
Star wiring should be avoided.