Technical data

55
W&T
Serial Fiber Optic Interfaces
Subject to error and alteration
Operating mode
The interface #65210 can be set for two different operating
modes by DIP switch setting on the RS485 interface module.
The selectable operating modes are briefly described here:
RS485 4 wire application, automatic control
One data channel in each direction is available.The RS485
output driver is activated automatically with each transmission
of data, and goes to the high impedance state again after the
end of transmission. The RS485 receiving channel is always
active in this operating mode.
RS485 2 wire application, automatic control
One data channel in each direction is available.The RS485
output driver is activated automatically with each transmission
of data, and goes to the high impedance state again after the
end of transmission. The RS485 receiving channel is deactiva-
ted when the driver is on, but is switched on when the driver is
in the high impedance state.
Please see the following table for an explanation of the
operating mode DIP switch:
Operating mode SW1 SW2 SW3 SW4 SW5
RS485, 4-wire bus systems OFF ON OFF ON OFF
RS485, 2-wire bus systems ON ON OFF ON OFF