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2-2. Module Description
2/99
2-3
U3-1021
Westinghouse Proprietary Class 2C
— RTS/ directly controls the state of the TX-ENA signal as shown below:
If two-wire half duplex communication is desired, connect the Link Controller’s
base unit terminal block input terminals to the output terminals (that is, connect
RX- to TX-, and connect RX+ to TX+). See Figure 2-5.
Caution
If the LC’s RS-485 output terminals are
connected to the RS-485 input terminals, the RS-
485 receiver is enabled whenever the applications
program enables the RS-485 transmitter. This
means that the RS-485 receiver can receive the
data being transmitted by the RS-485 transmitter.
The applications program must be able to handle
this situation.
Installing Personality Module into Base Unit
The Personality module (used to configure the Electronics module) fits into the base
unit beside the appropriate Electronics module. Note that the Personality module is
installed in the base unit first. Then, the Electronics module is installed and
interlocks with the Personality module. The blue corner latches on the Electronics
module secure both modules into the base unit.
The wires from the customer field devices are connected to the terminal block in the
base unit (see Figure 2-2).
The wiring connections to the terminal block for each combination of Electronics
module and Personality module are printed on each Personality module and are
illustrated in each module description in the following sections.
Note
Be sure that each wire opening in the terminal
block is fully open before inserting the wire.
This will ensure that the wire is clamped
securely when the screw is tightened.
MCR Bit 1
UART RTS/
Output State
TX-ENA State
RS-485 Transmitter
Output State
0
1
0
Tri-stated (disabled)
1
0
1
Enabled